CN107040921B - Short message encryption system based on point-to-point - Google Patents
Short message encryption system based on point-to-point Download PDFInfo
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- CN107040921B CN107040921B CN201710483146.XA CN201710483146A CN107040921B CN 107040921 B CN107040921 B CN 107040921B CN 201710483146 A CN201710483146 A CN 201710483146A CN 107040921 B CN107040921 B CN 107040921B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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Abstract
The invention provides a point-to-point-based short message encryption system, which comprises a short message encryption and decryption module and a ciphertext processing module; in the short message encryption and decryption module, the method comprises the following steps: a key negotiation stage, first ciphertext sending and subsequent ciphertext sending; in the key negotiation stage, both short message parties obtain corresponding public keys and generate own public key, private key pair and corresponding session keys; when the first ciphertext is sent, the first communication short message ciphertext consists of an encrypted session key and an encrypted short message; when the subsequent ciphertext is sent, only the encrypted short message is sent; and in the ciphertext processing module, splicing the decrypted short messages and verifying the integrity of the short messages. The invention is based on point-to-point communication, and only completes the end-to-end operation of the short message sender and the short message receiver without an intermediate third-party server, thereby having lower cost and further improving the safety of point-to-point short message communication; meanwhile, the transmission efficiency of the system is improved by dividing the communication period.
Description
Technical Field
The invention relates to the technical field of information security and mobile operating system software development, in particular to a short message point-to-point encryption and decryption method for a mobile terminal facing an Android system.
Background
Under the rapid development of communication technology, short message service has received attention from people. People often use short messages for business and life communication, such as: many merchants use short messages to deliver business secrets, and individual users send important private information such as bank cards and passwords in short messages. The short message brings convenience to daily life of people, improves efficiency, and brings corresponding potential safety hazards. Lawbreakers can acquire user information by monitoring short message data. Therefore, how to ensure the safety of the short message becomes a problem to be solved urgently.
Mayushu et al (Mayushu, Guo Yuyucui, Android system short message encryption design and implementation [ J ] software, 2016, (06): 79-82.) based on 3DES and RSA, propose to use 3DES and RSA mixed encryption algorithm to implement encryption processing of short messages after analyzing 3DES encryption algorithm and RSA encryption algorithm. Zhang Cheng Xiao et al (Zhang Cheng Xiao, Zhang hong, Liqian mu.) a short message encryption method [ J ] based on Android system computer technology and development, 2015, (09): 144-. Li Showa et al (Li Showa, King Yue Wu, Leiling light, Zhang Chinese, Android short message encryption scheme [ J ] based on dynamic key, graduate institute's institute of Chinese academy of sciences, 2013, (02): 272 and 277.) after discussing the short message pdu protocol and encrypting the short message protocol stack, the short message encryption based on dynamic key is proposed, and the seed distribution center is in contact with both short message receiving and sending parties through short messages to distribute and manage the initial seeds of the dynamic key.
Foreign researchers generally adopt a public key secret system to process the short message. In addition, channel encryption is also studied, for example, a wireless transmission channel is processed by relevant coding. Nanda et al (Ashok KumarNanda, prof. lalit Kumar awasthi. encryption Based Channel Coding [ a ].2011 world consistency on Information and Communication Technologies [ C ]. iee, 2011.) propose security measures for the secure transmission of Information Based on the NTRUSign digital signature scheme. In software encryption, PGP (mail encryption software based on RSA public key encryption system) written by phillips-quarterman is widely used. The PGP software can run on a plurality of platforms such as MS-DOS, Windows, Unix, Macintosh and the like. PGP also supports encryption and decryption with symmetric ciphers. The symmetric cipher can be used alone or combined with public key cipher to form mixed cipher system. The first end-to-end SMS encryption scheme in the world, Fortress SMS, was also developed and put into use by software house corporation in 2003. The short message encryption scheme adopts the Rijndael algorithm to perform related encryption and decryption operations on the short message, and separates the mobile service from other functions.
The existing short message encryption method generally passes through an intermediate third-party server, so that the cost is improved, the communication efficiency is reduced, and meanwhile, the further improvement of the short message communication safety is limited to a certain extent.
Disclosure of Invention
The technical problem to be solved by the invention is how to encrypt the short message without an intermediate third-party server, so as to reduce the cost, improve the communication efficiency and further improve the safety of short message communication.
