CN108270545A - A kind of improved DES data encryption algorithm based on mobile Internet - Google Patents
A kind of improved DES data encryption algorithm based on mobile Internet Download PDFInfo
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- CN108270545A CN108270545A CN201611254493.7A CN201611254493A CN108270545A CN 108270545 A CN108270545 A CN 108270545A CN 201611254493 A CN201611254493 A CN 201611254493A CN 108270545 A CN108270545 A CN 108270545A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
- H04L9/0625—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation with splitting of the data block into left and right halves, e.g. Feistel based algorithms, DES, FEAL, IDEA or KASUMI
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Abstract
The present invention provides a kind of improved DES data encryption algorithm based on mobile Internet, which includes step S1：The plaintext of 64 bits is from left to right represented sequentially as m1,m2,…,m64；Step S2：By the plaintext m of 64 bits1,m2,…,m64Carry out initial permutation；Step S3：By the plaintext after displacement in the presence of chaotic key, the interative computation of 16 wheels is carried out；Step S4：Plaintext after interative computation is subjected to last displacement；Step S5：The plaintext of 64 bits after the last displacement of progress is represented sequentially as c1,c2,...,c64.Compared with prior art：The present invention provides a kind of improved DES data encryption algorithm based on mobile Internet to have superior sensibility and good randomness；The improved des encryption algorithm for encryption speed of the present invention is faster, more efficient, safety is more preferable；The combination chaotic maps of the present invention and the data encryption system of des encryption algorithm, play a protective role, and prevent leakage of data or under attack for the data transmission in mobile Internet, improve the safety of data.
Description
Technical field
The present invention relates to the field of data encryption in information security, and in particular to a kind of based on the improved of mobile Internet
DES data encryption algorithm.
Background technology
With flourishing for development of Mobile Internet technology and its application, the prevalence of social networks technology, using smart mobile phone as
The quick of main individual digital portable equipment is popularized, and people can be more convenient, various information are quickly obtained from network, thus
The data volume brought just is increased with exponential form, wherein being much private information related to user, even relates to enterprise and state
The safety secret of family, can inevitably attract the various artificial attacks from all over the world.Therefore in the data transmission of mobile Internet
In the process, user it is necessary to transmit again after significant data is encrypted, to ensure the safety of storage data.Traditional encryption
Technology can not fast and effeciently protection information safety, and sensibility and randomness are poor, and efficiency is low, and safety cannot be protected
Barrier.
In view of drawbacks described above, creator of the present invention obtains the present invention finally by prolonged research and practice.
Invention content
To solve above-mentioned technological deficiency, the technical solution adopted by the present invention is, provides a kind of based on mobile Internet
Improved DES data encryption algorithm, includes the following steps：
Step S1：The plaintext of 64 bits is from left to right represented sequentially as m1,m2,...,m64；
Step S2：By the plaintext m of 64 bits1,m2,...,m64Carry out initial permutation；
Step S3：By the plaintext after displacement in the presence of chaotic key, the interative computation of 16 wheels is carried out；
Step S4：Plaintext after interative computation is subjected to last displacement；
Step S5：The plaintext of 64 bits after the last displacement of progress is represented sequentially as c1,c2,...,c64。
Preferably, the step S3 is specifically included：
Step S31：64 bits after displacement are divided into the left and right ciphertext L of each 32 bit in plain texti-1And Ri-1, wherein, i is represented
I-th wheel operation；
Step S32：To the right ciphertext R of 32 bitsi-1Displacement is extended, i.e., the input key of 32 bits according to certain
Rule Extended to 48 bits, obtain the input key of 48 bits；
Step S33：The key of 48 bits after the key and key conversion of 48 bits after extension is subjected to exclusive or；
Step S34：After key after the input key and key conversion of 48 bits is carried out exclusive or, exclusive or result carries out
S, P boxes are replaced；
Step S35：By the left-half L of plaintext after the displacement of initial 64 biti-1It is carried out again with the result of S, P box displacement
Exclusive or, exclusive or result become new right plaintext Ri, and pass through exchange by old right plaintext Ri-1Become new left plaintext Li。
Preferably, the step 33 specifically further includes：
Step S331：For the chaos sequence that improved Logistic mappings are generated as key, when input is 64 bits,
Remove the parity check bit of 8 bits, obtain the key of 56 bits；
Step S332：The key of 56 bits is divided into two parts of each 28 bit, ring shift left one or two, obtains respectively
To the data of 56 new bits；
Step S333：The data of 56 new bits are subjected to compression displacement, so as to obtain the key of 48 bits.
