TWI397300B - Digital information encryption method - Google Patents

Description

Digital information encryption method

The present invention relates to an encryption method, and more particularly to a digital information encryption method.

In the field of computer or communication, there are many digital information encryption methods, and block encryption is one of the easier hardware implementations. However, block encryption is easy to crack. Block encryption is vulnerable to cipher text searching, replay, insert and delete, because block encryption is encrypted independently for each data block.

Some conventional techniques have revealed ways to remedy the above weaknesses. For example, a self-synchronous stream cipher in cipher feed back mode or a cipher block chaining (CBC). Among them, code block chain coding (CBC) is often used to establish message authentication codes (MAC).

Message authentication allows the communication of the partners to verify whether a received message comes from the user who owns the key by sharing a secret key. This is the most important and widely used cryptographic technique in data communication.

One of the commonly used digital information encryption methods, referred to as Random Code Chaining (RCC) encryption and decryption, the following examples:

<encryption>

To encrypt an original message sequence, the sequence is first cut into a number of original information blocks M _t , where t is a natural number. Assume that each original information block (blocks) M _t is 32 bits in length. Then, using an encryption equation (1) for encryption, the equation of equation (91) is encrypted as follows: C _t = E _k [( M _t ⊕ R _{t -1} ) 2 ³² + R _t ] (91)

Wherein, C _t is an encrypted information block, E _k [] represents any 64-bit encryption operation, ⊕ represents an addition of 2 modulo, and R ₀ is a random encryption code of 32 bits in length.

<decryption>

In order to decrypt the original information block M _t from the encrypted information block C _t , a de-encrypted information block C ^* _t can be obtained from equation (92): C ^* _t = D _k [C _t ] = D _k [( M _t ⊕ R _{t -1} ) 2 ³² + R _t ] (92)

Where D _k [] represents any decryption operation corresponding to the E _k [].

Thereafter, the solution after the encrypted information block C ^* _t by formula (93), a solution can be obtained original information encrypted block and M ^* _t of the original information block M _t:

However, this technique is still too simple to resist the threat of cracking. Other other conventional techniques are too complex to be hardware-implemented.

The object of the present invention is to provide a digital information encryption method with excellent crack resistance.

Another object of the present invention is to provide a digital information encryption method capable of easily switching an encryption method without being easily cracked.

In order to achieve the above-mentioned creative purposes, the technical means used by the present invention and the effects achieved by the technical means are as follows:

The invention provides a digital information encryption method, which comprises: cutting an original information sequence into a number of original information blocks; determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information. After the block and a second encrypted information block, if the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second Encrypted information block; judging whether a secret culture random password exists, if the judgment result is yes, adding the original information block and the first encrypted information block, and adding the password with the secret culture, the result is added The bit is stored in a lower bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated, and the original information block is added to the first encrypted information block, and the secret is added. The culture is randomly added with a password to add the result bit to the lower bit of the quasi-encrypted information block; the second encrypted letter is The block and the secret culture are randomly added with a password to add the result bit to the higher bit of the quasi-encrypted information block; the secret culture random encryption code is added to the second encrypted information block, and the result is stored back to the block The secret culture is randomly added with a password; and the quasi-encrypted information block is subjected to an encryption operation to obtain the encrypted information block; The information block is encrypted until the original information sequence is encrypted.

The invention further provides a digital information encryption method, comprising: cutting an original information sequence into a number of original information blocks; determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted After the information block and the second encrypted information block, if the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the first Second, the information block after encryption; determining whether a secret culture random password exists, if the judgment result is yes, adding the original information block and the first encrypted information block, and adding the password with the secret culture, and adding The result is stored in a higher bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated, and the original information block and the first encrypted information block are added, and the secret is added. The culture is randomly added with a password for addition, and the result bit is stored to a higher bit of the quasi-encrypted information block; after the second encryption The interest block is added with the secret culture random encryption code, and the result bit is stored in the lower bit of the quasi-encrypted information block; the secret culture random encryption code is added to the second encrypted information block, and the result is saved. Returning the secret culture to the random password; and encrypting the quasi-encrypted information block to obtain the encrypted information block; sequentially encrypting each original information block until the original information sequence is encrypted.

The invention further provides a digital information encryption method, comprising: determining whether an encrypted information box exists, and if the determination result is yes, cutting the encrypted information square into a first encrypted information block and a second encrypted information block. If the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encryption. a post-information block and the second encrypted information block; determining whether a secret culture random encryption password exists, and if the judgment result is yes, adding an original information block and the first encrypted information block, and the secret culture random Adding a password for adding, storing the result bit to a lower bit of the quasi-encrypted information block, and if the judgment result is no, randomly generating the secret culture random plus password, the original information block and the first encrypted information block Adding, and adding the password with the secret culture, adding the result bit to the lower bit of the quasi-encrypted information block; adding the second encrypted information block and the secret culture random encryption code, The result is stored in the higher bit of the quasi-encrypted information block; the secret culture random encryption code is added to the second encrypted information block, and the result is stored back to the secret culture random encryption password; and the quasi-encrypted The information block performs an encryption operation to obtain the encrypted information block.

The invention further provides a digital information encryption method, comprising: determining whether an encrypted information box exists, and if the determination result is yes, cutting the encrypted information square into a first encrypted information block and a second encrypted information block. If the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second encrypted information block; Whether the random encryption password exists, if the judgment result is yes, adding an original information block and the first encrypted information block, and adding the password with the secret culture, and storing the result bit to a quasi-encrypted information block. The higher bit, if the judgment result is no, randomly generates the secret culture random encryption code, adds the original information block and the first encrypted information block, and adds the password with the secret culture to add the result, and the result bit Save to a quasi-encrypted The higher bit of the information block; the second encrypted information block is added with the secret culture random encryption code, and the result bit is stored in the lower bit of the quasi-encrypted information block; the secret culture is randomly added with the password and The second encrypted information block is added, and the result is stored back to the secret culture random encryption code; and the quasi-encrypted information block is encrypted to obtain the encrypted information block.