In order to solve the technical problems, the technical scheme of the invention is to provide a point-to-point based short message encryption system, which is characterized in that: the system comprises a short message encryption and decryption module and a ciphertext processing module;
in the short message encryption and decryption module, the short message encryption and decryption module is executed in three stages, which are respectively as follows: a key negotiation stage, first ciphertext sending and subsequent ciphertext sending;
in the key negotiation stage, both short message parties obtain corresponding public keys and generate own public key, private key pair and corresponding session keys;
when the first ciphertext is sent, the first communication short message ciphertext consists of an encrypted session key and an encrypted short message; the encrypted short message is encrypted by the public key of the other party obtained in the key negotiation stage; after receiving the ciphertext information, the short message receiver firstly reads a key information table in the database to judge whether the ciphertext decryption operation is performed for the first time; if so, carrying out decryption operation on the ciphertext according to the splicing sequence;
when the subsequent ciphertext is sent, only the encrypted short message is sent; in the first ciphertext communication process, the session key of the opposite side is obtained and stored in the database, so that in the subsequent communication process, only the session key is used for encrypting the short message, and the opposite side only uses the same key to decrypt the ciphertext after receiving the short message ciphertext;
and in the ciphertext processing module, splicing the decrypted short messages and verifying the integrity of the short messages.
Preferably, when the first ciphertext is sent, after the short message receiver receives the ciphertext information, the private key information accessed in the database is read firstly, and the session key ciphertext is decrypted; and successfully decrypting to obtain the session key plaintext, updating the attribute value of the session key of the opposite side in the database, decrypting the short message plaintext by using the attribute value, and finally obtaining the plaintext information.
Preferably, in the first ciphertext transmission and the subsequent ciphertext transmission, the ciphertext is transmitted by adopting a packet distribution method, and the distribution processing of the long short message is completed by adding a header in front of each ciphertext fragment.
Preferably, in the ciphertext processing module, the integrity of the decrypted short message is verified according to the following rules: (1) the arriving short message firstly satisfies the short message entity which carries out the cryptograph communication at present; (2) the time interval between the corresponding group numbers needs to be smaller than a set threshold; (3) the number of receiving groups needs to be the same as the actual number of groups; (4) when multiple users and a certain user carry out ciphertext processing, verification processing is carried out according to the session id in the short message database.
Preferably, in the process of ciphertext splicing, if a packet loss phenomenon occurs, deleting the related ciphertext information in the database, sending an instruction for retransmitting the ciphertext to the short message sending party, and retransmitting the missing ciphertext short message by using a retransmission mechanism.
Preferably, if the time interval between the two parties of the ciphertext communication is smaller than a set specified difference, the two parties of the ciphertext communication are considered to be in the same period; otherwise, the two communications are not in the same period;
if the two parties are in the same period, the received public key of the other party is used for encrypting the session key in the process of transmitting the ciphertext for the first time, and meanwhile, the public key, the private key pair and the session key which are generated by the two parties do not need to be modified because the two parties are in the same period;
if the data is in different periods, that is, all the key information and the like in the previous period are invalid, in order to adapt to the processing of all the communications in the period, the key negotiation stage needs to be re-entered, new public key, private key pair and session key need to be re-generated, and the related information in the database needs to be updated
The short message encryption system provided by the invention is based on point-to-point communication, and only completes the end-to-end operation of a sender and a receiver of the short message without an intermediate third-party server, so that the cost is lower; the encryption and decryption part is subdivided into two parts of first encryption and decryption and subsequent encryption and decryption processing, so that the encryption strength of the short message is improved, and the point-to-point short message communication safety is further improved; meanwhile, the transmission efficiency of the system is improved by dividing the communication period.
Drawings
Fig. 1 is a single-cycle communication flow chart of a point-to-point-based short message encryption system according to this embodiment;
fig. 2 is a flowchart of a multi-cycle communication of the short message encryption system based on peer-to-peer in this embodiment.
FIG. 3 is a first encryption flow diagram;
fig. 4 is a first decryption flow chart.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
The point-to-point based short message encryption system provided by the embodiment mainly comprises two modules: the short message encryption and decryption module and the ciphertext processing module. The short message encryption and decryption module is mainly divided into three parts for processing short messages, and comprises the following steps: and negotiating a key, an encryption and decryption process and a communication period. The ciphertext processing module mainly comprises the following parts: grouping distribution of ciphertext, retransmission mechanism and splicing check.
The method comprises the following specific steps:
first, short message encryption and decryption module
The short message encryption and decryption module is responsible for encryption and decryption processing of the whole short message. The following three parts are the key points for realizing the encryption and decryption of the short message.
1. And a key negotiation stage: the method mainly aims to obtain corresponding public keys by both short message parties and generate own public keys, private key pairs and corresponding session keys.
2. Encryption and decryption processing: the method comprises two parts of first encryption and decryption processing and subsequent encryption and decryption processing. At the stage of the first encryption and decryption processing, the session key of the opposite party is mainly obtained and stored in the database of the opposite party, and meanwhile, the corresponding key information table is updated, so that the next encryption and decryption processing is facilitated. In the subsequent encryption and decryption process, the key information table in the corresponding database needs to be read, and the key of the opposite party session is acquired from the key information table to complete the encryption and decryption process operation.