Preferably, the DES data encryption algorithm includes the following steps every group of encryption of plaintext process：
Step S01：Initial permutation IP is carried out to the plaintext of 64 bits, upsets bit sequence, and the plaintext after displacement point
For the part of left and right two of each 32, it is denoted as L0And R0；
Step S02：Using the key of 64 bits as initial value, using sub-key generating algorithm, used when generating iterative cryptographic
16 sub-keys：K1,K2,K3,…,K14,K15,K16；
Step S03：The loop iteration operation of 16 wheels is carried out using F functions, wherein preceding 15 wheel can be calculated with equation below
Go out：
Wherein,XOR operation is represented, since last wheel left-right parts does not exchange, so L16And R16It can be by equation below
It is calculated：
Step S04：L16And R16Merge, carry out inverse initial permutation IP-1, ciphertext is obtained, DES algorithms are after every group encryption
Ciphertext connect, obtain final encryption data.
Preferably, the F functions are nonlinear function, put including extension displacement E, XOR operation, the displacement of S boxes and P boxes
Four processes are changed, can be represented with equation below：
Wherein, ⊕ represents XOR operation, KiRepresent initial key by displacement selection PC-1, ring shift left and displacement selection
The i-th respective loops that the operations such as PC-2 obtain.
Compared with the prior art, the beneficial effects of the present invention are：The present invention provides a kind of based on mobile Internet
Improved DES data encryption algorithm has superior sensibility and good randomness；The present invention's is mapped based on Logistic
Encryption Algorithm for conventional encryption algorithm, enciphering rate is faster, more efficient, safety is more preferable；The knot of the present invention
Chaotic maps and the data encryption system of des encryption algorithm are closed, are played a protective role for the data transmission in mobile Internet, and
Leakage of data or under attack is prevented, improves the safety of data.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical solution in various embodiments of the present invention
The attached drawing used is briefly described.
Fig. 1 is the structure diagram of the data encryption system of the present invention；
Fig. 2 is the flow diagram of the chaos des encryption algorithm of the present invention；
Fig. 3 is the flow diagram of the step S3 of the present invention；
Fig. 4 is the flow diagram of the key conversion in the step S33 of the present invention；
Fig. 5 is the des encryption algorithm of the present invention to every group of encryption of plaintext flow diagram；
Fig. 6 is the des encryption algorithm of the present invention to every group of encryption of plaintext process schematic.
Specific embodiment
Below in conjunction with attached drawing, the forgoing and additional technical features and advantages are described in more detail.
As shown in Figure 1, a kind of data of improved DES data encryption algorithm based on mobile Internet for the present invention add
Close system structure diagram, in the data transmission procedure of mobile Internet, can generate needs encrypted data, using Chinese character as
Chinese character, according to ASCII character, is converted to metric form, is then converted into binary form, is then input to database by example
In server, into Database Encrypt System.Database Encrypt System includes plaintext, ciphertext, algorithm and key, wherein, algorithm
For DES data encryption algorithm, DES data encryption algorithm is the function algorithm for carrying out data encryption and decryption, and key is
The key of Logistic mapping generations.
In the Database Encrypt System of the present invention, system is fully transparent to the end user of database, and data administrator can
The specified conversion work for needing encrypted data and carry out plaintext or ciphertext as needed；System is totally independent of database should
With system, do not need to change database application system and can be achieved with encryption function, simultaneity factor employs des encryption algorithm and is used in combination
Logistic generate key, enciphering rate faster, safety higher；System carries out data encrypting and deciphering operation in client, will not
Influence the system effectiveness of database server.
DES data encryption algorithm is a kind of symmetrical grouping algorithm, and safety depends on the secrecy of key.The algorithm will
It is divided into several groups in plain text, every group of length is 64 bits, and key length is also 64 bits, wherein, effective key digit only has 56
Bit, key space 256, the ciphertext of 64 bits is obtained after every group of plaintext encryption.
Logistic maps a kind of One Dimensional Chaotic Maps, and form is simple, and with complicated dynamic behavior.
Logistic mapping definitions are as shown by the following formula：
xn+1=f (u, xn)=uxn(1-xn)
Wherein, u parameters in order to control meet 0≤u≤4, x ∈ (0,1).When u values are more than 3.5699456, system enters mixed
Ignorant state.When defining a suitable threshold value, Logistic sequences can be converted to a binary sequence, in of the invention
Threshold value th is calculated as follows：
Wherein, xiFor the item in sequence, n is the item number of generation.
Due to Logistic sequence pairs initial value sensitivity, there is noise like, be easily converted to binary sequence, so
In the data encryption algorithm of the present invention, key is generated using Logistic mappings.