According to the digital information encryption method of the preferred embodiment of the present invention, the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes the higher bit of the encrypted information block. The segment data is cut into the first encrypted information block, and the lower byte segment data of the encrypted information block is cut into the second encrypted information block.

According to the digital information encryption method of the preferred embodiment of the present invention, the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes the lower bit of the encrypted information block. The meta-paragraph data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block.

According to the digital information encryption method of the preferred embodiment of the present invention, setting an initial ciphertext plus password to the encrypted information block includes setting a randomly generated initial ciphertext plus password as the encrypted information block.

According to the digital information encryption method of the preferred embodiment of the present invention, the setting of an initial ciphertext plus password to the encrypted information block includes setting a predetermined initial ciphertext plus password as the encrypted information block.

By cutting the encrypted information block for the next encryption by freely selecting the high or low bit cutting mode, and freely selecting the storage mode of the high or low bit, storing a quasi-encrypted information block to add By embedding the encrypted information block, the present invention provides the user with a degree of freedom of operation, and can enhance the crack resistance of the digital information encryption method.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Please refer to FIGS. 1a and 1b, which are flowcharts of a method for encrypting digital information according to a preferred embodiment of the present invention. As shown in the figure, the digital information encryption method of the preferred embodiment of the present invention performs encryption according to the following steps: (S1) cutting an original information sequence into a number of original information blocks; (S2) determining whether an encrypted information block exists, and if the result is determined If yes, the encrypted information block is cut into a first encrypted information block and a second encrypted information block. If the determination result is no, an initial ciphertext plus password is set as the encrypted information block, and the After the encryption, the information block is cut into the first encrypted information block and the second encrypted information block; (S3) determining whether a secret culture random encryption password exists, and if the determination result is yes, the original information block and the first After the encryption, the information block is added, and the secret culture is added with a random password, and the result is stored in a lower bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated. Adding the original information block and the first encrypted information block, and adding the password with the secret culture, adding the result bit to a quasi-encrypted letter a lower bit of the block; (S4) adding the second encrypted information block to the secret culture random encryption code, and storing the result bit to a higher bit of the quasi-encrypted information block; (S5) the secret Culture random encryption and the second encrypted letter The information block is added, and the result is stored back to the secret culture random encryption code; and (S6) the quasi-encrypted information block is encrypted to obtain the encrypted information block; each of the original information blocks is sequentially encrypted until the The original information sequence is encrypted.

Please refer to FIGS. 2a and 2b, which are flowcharts of a method for encrypting digital information according to another preferred embodiment of the present invention. As shown in the figure, the digital information encryption method of the preferred embodiment of the present invention performs encryption according to the following steps: (S1) cutting an original information sequence into a number of original information blocks; (S2) determining whether an encrypted information block exists, and if the result is determined If yes, the encrypted information block is cut into a first encrypted information block and a second encrypted information block. If the determination result is no, an initial ciphertext plus password is set as the encrypted information block, and the After the encryption, the information block is cut into the first encrypted information block and the second encrypted information block; (S3) determining whether a secret culture random encryption password exists, and if the determination result is yes, the original information block and the first After the encryption, the information block is added, and the secret culture is added with a random password, and the result is stored in a higher bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated. The original information block is added to the first encrypted information block, and is added to the secret culture random encryption code, and the result bit is stored in a quasi-encrypted letter. (S4) adding the second encrypted information block and the secret culture random encryption code, and storing the result bit to the lower bit of the quasi-encrypted information block; (S5) the secret The culture random encryption code and the second encrypted information block are added, and the result is stored back to the secret culture random encryption password; and (S6) the quasi-encrypted information block is encrypted to obtain the encrypted information information block; Encrypt each original information block until the original The information sequence is encrypted.

Combining the descriptions of Figures 1a, 1b and 2a, 2b, the digital information encryption method of the preferred embodiment of the present invention can be further subdivided as follows.

Please refer to FIGS. 3a and 3b, which are detailed flowcharts of the digital information encryption method according to the preferred embodiment of the present invention. As shown in the figure, the digital information encryption method of the preferred embodiment of the present invention performs encryption according to the following steps: (S1) cutting an original information sequence into a number of original information blocks; (S20) determining whether an encrypted information block exists, and if the result is determined If so, (S21) the encrypted information block is cut into a first encrypted information block and a second encrypted information block. If the determination result is no, (S22) an initial ciphertext plus password is set as the encryption. After the information block, (S21) cutting the encrypted information block into the first encrypted information block and the second encrypted information block; (S30) determining whether a secret culture random encryption password exists, and if the judgment result is yes, (S31) adding the original information block and the first encrypted information block, and adding the password with the secret culture, adding the result bit to a lower bit of the quasi-encrypted information block, if the result is determined If not, (S32) randomly generates the secret culture random encryption code, (S31) adding the original information block and the first encrypted information block, and adding the password with the secret culture, and adding The fruit position is stored in a lower bit of the quasi-encrypted information block; (S4) the second encrypted information block is added to the secret culture random encryption code, and the result bit is stored in the quasi-encrypted information block. (S5) adding the secret culture random encryption code and the second encrypted information block, storing the result back to the secret culture random encryption password; and (S6) encrypting the quasi-encrypted information block, Obtaining the encrypted information block; each of the original information blocks is sequentially encrypted until the original information sequence is encrypted.