3. Communication cycle: in the process of transmitting related short messages between two short message parties, if a new session key is generated each time, the transmission efficiency and the user experience are reduced, and a problem exists at this time: whether the first received session public key can be used for sending the subsequent short message within a period of time or not is used, so that the running efficiency of the whole software is improved. In light of the above problems, the present invention proposes the concept of communication cycle.
Ciphertext processing module
Because a short message sending party may send a plurality of ciphertext short messages in a period of time, each ciphertext short message is divided into a plurality of ciphertext short messages to be sent due to long length, but for a receiving party, ciphertext fragments are lost due to transmission delay or poor signals, and the like, how to check the integrity of the ciphertext and how to sequentially splice a plurality of groups of ciphertexts is also an urgent problem to be processed and solved.
Third, based on the point-to-point short message encryption system communication flow
As shown in fig. 1, the single-cycle communication based on the point-to-point short message encryption system is executed in several stages, including: a key negotiation stage, a first ciphertext transmission and a subsequent ciphertext transmission. In ciphertext communication, namely, in the first ciphertext transmission and the subsequent ciphertext transmission, because the ciphertext length is long, the ciphertext is often required to be transmitted in multiple groups, and therefore, a packet distribution part shown in 4 in fig. 1 appears.
In the key negotiation stage, the acquisition of the public key information of both short message communication parties is mainly completed. At this stage, as the ciphertext communication between the two parties is to be realized, both parties need to generate their own public key and private key pair, that is, the part is mainly realized for the asymmetric cryptographic system, and here, the RSA algorithm is used to generate the information related to the short message public key. On the other hand, because both sides need to generate own session keys at the same time, the session keys are used for encrypting own short message plain texts, namely, the part is mainly realized by falling to the ground by an AES algorithm.
When the first ciphertext is transmitted, the encryption and decryption methods are shown in fig. 3 and 4, fig. 3 is a flowchart of the encryption of the first ciphertext, and fig. 4 is a flowchart of the decryption of the first ciphertext. As can be seen from fig. 3, the first-time communication text message ciphertext consists of two parts, namely, the encrypted session key and the encrypted text message. The encrypted short message is mainly encrypted by the public key of the opposite side obtained in the key negotiation stage, and the encryption part of the session key is mainly realized by an AES algorithm. Fig. 4 shows the decryption process of the received short message, when the short message receiver receives the ciphertext message, it first reads the key information table in the database to determine whether the ciphertext decryption operation is performed for the first time, if so, the ciphertext is split according to the splicing sequence. The invention firstly reads the private key information accessed in the database, decrypts the session key ciphertext, obtains the session key plaintext after successful decryption, updates the attribute value of the session key of the opposite side in the database, and decrypts the short message plaintext by using the attribute value, and finally obtains the plaintext information.
In the subsequent ciphertext sending process, the ciphertext format is changed correspondingly, the two parts are not spliced, and only the ciphertext of the short message is sent. In the first ciphertext communication process, the session key of the opposite side is obtained and stored in the database, so that the subsequent communication process simplifies the encryption and decryption of the short message, the session key is only used as the key of the AES algorithm to encrypt the short message, and the opposite side decrypts the ciphertext by only using the same key after receiving the ciphertext of the short message. The communication process at this time is actually simplified to processing the short message by using a symmetric cryptographic algorithm. The improvement process makes better use of the characteristics of high speed and high safety of the symmetric cryptosystem.
A packet distribution mechanism: in general, the length of the plaintext of the short message is increased after the encryption of the communication, and if the plaintext of the short message is encrypted for the first time, the length of the short message may be longer because two parts need to be spliced. Therefore, the probability that a common short message is sent out in a short message form with less characters is smaller, and therefore, the short message is often sent in groups.
The packet transmission of the ciphertext mainly adopts a mode of adding a header in front of each ciphertext fragment to complete the distribution processing of the long short message. How to guarantee the integrity of the ciphertext is also an important problem to be considered for the short message receiving party. The verification of the integrity of the ciphertext needs to meet the following rules: (1) the first requirement of the arriving short message is the short message entity which carries out the cryptograph communication at present. (2) The time interval between the respective numbers of groups needs to be less than a set threshold. (3) Receive the group number as the actual group number. (4) When multiple users and a certain user carry out ciphertext processing, the verification is mainly carried out according to the session id in the short message database.
In the process of ciphertext splicing, packet loss may occur due to the line problem. The strategy adopted by the invention is to delete the related ciphertext information in the database, send a command of retransmitting the ciphertext to the short message sending party, and retransmit the missing ciphertext short message by using a retransmission mechanism.
