CN202978979U - Password security keypad device and password security pad system - Google Patents
Password security keypad device and password security pad system Download PDFInfo
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- CN202978979U CN202978979U CN 201220688994 CN201220688994U CN202978979U CN 202978979 U CN202978979 U CN 202978979U CN 201220688994 CN201220688994 CN 201220688994 CN 201220688994 U CN201220688994 U CN 201220688994U CN 202978979 U CN202978979 U CN 202978979U
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Abstract
The utility model relates to a password security keypad device and a password security keypad system. The device comprises a central processing unit, a communication encryption/decryption chip, a liquid crystal display, a key set, a loudspeaker, a memory and an encoding chip, wherein the communication encryption/decryption chip, the liquid crystal display, the key set, the loudspeaker, the memory and the encoding chip are connected with the central processing unit. The communication encryption/decryption chip is used for receiving password input request information and encrypted online transaction processing verification codes and decrypting the encrypted online transaction processing verification codes. The liquid crystal display is used for displaying prompt information and information inputted by a user. The key set is used for receiving information including user passwords and password confirmation information and inputted by the user. The loudspeaker is used for playing voice information. The memory is used for saving the password input request information, the online transaction processing verification codes, the prompt information and the information including the user passwords and inputted by the user. The encoding chip is used for splicing or merging the user passwords and the verification codes to generate a password string. Therefore, password and cipher text secure transmission between a password keypad and a background processing system is achieved.
Description
Technical field
The utility model relates to the Security Data Transmission technical field, and particularly code keypad and utilize code keypad to carry out the technology of Transaction Processing, be a kind of cryptosecurity key board unit and system specifically.
Background technology
In daily life, often need the identifying user identities such as user's password, so that according to this user identity and authority, carry out subsequent transaction.For example, in gate control system, may need the user to input user cipher by code keypad, be used for the online validation user identity, and carry out subsequent treatment according to the result.In addition, increasing people selects bankcard consumption, in the bankcard consumption process, also needs the user to input user cipher by code keypad, thus identifying user identity, and carry out accordingly follow-up Transaction Processing.
In the prior art, use cipher mode to carry out the user cipher transmission between code keypad and background processing system.Yet the cryptographic attack person might intercept the user cipher message transmission in whole transmission channel.For example, when the user uses gate control system, according to the normal running flow process, input user cipher by code keypad, and be committed to background processing system, background processing system is identified user identity according to user cipher, judge this user right, allow accordingly the user to enter or refusing user's enters.In code keypad and background processing system communication process, the assailant may intercept the cipher text that the user inputs, and meanwhile, user this time transaction still can normally carry out, in the unwitting situation of user, the assailant has kept a user cipher message like this.Although the user cipher message is ciphertext, the assailant possibly can't be known user cipher expressly, but still can be after the user leaves, by retransmitting the mode of user cipher message, the forgery user's business is processed, and this forgery user profile of backstage treatment system None-identified, this will threaten to system safety.
Therefore, although user cipher is the ciphertext transmission between code keypad and background processing system, the assailant can't effectively identify the original user password, but still can directly utilize the user cipher ciphertext, retransmit this user cipher ciphertext under improper authorization conditions, the forgery user's business is processed, and threatens whole system safety.
The utility model content
The utility model provides a kind of cryptosecurity key board unit and system, to solve the safe transmission problem of password ciphertext between code keypad and background processing system.
One of the purpose of this utility model is, a kind of cryptosecurity key board unit is provided, this cryptosecurity key board unit comprises: central processing unit, and be connected with central processing unit, communication enciphering/deciphering chip, be used for receiving the outside Password Input solicited message of sending and the Transaction Processing identifying code of encryption, the Transaction Processing identifying code of encrypting is decrypted; Liquid crystal display screen is used for showing the information of Transaction Processing process and the information of user's input; Key groups, what be used for to receive user's input comprises user cipher and password confirming information in interior information; Loud speaker is for the voice messaging of playing the Transaction Processing process; Memory, what be used for storage Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information; Coding chip is used for user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string; Communication enciphering/deciphering chip also is used for password string is encrypted processing, generates the encrypted result ciphertext, and sends encrypted result ciphertext and password confirming information to the outside.