Please refer to FIGS. 4a and 4b, which are detailed flowcharts of the digital information encryption method according to another preferred embodiment of the present invention. As shown in the figure, the digital information encryption method of the preferred embodiment of the present invention performs encryption according to the following steps: (S1) cutting an original information sequence into a number of original information blocks; (S20) determining whether an encrypted information block exists, and if the result is determined If so, (S21) the encrypted information block is cut into a first encrypted information block and a second encrypted information block. If the determination result is no, (S22) an initial ciphertext plus password is set as the encryption. After the information block, (S21) cutting the encrypted information block into the first encrypted information block and the second encrypted information block; (S30) determining whether a secret culture random encryption password exists, and if the judgment result is yes, (S31) adding the original information block and the first encrypted information block, and adding the password with the secret culture, and storing the result bit to a higher bit of the quasi-encrypted information block, if the judgment result is No, (S32) randomly generating the secret culture random encryption code, (S31) adding the original information block and the first encrypted information block, and adding the password with the secret culture, and adding The fruit position is stored in a higher bit of the quasi-encrypted information block; (S4) adding the second encrypted information block and the secret culture random encryption code, and storing the result bit to the lower of the quasi-encrypted information block Bit (S5) adding the secret culture random encryption code and the second encrypted information block, storing the result back to the secret culture random encryption password; and (S6) encrypting the quasi-encrypted information block, Obtaining the encrypted information block; each of the original information blocks is sequentially encrypted until the original information sequence is encrypted.

Please refer to FIG. 5, which is a flowchart of cutting the encrypted information block in the digital information encryption method according to the above two preferred embodiments of the present invention. As shown in the figure, wherein the encrypted information block is cut into the first plus The secret information block and the second encrypted information block include two cutting methods: first, (S211) cutting the lower bit segment data of the encrypted information block into the first encrypted information block, and The higher bit segment data of the encrypted information block is cut into the second encrypted information block; second, (S212) the higher bit segment data of the encrypted information block is cut into the first encrypted information block, and The lower byte segment data of the encrypted information block is cut into the second encrypted information block.

According to this, the user can freely select the cutting mode of the high or low bit, cut an encrypted information block for the next encryption, and freely select the storage mode of the high or low bit, and store a quasi-encrypted information block. To encrypt into the encrypted information block.

In order to enable those skilled in the art to better understand the advantages of the present invention and to implement the same, the embodiments of the preferred embodiments of the present invention are exemplified below with reference to the accompanying drawings. For detailed explanation:

<First Embodiment>

Referring to FIG. 6, in the digital information encryption method according to the first embodiment of the present invention, in order to encrypt an original information sequence M , referring to the above step S1, the method preferably first cuts the information sequence M into a plurality of original information. The block M _t , t is a natural number, assuming N is the maximum number of squares after the original information sequence is cut, and the following is an example of an original information block M ₁ , an original information block M ₂ , ... to an original information block M _N encryption process.

In the initial state, when the original information block M ₁ is to be encrypted, the digital information encryption method according to the preferred embodiment of the present invention has not been executed, so that an encrypted information block C ₀ does not yet exist. Referring to the above step S20, it is judged that the encrypted information block C ₀ does not exist. Therefore, the initial ciphertext plus password C ₀ ' is randomly generated by referring to the above step S22. The length of each original information block M _t may be 2 ⁱ bits, and the initial ciphertext plus password C ₀ ' is 2 ⁱ⁺¹ bits, and i is a natural number.

The initial ciphertext plus password C ₀ ' is set to the encrypted information block C ₀ . Referring to the above step S21, the encrypted information block C ₀ can be cut into a first encrypted information block. And a second encrypted information block .

Because in the initial state block to be encrypted original information M _1, the digital information encrypted by the method of Example of preferred embodiments of the present invention has not been performed for the first time is completed, a dense culture encrypted random nor R ₀ is present, referring to the step S30, it is determined The secret culture random encryption code R ₀ does not exist. Therefore, referring to the above step S32, the secret culture random encryption code R _{0 is} randomly generated. The secret culture random encryption code R ₀ length is 2 ⁱ bits.

Referring to step S31 above, the original information block M _{1 is} first and the first encrypted information block. Perform the addition of modulus 2, and then add the modulus to 2 with the secret culture random addition code R ₀ , and store the result to the lower bit of the quasi-encrypted information block C ₀ ”. Refer to the above S4 Step, and the second encrypted information block And the secret culture random encryption code R _{0 is} performed with a modulus of 2 addition sum, and then the 2-digit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then stored in the higher-order information block C ₀ ” The above information is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits to obtain an encrypted information block C ₁ , as in equation (11): Wherein, (S212) the first encrypted information block Selecting the higher bit segment data of the encrypted information block C ₀ , the second encrypted information block The lower byte data of the encrypted information block C ₀ is selected, and the encryption operation E _k [] can be any 2 ⁱ⁺¹ bit encryption operation.

Similarly, after the encryption of the first original information block M ₁ is completed, the original information block M ₂ can be encrypted.