Fig. 2 is a multi-cycle cryptograph communication process, and compared with the single-cycle communication of fig. 1, fig. 2 proposes the concept of communication cycle on the basis of fig. 1. The communication cycle refers to a time interval between two parties of ciphertext communication which have communicated for a certain period of time recently, and if the time interval is smaller than a set specified difference, the communication is considered to be in the same cycle. If the time interval is larger than the set specified difference, the two communications are not in the same period. If the session key is in the same period, the received public key of the opposite side is used for encrypting the session key in the process of transmitting the ciphertext for the first time. Meanwhile, because the two communication parties are in the same period, the public key, the private key pair and the session key generated by the two communication parties do not need to be modified. If all the key information and the like in different periods, i.e. the previous period, have been invalidated, in order to adapt to the processing of all the communications in this period, it is necessary to re-enter the key agreement stage, re-generate a series of key information such as new related key pairs, session keys and the like, and update the related information in the database.
The invention adopts the short message point-to-point encryption and decryption method of the hybrid cryptographic algorithm and the symmetric cryptographic algorithm, thereby ensuring the point-to-point short message communication safety. Meanwhile, the invention also provides a friendly user interface and is convenient to use.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (5)
1. A short message encryption system based on point-to-point is characterized in that: the system comprises a short message encryption and decryption module and a ciphertext processing module;
in the short message encryption and decryption module, the short message encryption and decryption module is executed in three stages, which are respectively as follows: a key negotiation stage, first ciphertext sending and subsequent ciphertext sending;
in the key negotiation stage, both short message parties obtain corresponding public keys and generate own public key, private key pair and corresponding session keys;
when the first ciphertext is sent, the first communication short message ciphertext consists of an encrypted session key and an encrypted short message; the encrypted short message is encrypted by a session key obtained in a key negotiation stage; after receiving the ciphertext information, the short message receiver firstly reads a key information table in the database to judge whether the ciphertext decryption operation is performed for the first time; if so, carrying out decryption operation on the ciphertext according to the splicing sequence;
when the subsequent ciphertext is sent, only the encrypted short message is sent; in the first ciphertext communication process, the session key of the opposite side is obtained and stored in the database, so that in the subsequent communication process, only the session key is used for encrypting the short message, and the opposite side only uses the same key to decrypt the ciphertext after receiving the short message ciphertext;
in the ciphertext processing module, the decrypted short messages are spliced and the integrity of the short messages is verified;
when the first ciphertext is sent, after a short message receiving party receives ciphertext information, firstly, reading the private key information accessed in the database, and decrypting the session key ciphertext; and successfully decrypting to obtain the session key plaintext, updating the attribute value of the session key of the opposite side in the database, decrypting the short message plaintext by using the attribute value, and finally obtaining the plaintext information.
2. The point-to-point based short message encryption system as claimed in claim 1, wherein: in the first ciphertext sending and the subsequent ciphertext sending, the ciphertext is sent by adopting a grouping distribution method, and the distribution processing of the long short message is completed by adding a header in front of each ciphertext fragment.
3. The point-to-point based short message encryption system as claimed in claim 2, wherein: in the ciphertext processing module, the integrity of the decrypted short message is verified through the following rules: (1) the arriving short message firstly satisfies the short message entity which carries out the cryptograph communication at present; (2) the time interval between the corresponding group numbers needs to be smaller than a set threshold; (3) the number of receiving groups needs to be the same as the actual number of groups; (4) when multiple users and a certain user carry out ciphertext processing, verification processing is carried out according to the session id in the short message database.
4. The point-to-point based short message encryption system as claimed in claim 2, wherein: in the process of ciphertext splicing, if a packet loss phenomenon occurs, deleting related ciphertext information in the database, sending a command of retransmitting the ciphertext to a short message sending party, and retransmitting the missing ciphertext short message by using a retransmission mechanism.
5. The point-to-point based short message encryption system as claimed in claim 1, wherein: if the time interval of the communication between the two parties of the ciphertext communication is smaller than the set specified difference, the communication is considered to be in the same period; otherwise, the two communications are not in the same period;
if the two parties are in the same period, the received public key of the other party is used for encrypting the session key in the process of transmitting the ciphertext for the first time, and meanwhile, the public key, the private key pair and the session key which are generated by the two parties do not need to be modified because the two parties are in the same period;
if the data is in different periods, that is, all the key information and the like in the previous period are invalid, in order to adapt to the processing of all the communications in the period, the key negotiation stage needs to be re-entered, new public keys, private key pairs and session keys need to be re-generated, and relevant information in the database needs to be updated.
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