Coding chip also is used for user cipher and the local Transaction Processing identifying code that generates are spliced or merge processing generating cipher string.
The cryptosecurity key board unit also comprises: USB interface, USB interface are connected with communication enciphering/deciphering chip with central processing unit respectively.
One of the purpose of this utility model is, a kind of cryptosecurity keyboard system is provided, and this cryptosecurity keyboard system comprises: core business processing server, front station terminal and cryptosecurity key board unit; The core business processing server is connected with front station terminal by internal network, and front station terminal is connected with the cryptosecurity key board unit by serial ports; The core business processing server is used for generating the Transaction Processing identifying code, and station terminal sends the Transaction Processing identifying code of encrypting forward, and receives the encrypted result ciphertext of foreground terminal feedback; Front station terminal, the Transaction Processing identifying code that is used for the encryption that will receive is transmitted to the cryptosecurity key board unit, and the encrypted result ciphertext that the cryptosecurity key board unit is sent is transmitted to described core business processing server; The cryptosecurity key board unit comprises: central processing unit, and be connected with central processing unit, communication enciphering/deciphering chip, the Password Input solicited message that before being used for receiving, station terminal is sent and the Transaction Processing identifying code of encryption are decrypted the Transaction Processing identifying code of encrypting; Liquid crystal display screen is used for showing the information of Transaction Processing process and the information of user's input; Key groups, what be used for to receive user's input comprises user cipher and password confirming information in interior information; Loud speaker is for the voice messaging of playing the Transaction Processing process; Memory, what be used for storage Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information; Coding chip is used for user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string; Communication enciphering/deciphering chip also is used for password string is encrypted processing, generate the encrypted result ciphertext, and station terminal sends encrypted result ciphertext and password confirming information forward.
The beneficial effects of the utility model are: by code keypad and system's Transaction Processing flow process; the any user cipher input of unique identification; user cipher and this time Transaction Processing identifying code are bound and encrypted; guarantee that the user inputs password and only is used for this time Transaction Processing; prevent that effectively the assailant from intercepting user cipher and forging user's Transaction Processing, protection user cipher and user identity safety.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of the cryptosecurity key board unit of the utility model embodiment;
Fig. 2 is the annexation schematic diagram of the cryptosecurity keyboard system of the utility model embodiment;
Fig. 3 is the business processing flow figure of the cryptosecurity keyboard system of the utility model embodiment;
Fig. 4 is that flow chart is confirmed in the cryptosecurity keyboard system Transaction Processing request of the utility model embodiment;
Fig. 5 is the cryptosecurity keyboard system code keypad process chart of the utility model embodiment;
Fig. 6 is the cryptosecurity keyboard Transaction Processing flow chart of the utility model embodiment;
Fig. 7 is the cryptosecurity keyboard process chart of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the cryptosecurity key board unit of the present embodiment comprises: central processing unit 101, and be connected with central processing unit 101, communication enciphering/deciphering chip 102, be used for receiving the outside Password Input solicited message of sending and the Transaction Processing identifying code of encryption, the Transaction Processing identifying code of encrypting is decrypted; Liquid crystal display screen 103 is used for showing the information of Transaction Processing process and the information of user's input; Key groups 104, what be used for to receive user's input comprises user cipher and password confirming information in interior information, and key groups 104 is connected with central processing unit 101 by key scanning circuit 109; Loud speaker 105 is for the voice messaging of playing the Transaction Processing process; Memory 106, what be used for storage Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information; Coding chip 107 is used for user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string; Communication enciphering/deciphering chip 102 also is used for password string is encrypted processing, generates the encrypted result ciphertext, and sends encrypted result ciphertext and password confirming information to the outside; Power supply 110 is used for providing working power.