Referring to step S21 above, the encrypted information block C _{0 is} cut into the first encrypted information block. And the second encrypted information block . Referring to step S31 above, the original information block M _{2 is} first and the first encrypted information block. Perform the addition of modulus 2, and then add the modulus to 2 with the secret culture random encryption code R ₁ , and store the result to the lower bit of the quasi-encrypted information block C ₁ ”. Referring to the above S4 step, Second encrypted information block Then, the modulus is randomly added with the password R ₁ and the modulus is 2 additions, and then the 2-bit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then the information block C ₁ ” is added to the higher-order position after the quasi-encryption. Referring to the above step S5, the above data is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits to obtain the encrypted information block C ₂ , as in equation (12): Wherein, (S212) the first encrypted information block After selecting information for the encrypted data block C of _a higher-bit segments, after the second encrypted information block After selecting information for the encrypted data block C of _a lower-bit segment, and the encrypted random dense culture R & lt adhesion after culture for ₁ randomly selected encrypted information encrypted with the second R ₀ block The modulus is 2 additions and the formula is as shown in (13):

Referring to the above steps S1 to S6, and so on, the original information block M _{N is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulus of 2 with the random culture password R _N-1 , and store the result to the lower bit of the quasi-encrypted information block C _N-1 ”. Second encrypted information block Then, with the secret culture random encryption code R _N-1 , the modulus is 2 addition sum, and then the 2-digit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then the quasi-encrypted information block C _{N-1 is} stored. To the higher bit. The above information is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits to obtain the encrypted information block C _N , and the equation is as shown in formula (14): Wherein, (S212) the first encrypted information block Selecting the higher byte segment data of the encrypted information block C _N-1 , the second encrypted information block The lower byte segment data of the encrypted information block C _N-1 is selected, and the secret culture random encryption password R _{N is} selected as the secret culture random encryption password R _N-1 and the second encrypted information block. The modulus is 2 additions and sums.

Thereby, the original information block M _{0 is} to be solved by the encrypted information block C _N to obtain the complete original information sequence M , and the decryption end needs to completely receive the encrypted information block C _N to the encrypted The information block C ₁ and the encrypted information block C ₀ and the secret culture random encryption code R ₀ must be known. Compared with the conventional digital information encryption method, the digital information encryption method of the embodiment greatly improves the threat resistance.

Of course, the user can freely select the cutting mode of the high or low bit, cut an encrypted information block for the next encryption, and freely select the storage mode of the high or low bit, and store a quasi-encrypted information block. Encrypted into the encrypted information block. Please continue to refer to the following examples.

<Second embodiment>

Referring to FIG. 7, in the digital information encryption method according to the second embodiment of the present invention, in order to encrypt an original information sequence M , referring to the above step S1, the method preferably first cuts the information sequence M into a plurality of original information. The block M _t , t is a natural number, assuming N is the maximum number of squares after the original information sequence is cut, and the following is an example of an original information block M ₁ , an original information block M ₂ , ... to an original information block M _N encryption process.

In the initial state, when the original information block M ₁ is to be encrypted, the digital information encryption method according to the preferred embodiment of the present invention has not been executed, so that an encrypted information block C ₀ does not yet exist. Referring to the above step S20, it is judged that the encrypted information block C ₀ does not exist. Therefore, referring to the above step S22, the initial ciphertext plus password C ₀ ' is randomly generated. The length of each original information block M _t may be 2 ⁱ bits, and the initial ciphertext plus password C ₀ ' is 2 ⁱ⁺¹ bits, and i is a natural number.

The initial ciphertext plus password C ₀ ' is set to the encrypted information block C ₀ . Referring to the above step S21, the encrypted information block C ₀ can be cut into a first encrypted information block. And a second encrypted information block .

Because in the initial state block to be encrypted original information M _1, the digital information encrypted by the method of Example of preferred embodiments of the present invention has not been performed for the first time is completed, a dense culture encrypted random nor R ₀ is present, referring to the step S30, it is determined The secret culture random encryption code R ₀ does not exist. Therefore, referring to the above step S32, the secret culture random encryption code R _{0 is} randomly generated. The secret culture random encryption code R ₀ length is 2 ⁱ bits.

Referring to step S31 above, the original information block M _{1 is} first and the first encrypted information block. Perform the addition of modulus 2, and then add the modulus to 2 with the secret culture random addition code R ₀ , and store the result to the lower bit of the quasi-encrypted information block C ₀ ”. Refer to the above S4 Step, and the second encrypted information block And the secret culture random encryption code R _{0 is} performed with a modulus of 2 addition sum, and then the 2-digit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then stored in the higher-order information block C ₀ ” The above information is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits to obtain an encrypted information block C ₁ , as in equation (21): Wherein, (S211) the first encrypted information block Selecting the lower byte segment data of the encrypted information block C ₀ , the second encrypted information block The higher bit field data of the encrypted information block C ₀ is selected, and the encryption operation E _k [] can be any 2 ⁱ⁺¹ bit encryption operation.

Similarly, after the encryption of the first original information block M ₁ is completed, the original information block M ₂ can be encrypted.

Referring to step S21 above, the encrypted information block C _{0 is} cut into the first encrypted information block. And the second encrypted information block . Referring to step S31 above, the original information block M _{2 is} first and the first encrypted information block. Perform the addition of modulus 2, and then add the modulus to 2 with the secret culture random encryption code R ₁ , and store the result to the lower bit of the quasi-encrypted information block C ₁ ”. Referring to the above S4 step, Second encrypted information block Then, the modulus is randomly added with the password R ₁ and the modulus is 2 additions, and then the 2-bit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then the information block C ₁ ” is added to the higher-order position after the quasi-encryption. Referring to the above step S5, the above data is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits, and the encrypted information block C _{2 is obtained} , as in the equation (22): Wherein, (S211) the first encrypted information block After selecting information for the encrypted data block C of _a lower-bit segment, after the second encrypted information block The higher bit segment data of the encrypted information block C ₁ is selected, and the secret culture random encryption password R _{1 is} selected as the secret culture random encryption password R ₀ and the second encrypted information block. The modulus is 2 additions and the formula is as in (23):