As shown in Fig. 2, the flow diagram of the chaos des encryption algorithm for the present invention, is as follows：
Step S1：The plaintext of 64 bits is from left to right represented sequentially as m1,m2,…,m64。
Step S2：By the plaintext m of 64 bits1,m2,…,m64Carry out initial permutation.
Step S3：By the plaintext after displacement in the presence of chaotic key, the interative computation of 16 wheels is carried out.
Step S4：Plaintext after interative computation is subjected to last displacement.
Step S5：The plaintext of 64 bits after the last displacement of progress is represented sequentially as c1,c2,…,c64。
As shown in figure 3, the flow diagram for step S3, each round interative computation step in step S3 specifically includes：
Step S31：64 bits after displacement are divided into the left and right ciphertext L of each 32 bit in plain texti-1And Ri-1, wherein, i is represented
I-th wheel operation.
Step S32：To the right ciphertext R of 32 bitsi-1Displacement is extended, i.e., the input key of 32 bits according to certain
Rule Extended to 48 bits, obtain the input key of 48 bits.
Step S33：The key of 48 bits after the key and key conversion of 48 bits after extension is subjected to exclusive or.
Step S34：After key after the input key and key conversion of 48 bits is carried out exclusive or, exclusive or result carries out
S, P boxes are replaced.Wherein, the displacement of S boxes is that the 48 bits input that will be obtained obtains the output of 32 bits with replacement technology again；P boxes are replaced
Only simple displacement, changes another one into, without extending and compressing by one.
Step S35：By the left-half L of plaintext after the displacement of initial 64 biti-1It is carried out again with the result of S, P box displacement
Exclusive or, exclusive or result become new right plaintext Ri, and pass through exchange by old right plaintext Ri-1Become new left plaintext Li。
As shown in figure 4, the flow diagram for the key conversion in step S33, key conversion the specific steps are：
Step S331：For the chaos sequence that improved Logistic mappings are generated as key, when input is 64 bits,
Remove the parity check bit of 8 bits, obtain the key of 56 bits.
Step S332：The key of 56 bits is divided into two parts of each 28 bit, ring shift left one or two, obtains respectively
To the data of 56 new bits.
Step S333：The data of 56 new bits are subjected to compression displacement, so as to obtain the key of 48 bits.
As shown in figure 5, for DES algorithms to each group of encryption of plaintext flow diagram, include the following steps：
Step S01：Initial permutation IP is carried out to the plaintext of 64 bits, upsets sequence in plain text, and the plaintext after displacement point
For the part of left and right two of each 32, it is denoted as L0And R0；
Step S02：Using the key of 64 bits as initial value, using sub-key generating algorithm, used when generating iterative cryptographic
16 sub-keys：K1,K2,K3,…,K14,K15,K16。
Step S03：The loop iteration operation of 16 wheels is carried out using F functions, wherein preceding 15 wheel can be calculated with equation below
Go out：
Wherein,Represent XOR operation.Since last wheel left-right parts does not exchange, so L16And R16It can be by equation below
It is calculated：
Step S04：L16And R16Merge, carry out inverse initial permutation IP-1, ciphertext is obtained, DES algorithms are after every group encryption
Ciphertext connect, obtain final encryption data.
As shown in fig. 6, for des encryption algorithm to every group of encryption of plaintext process schematic, in step S03, F functions are
It is nonlinear, including extension displacement E, XOR operation, S boxes displacement (compression is replaced) and P boxes displacement Four processes, can use as follows
Formula represents：
Wherein,Represent XOR operation, KiRepresent initial key by displacement selection PC-1, ring shift left and displacement selection
The i-th respective loops that the operations such as PC-2 obtain.
The decrypting process of DES algorithms is similar with ciphering process, using the ciphertext of 64 bits as input, plaintext conduct during decryption
Output.Decryption and ciphering process it is unique unlike, during decryption sub-key using sequence and encryption when sub-key use it is suitable
Sequence is opposite.
A kind of improved DES data encryption algorithm based on mobile Internet provided by the invention, since Logistic reflects
It penetrates with superior sensibility and good randomness, is entirely capable of in information security field；The present invention based on
The Encryption Algorithm of Logistic mappings is for conventional encryption algorithm, and enciphering rate is faster, more efficient, and safety
More preferably；The combination chaotic maps of the present invention and the data encryption system of des encryption algorithm, are the data transmission in mobile Internet
It plays a protective role, and prevents leakage of data or under attack, improve the safety of data.
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art,
It still can modify to the technical solution recorded in foregoing embodiments or which part technical characteristic is carried out etc.