The cryptosecurity key board unit also comprises: usb 1 08, usb 1 08 are connected with communication enciphering/deciphering chip 102 with central processing unit 101 respectively.
Liquid crystal display screen is connected with CPU by data/address bus, and key groups is carried out serial ports by key scanning circuit with CPU and is connected.Backlight and the interface of liquid crystal display screen all adopts the liquid crystal circuit design of industrywide standard to obtain light source.Liquid crystal display screen is completed the function that information shows.
CPU is used for receiving the instruction from host computer, receives the key command that scans from key scanning circuit and then by the liquid crystal display screen circuit that is attached thereto, input is presented in the input frame of liquid crystal display screen.CPU adopts the 89c52 chip of industrywide standard, the serial ports of its middle port [RXD, TXD] for supporting.
Key scanning circuit also adopts the industry circuit of standard, is connected with CPU by 2 road serial ports, and the connectivity port is the 32nd, 33 road port RXD, TXD.Key groups is by [KEYIN0:KEYIN3], [KEYOUT0:KEYOUT2] is connected with the corresponding ports of key scanning circuit, 12 circuit form 12 nodes and represent 12 buttons, when any one button is pressed, key scanning circuit all can be recorded to this button, and it is shown on liquid crystal display screen by CPU.Key groups and key scanning circuit are completed the function of Password Input.
Loud speaker is play voice suggestion, memory stores information, coding chip carry out that data encoding, communication deciphering chip carry out that data encryption, USB interface are connected with host computer and power supply for working power is provided.
As shown in Figure 2, this cryptosecurity keyboard system of the cryptosecurity keyboard system of the present embodiment comprises: core business processing server 300, front station terminal 200 and cryptosecurity key board unit 100; Core business processing server 300 is connected with front station terminal 200 by internal network, and front station terminal 200 is connected with cryptosecurity key board unit 100 by serial ports; Core business processing server 300 is used for generation Transaction Processing identifying code, and station terminal 200 sends the Transaction Processing identifying code of encrypting forward, and the encrypted result ciphertext that before receiving, station terminal 200 feeds back; Front station terminal 200, the Transaction Processing identifying code that is used for the encryption that will receive is transmitted to cryptosecurity key board unit 100, and the encrypted result ciphertext that cryptosecurity key board unit 100 is sent is transmitted to core business processing server 300; Cryptosecurity key board unit 100 comprises: data receiver unit, the Password Input solicited message that before being used for receiving, station terminal 200 is sent and the Transaction Processing identifying code of encryption; Decrypting device is used for the Transaction Processing identifying code of encrypting is decrypted; Information display unit is used for showing the information of Transaction Processing process and the information of user's input; The Password Input unit, what be used for to receive user's input comprises user cipher and password confirming information in interior information; The speech play unit is for the voice messaging of playing the Transaction Processing process; Data storage cell, what be used for storing described Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information; Coding unit is used for user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string; Ciphering unit is used for password string is encrypted processing, generates the encrypted result ciphertext; Data transmission unit, being used for forward, station terminal 200 sends encrypted result ciphertext and password confirming information.
core business processing server 300 is responsible for receiving the system's Transaction Processing request that is sent by front station terminal 200, generate the Transaction Processing identifying code, use and existing this Transaction Processing identifying code of secret key encryption of cryptosecurity key board unit 100, return to Transaction Processing confirmation and Transaction Processing identifying code ciphertext, use and the existing secret key decryption user cipher of cryptosecurity key board unit 100 and Transaction Processing identifying code, verification Transaction Processing identifying code, the verified users password, carry out system's Transaction Processing and account operation, and return to the Transaction Processing object information.