Referring to the above steps S1 to S6, and so on, the original information block M _{N is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulus of 2 with the random culture password R _N-1 , and store the result to the lower bit of the quasi-encrypted information block C _N-1 ”. Second encrypted information block Then, with the secret culture random encryption code R _N-1 , the modulus is 2 addition sum, and then the 2-digit multiplication is multiplied by 2 ⁱ , and the result is shifted to the high-order element, and then the quasi-encrypted information block C _{N-1 is} stored. To the higher bit. The above information is subjected to the encryption operation E _k [] of 2 ⁱ⁺¹ bits, and the encrypted information block C _{N is obtained} , and the equation is as shown in the formula (24): Wherein, (S211) the first encrypted information block Selecting the lower byte segment data of the encrypted information block C _N-1 , the second encrypted information block The higher-order segment data of the encrypted information block C _N-1 is selected, and the secret culture random encryption password R _{N is} selected as the secret culture random encryption password R _N-1 and the second encrypted information block. The modulus is 2 additions and sums.

Therefore, the digital information encryption method according to the preferred embodiment of the present invention, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes the encrypted information block. The high-order segment data is cut into the first encrypted information block, and the lower-order segment data of the encrypted information block is cut into the second encrypted information block. .

Therefore, the digital information encryption method according to the preferred embodiment of the present invention, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes the encrypted information block. The low-order segment data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block.

Of course, the user can freely select the cutting mode of the high or low bit, cut an encrypted information block for the next encryption, and freely select the storage mode of the high or low bit, and store a quasi-encrypted information block. Encrypted into the encrypted information block. For a discussion of the free choice of high-order or low-order storage, store a quasi-encrypted information block. Continue to refer to the following examples.

<Third embodiment>

Referring to FIG. 8, in the digital information encryption method according to the third embodiment of the present invention, in order to encrypt an original information sequence M , referring to the above step S1, the method preferably first cuts the information sequence M into a plurality of original information. The block M _t , t is a natural number, assuming N is the maximum number of squares after the original information sequence is cut, and the following is an example of an original information block M ₁ , an original information block M ₂ , ... to an original information block M _N encryption process.

In the initial state, when the original information block M ₁ is to be encrypted, the digital information encryption method according to the preferred embodiment of the present invention has not been executed, so that an encrypted information block C ₀ does not yet exist. Referring to the above step S20, it is judged that the encrypted information block C ₀ does not exist. Therefore, referring to the above step S22, the initial ciphertext plus password C ₀ ' is randomly generated. The length of each original information block M _t may be 2 ⁱ bits, and the initial ciphertext plus password C ₀ ' is 2 ⁱ⁺¹ bits, and i is a natural number.

The initial ciphertext plus password C ₀ ' is set to the encrypted information block C ₀ . Referring to the above step S21, the encrypted information block C ₀ can be cut into a first encrypted information block. And a second encrypted information block .

Because in the initial state block to be encrypted original information M _1, the digital information encrypted by the method of Example of preferred embodiments of the present invention has not been performed for the first time is completed, a dense culture encrypted random nor R ₀ is present, referring to the step S30, it is determined The secret culture random encryption code R ₀ does not exist. Therefore, referring to the above step S32, the secret culture random encryption code R _{0 is} randomly generated. The secret culture random encryption code R ₀ length is 2 ⁱ bits.

Referring to step S31 above, the original information block M _{1 is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulus of 2 to the secret culture random addition code R ₀ , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high order, and save the result to a standard. Encrypted information block C ₀ " to the higher bit. Refer to step S4 above, and the second encrypted information block The modulo is added to the cryptographic number of the secret culture R ₀ and the result is stored in the lower bit of the quasi-encrypted information block C ₀ ”. The above data is subjected to the encryption operation of 2 ⁱ⁺¹ bits E _k [], you can get an encrypted information block C ₁ , as in (31): Wherein the first encrypted information block Selecting the higher bit segment data of the encrypted information block C ₀ , the second encrypted information block The lower byte data of the encrypted information block C ₀ is selected, and the encryption operation E _k [] can be any 2 ⁱ⁺¹ bit encryption operation.

Similarly, after the encryption of the first original information block M ₁ is completed, the original information block M ₂ can be encrypted.

Referring to step S21 above, the encrypted information block C _{0 is} cut into the first encrypted information block. And the second encrypted information block . Referring to step S31 above, the original information block M _{2 is} first and the first encrypted information block. Perform the addition of the modulus 2, and then add the modulo 2 to the encryption with the random code R ₁ , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high bit, and store the result to the quasi-encrypted The information block C ₁ ” to the higher bit. Referring to the above S4 step, the second encrypted information block Then, the modulo is added to the cryptographic number R ₁ with the secret culture random cryptogram R ₁ , and the result is stored in the lower bit of the quasi-encrypted information block C ₁ ”. Referring to the above S5 step, the above data is subjected to 2 ⁱ⁺¹ bits. The cryptographic operation E _k [] of the element can obtain the encrypted information block C ₂ , as in equation (32): Wherein the first encrypted information block After selecting information for the encrypted data block C of _a higher-bit segments, after the second encrypted information block After selecting information for the encrypted data block C of _a lower-bit segment, and the encrypted random dense culture R & lt adhesion after culture for ₁ randomly selected encrypted information encrypted with the second R ₀ block The modulus is 2 additions and the formula is as in (33):