With replacing, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection domain of invention.
Claims (5)
1. a kind of improved DES data encryption algorithm based on mobile Internet, which is characterized in that the algorithm includes following step
Suddenly：
Step S1：The plaintext of 64 bits is from left to right represented sequentially as m1,m2,…,m64；
Step S2：By the plaintext m of 64 bits1,m2,…,m64Carry out initial permutation；
Step S3：By the plaintext after displacement in the presence of chaotic key, the interative computation of 16 wheels is carried out；
Step S4：Plaintext after interative computation is subjected to last displacement；
Step S5：The plaintext of 64 bits after the last displacement of progress is represented sequentially as c1,c2,...,c64。
2. a kind of improved DES data encryption algorithm based on mobile Internet according to claim 1, feature exist
In the step 3 specifically includes：
Step S31：64 bits after displacement are divided into the left and right ciphertext L of each 32 bit in plain texti-1And Ri-1, wherein, i represents i-th
Take turns operation；
Step S32：To the right ciphertext R of 32 bitsi-1Displacement is extended, i.e., the input key of 32 bits according to certain rule
48 bits are then expanded to, obtain the input key of 48 bits；
Step S33：The key of 48 bits after the key and key conversion of 48 bits after extension is subjected to exclusive or；
Step S34：By 48 bits input key and key conversion after key carry out exclusive or after, by its exclusive or result carry out S,
P boxes are replaced；
Step S35：By the left-half L of plaintext after the displacement of initial 64 biti-1Exclusive or is carried out again with the result of S, P box displacement,
Its exclusive or result becomes new right plaintext Ri, and pass through exchange, by old right plaintext Ri-1Become new left plaintext Li。
3. a kind of improved DES data encryption algorithm based on mobile Internet according to claim 2, feature exist
In the step 33 specifically further includes：
Step S331：Using the chaos sequence that improved Logistic mappings generate as key, it is 64 bits when inputting, removes
The parity check bit of 8 bits obtains the key of 56 bits；
Step S332：The key of 56 bits is divided into two parts of each 28 bit, respectively ring shift left one or two, obtained new
56 bits data；
Step S333：The data of 56 new bits are subjected to compression displacement, so as to obtain the key of 48 bits.
4. a kind of improved DES data encryption algorithm based on mobile Internet according to claim 1, feature exist
In the DES data encryption algorithm includes the following steps every group of encryption of plaintext process：
Step S01：Initial permutation IP is carried out to the plaintext of 64 bits, upsets sequence in plain text, and the plaintext after displacement is divided into respectively
The part of left and right two of 32, is denoted as L0And R0；
Step S02：Using the key of 64 bits as initial value, using sub-key generating algorithm, 16 used during iterative cryptographic are generated
A sub-key：K1,K2,K3,...,K14,K15,K16；
Step S03：The loop iteration operation of 16 wheels is carried out using F functions, wherein preceding 15 wheel can be calculated with equation below：
Wherein,Represent XOR operation.Since last wheel left-right parts does not exchange, so L16And R16It can be calculated by equation below
It obtains：
Step S04：L16And R16Merge, carry out inverse initial permutation IP-1, ciphertext is obtained, DES algorithms are close after every group encryption
Text connects, and obtains final encryption data.
5. a kind of improved DES data encryption algorithm based on mobile Internet according to claim 4, feature exist
In the F functions are nonlinear function, can including extension displacement E, XOR operation, the displacement of S boxes and P boxes displacement Four processes
It is represented with equation below：
Wherein,Represent XOR operation, KiRepresent initial key by displacement selection PC-1, ring shift left and displacement selection PC-2
The i-th respective loops that operations is waited to obtain.
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Cited By (5)
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| CN110677237A (en) * | 2019-11-04 | 2020-01-10 | 郑州轻工业学院 | File encryption method with chaos-like characteristic |
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| CN113434332A (en) * | 2021-05-27 | 2021-09-24 | 国家信息技术安全研究中心 | Fault propagation-based key recovery method for DES/3DES middle wheel attack |
| CN113660620A (en) * | 2021-10-20 | 2021-11-16 | 北京卓建智菡科技有限公司 | Data anti-counterfeiting encryption method and device, computer equipment and storage medium |
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| CN113434332A (en) * | 2021-05-27 | 2021-09-24 | 国家信息技术安全研究中心 | Fault propagation-based key recovery method for DES/3DES middle wheel attack |
| CN113660620A (en) * | 2021-10-20 | 2021-11-16 | 北京卓建智菡科技有限公司 | Data anti-counterfeiting encryption method and device, computer equipment and storage medium |
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