Wherein the Transaction Processing identifying code has uniqueness in whole system, and any one Transaction Processing identifying code only uses once, this Transaction Processing of unique sign, not reproducible use.The Transaction Processing identifying code can be the random number that is generated by core business processing server 300; The timestamp that is perhaps generated by core business processing server 300; Perhaps use Unified Algorithm, synchronous generation respectively in core business processing server 300 and cryptosecurity key board unit 100, but be not limited only to this.
Code keypad 3 is user cipher input terminals, user cipher input request and Transaction Processing identifying code that before being responsible for receiving, station terminal 200 sends, use and the existing secret key decryption Transaction Processing of core business processing server 300 identifying code, the prompting user inputs user cipher, receive the user cipher of user's input, use and the existing secret key encryption user cipher of core business processing server 300 and Transaction Processing identifying code, station terminal 200 returns to user cipher and Transaction Processing identifying code ciphertext forward.Further, cryptosecurity key board unit 100 can use the verification code generation method same with core business processing server 300, generates identifying code in this locality.
Cryptosecurity key board unit 100 is user cipher input terminals, user cipher input request and Transaction Processing identifying code that before being responsible for receiving, station terminal 200 sends, use and the existing secret key decryption Transaction Processing of core business processing server 300 identifying code, the prompting user inputs user cipher, receive the user cipher of user's input, use and the existing secret key encryption user cipher of core business processing server 300 and Transaction Processing identifying code, station terminal 200 returns to user cipher and Transaction Processing identifying code ciphertext forward.Further, cryptosecurity key board unit 100 can use the verification code generation method same with core business processing server 300, generates identifying code in this locality.
Liquid crystal display is used for showing the prompting of Transaction Processing process, checks that for the user also assisted user is completed Transaction Processing.Liquid crystal display can show text prompt information such as comprising " please input password ", shows that the user inputs password (showing with asterisk " * "), shows the information such as the Transaction Processing amount of money.
Voice alerting unit is used for carrying out the prompting of Transaction Processing process by voice to the user, each operating procedure of prompting user.Voice alerting unit can be with the voice suggestion voice suggestion such as " please input password ".
Memory cell is used for the information of storage Transaction Processing process.Can store the Transaction Processing identifying code that comprises in the Password Input request that front station terminal 200 sends, the user cipher of storage user input, the information such as the relevant amount of money of storage Transaction Processing.
Coding unit is used for user cipher and Transaction Processing identifying code are spliced or merge processing.Coding unit can directly be connected user cipher and Transaction Processing identifying code as password string to be encrypted, perhaps user cipher and Transaction Processing identifying code are carried out the Hash processing as password string to be encrypted, carry out accordingly Transaction Processing and password authentification for core business processing server 300.
Encryption/decryption element is used for the encryption and decryption message transmission.Encryption/decryption element uses DES or 3-DES cryptographic algorithm.Encryption/decryption element uses the Transaction Processing identifying code in the Password Input request message that existing key sends front station terminal 200 to be decrypted, obtain the Transaction Processing identifying code expressly, expressly be kept in memory cell the Transaction Processing identifying code stand-by.Encryption/decryption element uses existing key that the password string to be encrypted that user cipher and Transaction Processing identifying code combine is encrypted, this encrypted result ciphertext replying as the Password Input request, return to front station terminal 200, treat that core business processing server 300 carries out Transaction Processing and user cipher checking according to this encrypted result ciphertext.
As shown in Figure 3, the step of the Transaction Processing flow process of the present embodiment is as follows:
Step 303, core business processing server 300 is confirmed the Transaction Processing request.Core business processing server 300 is confirmed whether to continue to process this Transaction Processing according to the Transaction Processing information that receives.If continue execution in step 304; If not, the refusal Transaction Processing, station terminal 200 returns to refusal Transaction Processing information forward.
So far, Transaction Processing finishes.