Referring to the above steps S1 to S6, and so on, the original information block M _{N is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulo 2 to the dense culture random cryptogram R _N-1 , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high order, and save the result to the standard. After the encryption, the information block C _N-1 "up to the higher bit. And the second encrypted information block Then, the modulus is randomly added with the password R _N-1 and the modulus is 2 additions, and the result is stored in the lower bit of the quasi-encrypted information block C _N-1 ”. The above information is 2 ⁱ⁺¹ bits. The cryptographic operation E _k [] of the element can obtain the encrypted information block C _N , and the equation is as shown in formula (34): Wherein the first encrypted information block Selecting the higher byte segment data of the encrypted information block C _N-1 , the second encrypted information block The lower byte segment data of the encrypted information block C _N-1 is selected, and the secret culture random encryption password R _{N is} selected as the secret culture random encryption password R _N-1 and the second encrypted information block. The modulus is 2 additions and sums.

<Fourth embodiment>

Referring to FIG. 9, in the digital information encryption method according to the fourth embodiment of the present invention, in order to encrypt an original information sequence M , referring to the above step S1, the method preferably first cuts the information sequence M into a plurality of original information. The block M _t , t is a natural number, assuming N is the maximum number of squares after the original information sequence is cut, and the following is an example of an original information block M ₁ , an original information block M ₂ , ... to an original information block M _N encryption process.

In the initial state, when the original information block M ₁ is to be encrypted, the digital information encryption method according to the preferred embodiment of the present invention has not been executed, so that an encrypted information block C ₀ does not yet exist. Referring to the above step S20, it is judged that the encrypted information block C ₀ does not exist. Therefore, referring to the above step S22, the initial ciphertext plus password C ₀ ' is randomly generated. The length of each original information block M _t may be 2 ⁱ bits, and the initial ciphertext plus password C ₀ ' is 2 ⁱ⁺¹ bits, and i is a natural number.

The initial ciphertext plus password C ₀ ' is set to the encrypted information block C ₀ . Referring to the above step S21, the encrypted information block C ₀ can be cut into a first encrypted information block. And a second encrypted information block .

Because in the initial state block to be encrypted original information M _1, the digital information encrypted by the method of Example of preferred embodiments of the present invention has not been performed for the first time is completed, a dense culture encrypted random nor R ₀ is present, referring to the step S30, it is determined The secret culture random encryption code R ₀ does not exist. Therefore, referring to the above step S32, the secret culture random encryption code R _{0 is} randomly generated. The secret culture random encryption code R ₀ length is 2 ⁱ bits.

Referring to step S31 above, the original information block M _{1 is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulus of 2 to the secret culture random addition code R ₀ , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high order, and save the result to a standard. Encrypted information block C ₀ " to the higher bit. Refer to step S4 above, and the second encrypted information block The modulo is added to the cryptographic number of the secret culture R ₀ and the result is stored in the lower bit of the quasi-encrypted information block C ₀ ”. The above data is subjected to the encryption operation of 2 ⁱ⁺¹ bits E _k [], you can get an encrypted information block C ₁ , as in (41): Wherein the first encrypted information block Selecting the lower byte segment data of the encrypted information block C ₀ , the second encrypted information block The higher bit field data of the encrypted information block C ₀ is selected, and the encryption operation E _k [] can be any 2 ⁱ⁺¹ bit encryption operation.

Similarly, after the encryption of the first original information block M ₁ is completed, the original information block M ₂ can be encrypted.

Referring to step S21 above, the encrypted information block C _{0 is} cut into the first encrypted information block. And the second encrypted information block . Referring to step S31 above, the original information block M _{2 is} first and the first encrypted information block. Perform the addition of the modulus 2, and then add the modulo 2 to the encryption with the random code R ₁ , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high bit, and store the result to the quasi-encrypted The information block C ₁ ” to the higher bit. Referring to the above S4 step, the second encrypted information block Then, the modulo is added to the cryptographic number R ₁ with the secret culture random cryptogram R ₁ , and the result is stored in the lower bit of the quasi-encrypted information block C ₁ ”. Referring to the above S5 step, the above data is subjected to 2 ⁱ⁺¹ bits. The cryptographic operation E _k [] of the element can obtain the encrypted information block C ₂ , as in equation (42): Wherein the first encrypted information block After selecting information for the encrypted data block C of _a lower-bit segment, after the second encrypted information block The higher bit segment data of the encrypted information block C ₁ is selected, and the secret culture random encryption password R _{1 is} selected as the secret culture random encryption password R ₀ and the second encrypted information block. The modulus is 2 additions and the formula is as in (43):

Referring to the above steps S1 to S6, and so on, the original information block M _{N is} first and the first encrypted information block. Perform the addition of the modulus of 2, and then add the modulo 2 to the dense culture random cryptogram R _N-1 , then multiply the 2 ⁱ multiply by 2 ⁱ , shift the result to the high order, and save the result to the standard. After the encryption, the information block C _N-1 "up to the higher bit. And the second encrypted information block Then, the modulus is randomly added with the password R _N-1 and the modulus is 2 additions, and the result is stored in the lower bit of the quasi-encrypted information block C _N-1 ”. The above information is 2 ⁱ⁺¹ bits. The cryptographic operation E _k [] of the element can obtain the encrypted information block C _N , and the equation is as shown in formula (44): Wherein the first encrypted information block Selecting the lower byte segment data of the encrypted information block C _N-1 , the second encrypted information block The higher-order segment data of the encrypted information block C _N-1 is selected, and the secret culture random encryption password R _{N is} selected as the secret culture random encryption password R _N-1 and the second encrypted information block. The modulus is 2 additions and sums.

In addition, in the case where the length of the digital information is short, the digital information encryption method of the embodiment of the present invention can be more simplified.

<Fifth Embodiment>

Referring to FIG. 10a and FIG. 10b, the digital information encryption method according to another embodiment of the present invention performs encryption according to the following steps: determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information block and a second encrypted information block. If the determination result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted content. The information block and the second encrypted information block; determining whether a secret culture random encryption password exists, and if the judgment result is yes, adding the original information block and the first encrypted information block, and randomly adding the secret culture block The password is added, and the result bit is stored in a lower bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated, and the original information block is performed with the first encrypted information block. Adding, and adding the password with the secret culture, adding the result bit to the lower bit of the quasi-encrypted information block; after the second encryption An addition to the block information encrypted random culture encrypted, the result of the bit memory to the higher-bit encrypted registration information of block And adding the password to the second encrypted information block, storing the result back to the secret culture and adding the password; and encrypting the quasi-encrypted information block to obtain the encrypted information block.

<Sixth embodiment>

Referring to FIG. 11a and FIG. 11b, the digital information encryption method according to another embodiment of the present invention performs encryption according to the following steps: determining whether an encrypted information block exists. If the determination result is yes, the encrypted information block is cut into a first encrypted information block and a second encrypted information block. If the determination result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted content. The information block and the second encrypted information block; determining whether a secret culture random encryption password exists, and if the judgment result is yes, adding the original information block and the first encrypted information block, and randomly adding the secret culture block The password is added, and the result bit is stored in a higher bit of the quasi-encrypted information block. If the judgment result is no, the secret culture random encryption code is randomly generated, and the original information block is added to the first encrypted information block. And adding the password with the secret culture to add the result bit to the higher bit of the quasi-encrypted information block; after the second encryption The interest block is added with the secret culture random encryption code, and the result bit is stored in the lower bit of the quasi-encrypted information block; the secret culture random encryption code is added to the second encrypted information block, and the result is saved. Returning the secret culture to the random password; and encrypting the quasi-encrypted information block to obtain the encrypted information block.

In addition, the initial ciphertext plus password C ₀ ′ may also be selected as a preset value, and the receiving end may identify the transmitting end by setting the value of the initial ciphertext plus password C ₀ ′ in advance.

Therefore, in the digital information encryption method according to the preferred embodiment of the present invention, wherein an initial ciphertext plus password is set to the encrypted information block, the randomly generated initial ciphertext plus password is set as the encrypted information block. .

Therefore, in the digital information encryption method according to the preferred embodiment of the present invention, an initial ciphertext plus password is set to the encrypted information block, and a preset initial ciphertext plus password is set as the encrypted information block. .

By cutting the encrypted information block for the next encryption by freely selecting the high or low bit cutting mode, and freely selecting the storage mode of the high or low bit, storing a quasi-encrypted information block to encrypt In the encrypted information block, the present invention provides the user with a degree of freedom of operation, and can enhance the crack resistance of the digital information encryption method.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

M ‧‧‧Original information sequence

M _t , M ₁ , M ₂ ... M _N ‧‧‧ original information box

C ₀ '‧‧‧Initial ciphertext plus password

C ₀ , C ₁ , C ₂ ... C _N ‧‧‧ Encrypted information block

C ₀ ”, C ₁ ”... C _N-1 ”‧‧ ‧Quasi-encrypted information block

, ... ‧‧‧First encrypted information block

, ... ‧‧‧Second encrypted information block

R ₀ , R ₁ ... R _N-1 ‧‧ ‧ secret culture random password

Figure 1a is a flow chart of a digital information encryption method in accordance with a preferred embodiment of the present invention.

Figure 1b is a flow chart of a digital information encryption method in accordance with a preferred embodiment of the present invention.

Figure 2a is a flow chart of a digital information encryption method in accordance with another preferred embodiment of the present invention.

Figure 2b is a flow chart of a digital information encryption method in accordance with another preferred embodiment of the present invention.

Figure 3a is a detailed flow chart of the digital information encryption method in accordance with a preferred embodiment of the present invention.

Figure 3b is a detailed flow chart of the digital information encryption method in accordance with a preferred embodiment of the present invention.

Figure 4a is a detailed flow chart of a digital information encryption method in accordance with another preferred embodiment of the present invention.

Figure 4b is a detailed flow chart of the digital information encryption method in accordance with another preferred embodiment of the present invention.

Figure 5 is a flow chart showing the cutting of the encrypted information block in the digital information encryption method of the preferred embodiment of the present invention.

Figure 6 is a flow chart showing the calculation of the digital information encryption method in the first embodiment of the present invention.

Figure 7 is a flow chart showing the calculation of the digital information encryption method in the second embodiment of the present invention.

Figure 8 is a flow chart of the digital information encryption method of the third embodiment of the present invention Cheng Tu.

Figure 9 is a flow chart showing the calculation of the digital information encryption method in the fourth embodiment of the present invention.

Figure 10a is a flow chart of a method for encrypting digital information according to still another embodiment of the present invention.

Figure 10b is a flow chart of a digital information encryption method according to still another embodiment of the present invention.

Figure 11a is a flow chart of a method for encrypting digital information according to still another embodiment of the present invention.

Figure 11b is a flow chart of a method for encrypting digital information according to still another embodiment of the present invention.