As shown in Figure 4, flow process is confirmed in the Transaction Processing request of above-mentioned steps 303, mainly comprises the following steps:
As shown in Figure 5, the code keypad handling process of above-mentioned steps 307 mainly comprises the following steps:
In core business processing server 300, be provided with the identifying code generation unit, be used for generating the Transaction Processing identifying code, for core business processing server 300 these Transaction Processing of checking.The identifying code generation unit is according to default create-rule, synchronize with core business processing server 300 and generate the Transaction Processing identifying code, this time of unique identification Transaction Processing when this Transaction Processing identifying code can be used for cryptosecurity key board unit 100 with core business processing server 300 online transaction, and do not need to issue this Transaction Processing identifying code by core business processing server 300, so the Transaction Processing process between cryptosecurity key board unit 100 and core business processing server 300 can be completed by an online transaction.The identifying code generting machanism of identifying code generation unit and the identifying code generting machanism of core business processing server 300 are identical, and synchronously generate the online transaction identifying code, guarantee that the identifying code generation unit is consistent with the Transaction Processing identifying code that core business processing server 300 generates.The identifying code generation unit can generate random number as the Transaction Processing identifying code according to default create-rule, or according to relevant information generating code strings such as current exchange hour, online transaction information, code keypad information as the Transaction Processing identifying code.For example, the identifying code generation unit can with current Transaction Processing time, online transaction operation specifying information (as Transaction Processing account account, the Transaction Processing amount of money), code keypad sign, Transaction Processing type number as input message, generate the Transaction Processing identifying code by hash algorithm.Core business processing server 300 is after receiving the Transaction Processing request, can be according to the Transaction Processing time that comprises in the Transaction Processing request, online transaction operation specifying information (as Transaction Processing account account, the Transaction Processing amount of money etc.), code keypad sign, Transaction Processing type number, generate the mutual processing identifying code identical with the identifying code generation unit by identical hash algorithm, with legitimacy and the authenticity of verifying this Transaction Processing.
As shown in Figure 6, the Transaction Processing flow process of cryptosecurity key board unit 100 embodiment comprises the following steps:
So far, Transaction Processing finishes.
Flow chart is as shown in Figure 7 described the code keypad handling process of above-mentioned steps 704 in detail, mainly comprises the following steps:
Step 804 also can arrange the identifying code generation unit in cryptosecurity key board unit 100, generates the Transaction Processing identifying code with the generating cipher keyboard.Cryptosecurity key board unit 100 is used for this Transaction Processing of unique identification by self identifying code generation unit generation Transaction Processing identifying code.
The beneficial effects of the utility model are: by code keypad and system's Transaction Processing flow process; the any user cipher input of unique identification; user cipher and this time Transaction Processing identifying code are bound and encrypted; guarantee that the user inputs password and only is used for this time Transaction Processing; prevent that effectively the assailant from intercepting user cipher and forging user's Transaction Processing, protection user cipher and user identity safety.
Used specific embodiment in the utility model principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. a cryptosecurity key board unit, is characterized in that, described cryptosecurity key board unit comprises: central processing unit, and be connected with described central processing unit,
Communication enciphering/deciphering chip is used for receiving the outside Password Input solicited message of sending and the Transaction Processing identifying code of encryption, and the Transaction Processing identifying code of described encryption is decrypted;
Liquid crystal display screen is used for showing the information of Transaction Processing process and the information of user's input;
Key groups, what be used for to receive user's input comprises user cipher and password confirming information in interior information;
Loud speaker is for the voice messaging of playing the Transaction Processing process;
Memory, what be used for storing described Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information;
Coding chip is used for described user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string;
Described communication enciphering/deciphering chip also is used for described password string is encrypted processing, generates the encrypted result ciphertext, and sends described encrypted result ciphertext and password confirming information to the outside.
2. cryptosecurity key board unit as claimed in claim 1, is characterized in that, described coding chip is used for described user cipher and the local Transaction Processing identifying code that generates are spliced or merge processing generating cipher string.