Claims (20)

A digital information encryption method comprises: cutting an original information sequence into a number of original information blocks; determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information block and a After the second encrypted information block, if the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second encrypted information block. Blocking; determining whether a secret culture random password exists; if the judgment result is yes, adding the original information block and the first encrypted information block, and adding the password with the secret culture, adding the result to the a lower bit of the information block after quasi-encryption, if the judgment result is no, randomly generating the secret culture random encryption code, adding the original information block and the first encrypted information block, and randomly adding the secret culture block The password is added, and the result bit is stored in a lower bit of the quasi-encrypted information block; the second encrypted information block is The culture is randomly added with a password to add the result bit to the higher bit of the quasi-encrypted information block; the secret culture random encryption code is added to the second encrypted information block, and the result is stored back to the secret culture. a password; and encrypting the quasi-encrypted information block to obtain the encrypted information block; sequentially encrypting each of the original information blocks until the original information sequence is added Closed. The digital information encryption method according to claim 1, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a higher bit of the encrypted information block. The segment data is cut into the first encrypted information block, and the lower byte segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 1, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a lower bit of the encrypted information block. The meta-paragraph data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 1 or 2 or 3, wherein setting an initial ciphertext plus password to the encrypted information block includes setting a randomly generated initial ciphertext plus password to the encrypted Information box. The digital information encryption method according to claim 1 or 2 or 3, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a preset initial ciphertext plus password to the encrypted Information box. A digital information encryption method comprises: cutting an original information sequence into a number of original information blocks; determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information block and a After the second encrypted information block, if the judgment result is no, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second encrypted information block. Blocking; determining whether a secret culture random password exists; if the judgment result is yes, adding the original information block and the first encrypted information block, and adding the password with the secret culture, adding the result to the a higher bit of the information block after quasi-encryption, if the judgment result is no, randomly generating the secret culture random encryption code, adding the original information block and the first encrypted information block, and randomly adding the password with the secret culture Adding, storing the result bit to a higher bit of the quasi-encrypted information block; adding the second encrypted information block to the secret culture random encryption code, and storing the result bit to the quasi-encrypted information block a low-order element; the secret culture random encryption code is added to the second encrypted information block, and the result is stored back to the secret culture random encryption code; After the secret information block cryptographic operations to obtain information to the encrypted block; sequentially to each of the original information block is encrypted original information sequence until the encryption is complete. The digital information encryption method according to claim 6, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a higher bit of the encrypted information block. The segment data is cut into the first encrypted information block, and the lower bit segment data of the encrypted information block is cut into the second encrypted content. Information box. The digital information encryption method according to claim 6, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a lower bit of the encrypted information block. The meta-paragraph data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 6 or 7 or 8, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a randomly generated initial ciphertext plus password to the encrypted Information box. The digital information encryption method according to claim 6 or 7 or 8, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a preset initial ciphertext plus password to the encrypted Information box. A digital information encryption method includes: determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information block and a second encrypted information block, if the result is determined If not, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second encrypted information block; determining whether a secret culture random encryption password is Exist, if the judgment result is yes, add an original information block and the first encrypted information block, and add the password with the secret culture to add the result to the first The lower bit of the information block after quasi-encryption, if the judgment result is no, randomly generate the secret culture random encryption code, add the original information block and the first encrypted information block, and randomly add the password with the secret culture Adding, storing the result bit to a lower bit of the quasi-encrypted information block; adding the second encrypted information block to the secret culture random encryption code, and storing the result bit in the quasi-encrypted information block a higher bit; adding the secret culture random encryption code to the second encrypted information block, storing the result back to the secret culture random encryption password; and encrypting the quasi-encrypted information block to obtain the encrypted information Square. According to the digital information encryption method of claim 11, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a higher bit of the encrypted information block. The segment data is cut into the first encrypted information block, and the lower byte segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 11, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a lower bit of the encrypted information block. The meta-paragraph data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 11 or 12 or 13, wherein an initial ciphertext plus password is set as the encrypted information. The block includes setting a randomly generated initial ciphertext plus password as the encrypted information block. The digital information encryption method according to claim 11 or 12 or 13, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a preset initial ciphertext plus password to the encrypted Information box. A digital information encryption method includes: determining whether an encrypted information block exists, and if the determination result is yes, cutting the encrypted information block into a first encrypted information block and a second encrypted information block, if the result is determined If not, an initial ciphertext plus password is set as the encrypted information block, and the encrypted information block is cut into the first encrypted information block and the second encrypted information block; determining whether a secret culture random encryption password is Exist, if the judgment result is yes, adding an original information block and the first encrypted information block, and adding the password with the secret culture, and storing the result bit to a higher bit of the quasi-encrypted information block If the judgment result is no, the secret culture random encryption code is randomly generated, the original information block is added with the first encrypted information block, and the secret culture is added with a random password to add the result to a standard. The higher bit of the encrypted information block; the second encrypted information block is added to the secret culture random encryption code, and the result is stored The encrypted registration information block of the lower bits; the secret password stochastic culture after adding the second encrypted information block, stores the result back into the encrypted random tight culture; and The quasi-encrypted information block is subjected to an encryption operation to obtain the encrypted information block. The digital information encryption method according to claim 16, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a higher bit of the encrypted information block. The segment data is cut into the first encrypted information block, and the lower byte segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 16, wherein the encrypted information block is cut into the first encrypted information block and the second encrypted information block includes a lower bit of the encrypted information block. The meta-paragraph data is cut into the first encrypted information block, and the higher-order segment data of the encrypted information block is cut into the second encrypted information block. The digital information encryption method according to claim 16 or 17 or 18, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a randomly generated initial ciphertext plus password to the encrypted Information box. The digital information encryption method according to claim 16 or 17 or 18, wherein setting an initial ciphertext plus password to the encrypted information block comprises setting a preset initial ciphertext plus password to the encrypted Information box.