3. cryptosecurity key board unit as claimed in claim 1, is characterized in that, described cryptosecurity key board unit also comprises: USB interface, described USB interface are connected with described communication enciphering/deciphering chip with described central processing unit respectively.
4. a cryptosecurity keyboard system, is characterized in that, described cryptosecurity keyboard system comprises: core business processing server, front station terminal and cryptosecurity key board unit;
Described core business processing server is connected with described front station terminal by internal network, and described front station terminal is connected with described cryptosecurity key board unit by serial ports;
Described core business processing server is used for generating the Transaction Processing identifying code, sends to described front station terminal the Transaction Processing identifying code of encrypting, and receives the encrypted result ciphertext of described foreground terminal feedback;
Described front station terminal, the Transaction Processing identifying code that is used for the encryption that will receive is transmitted to described cryptosecurity key board unit, and the described encrypted result ciphertext that described cryptosecurity key board unit is sent is transmitted to described core business processing server;
Described cryptosecurity key board unit comprises: central processing unit, and be connected with described central processing unit, communication enciphering/deciphering chip, be used for receiving Password Input solicited message that described front station terminal sends and the Transaction Processing identifying code of encryption, the Transaction Processing identifying code of described encryption is decrypted; Liquid crystal display screen is used for showing the information of Transaction Processing process and the information of user's input; Key groups, what be used for to receive user's input comprises user cipher and password confirming information in interior information; Loud speaker is for the voice messaging of playing the Transaction Processing process; Memory, what be used for storing described Password Input solicited message, Transaction Processing identifying code, information and user's input comprises user cipher in interior information; Coding chip is used for described user cipher and Transaction Processing identifying code are spliced or merge processing generating cipher string; Described communication enciphering/deciphering chip also is used for described password string is encrypted processing, generates the encrypted result ciphertext, and sends described encrypted result ciphertext and password confirming information to described front station terminal.
5. cryptosecurity keyboard system as claimed in claim 4, is characterized in that, described coding chip is used for described user cipher and the local Transaction Processing identifying code that generates are spliced or merge processing generating cipher string.
6. cryptosecurity keyboard system as claimed in claim 4, is characterized in that, described cryptosecurity key board unit also comprises: USB interface, described USB interface are connected with described communication enciphering/deciphering chip with described central processing unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688994 CN202978979U (en) | 2012-12-13 | 2012-12-13 | Password security keypad device and password security pad system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688994 CN202978979U (en) | 2012-12-13 | 2012-12-13 | Password security keypad device and password security pad system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978979U true CN202978979U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220688994 Expired - Lifetime CN202978979U (en) | 2012-12-13 | 2012-12-13 | Password security keypad device and password security pad system |
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| CN (1) | CN202978979U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108334794A (en) * | 2017-12-28 | 2018-07-27 | 天地融科技股份有限公司 | A kind of information input encryption method and system for information input equipment |
| CN108932441A (en) * | 2017-05-26 | 2018-12-04 | 三星Sds株式会社 | The operation method and computing device of safety keyboard system, safety keyboard |
| CN109508566A (en) * | 2018-12-29 | 2019-03-22 | 上海哈诚电子科技有限公司 | A kind of safety device of code keyboard |
-
2012
- 2012-12-13 CN CN 201220688994 patent/CN202978979U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108932441A (en) * | 2017-05-26 | 2018-12-04 | 三星Sds株式会社 | The operation method and computing device of safety keyboard system, safety keyboard |
| CN108334794A (en) * | 2017-12-28 | 2018-07-27 | 天地融科技股份有限公司 | A kind of information input encryption method and system for information input equipment |
| CN108334794B (en) * | 2017-12-28 | 2021-10-22 | 天地融科技股份有限公司 | Information input encryption method and system for information input equipment |
| CN109508566A (en) * | 2018-12-29 | 2019-03-22 | 上海哈诚电子科技有限公司 | A kind of safety device of code keyboard |
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Granted publication date: 20130605 |