KR101148560B1 - Apparatus and method for encryption using mixture of bit data - Google Patents

Abstract

A method and apparatus for encrypting data represented by bits, the encryption apparatus using a bit combination sequence according to an embodiment of the present invention, a bit selection unit for selecting a bit of a predetermined area from the bit string of the data to be encrypted, the selected A first encryption unit for generating a first encrypted data by performing a logical operation on a bit string repeatedly including a bit and a bit string of the data to be encrypted, a converter for converting the selected bit into an arbitrary code, and the arbitrary code The second encrypted data is inserted into the predetermined region of the bit stream of the first encrypted data, and the first encrypted data into which the arbitrary code is inserted is recombined according to a pattern format corresponding to the additionally inserted pattern code. And a second encryption unit to generate.

Description

Cryptographic method and device using bit combination order {APPARATUS AND METHOD FOR ENCRYPTION USING MIXTURE OF BIT DATA}

The technical field relates to a method and apparatus for encrypting data represented in bits.

Since cryptography has been widely used in economics and finance, it has been widely used for authentication of identity, key management, digital signature, and identity verification. .

Encryption techniques are often used to ensure the safety of message transmission. Encryption techniques include encrypting plaintext on the transmission side and decrypting ciphertext on the receiving side. Data Encryption Standard (DES) is a block-by-block encryption protocol adopted as standard by many countries and the American National Standards Institute (ANSI). Other encryption protocols include 3-DES and AES (Advanced Encryption Standard).

Decryption can also be done by neglecting decryption keys, predictability of passwords, or monitoring of keyboard input on the network. Decryption techniques include Ciphertext Only Attack, Known Plaintext Attack, Chosen Plaintext Attack, Adaptive Chosen Plaintext Attack, and Timing attack. And DPA (or 'power analysis') attacks.

The present invention provides an encryption apparatus and method using a fast bit combination sequence by reducing the complicated operation process required for encryption / decryption through exclusive OR operation of data, arbitrary code conversion, and recombination of bits using a pattern format. .

In addition, the present invention provides an encryption apparatus and method using a bit combination sequence that can quickly cope with a security incident such as security key leakage or decryption by changing the pattern code table in which the pattern format is stored.

According to an embodiment of the present invention, an encryption apparatus using a bit combination order includes a bit selector that selects a bit of a predetermined area from among a bit string of data to be encrypted, a bit string repeatedly including the selected bit, and a bit of the data to be encrypted. A first encryption unit configured to logically operate on a column to generate primary encrypted data, a converting unit converting the selected bit into an arbitrary code, and converting the arbitrary code into the predetermined region among the bit strings of the primary encrypted data. And a second encryption unit for inserting the first encrypted data into which the arbitrary code is inserted and recombining the additionally encoded pattern code according to a pattern format corresponding to the inserted pattern code to generate the second encrypted data. Any code may indicate the recombination order of the primary encrypted data inserted.

The first encryption unit may include a bit string generator that generates a continuous bit string by repeating the selected bit by the same size as the data to be encrypted.

The first encryption unit may perform an exclusive OR operation on the bit string including the selected bit and the data to be encrypted.

The converter may convert the selected bit into a gray code.

The second encryption unit may include an insertion unit for inserting the arbitrary code into the primary encrypted data.

The second encryption unit may include a pattern format determination unit that determines the pattern format from the pattern code table using the pattern code, and may reassemble primary encrypted data into which the arbitrary code is inserted, according to the determined pattern format. have.

In addition, the encryption apparatus using the bit combination order according to another embodiment of the present invention may further include a pattern code storage unit for storing the pattern code table.

The pattern format may be distinguished by pattern code bits included in the pattern format.
The second encryption unit may secondly encrypt the first encrypted data, into which the arbitrary code is inserted, in a plurality of pattern formats according to the pattern code.

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The plurality of pattern formats may be distinguished by adding ID bits to the second encrypted data.

In addition, the encryption apparatus using the bit combination order according to another embodiment of the present invention may further include an additional information processing unit for giving additional information in addition to the data to be encrypted to the second encrypted data.

The pattern may include at least one information pattern or a false information pattern.

In an encryption method using a bit combination order according to an embodiment of the present invention, selecting a bit of a predetermined region from among a bit string of data to be encrypted, a bit string repeatedly including the selected bit, and a bit string of the data to be encrypted. Generating a primary encrypted data by logical operation, converting the selected bits into an arbitrary code, and inserting the arbitrary code into the predetermined region of the bit string of the primary encrypted data, And recombining the primary encrypted data having the code inserted therein according to the pattern format corresponding to the inserted pattern code to generate the secondary encrypted data, wherein the pattern format includes the primary having the arbitrary code inserted therein. Recombination order of encrypted data can be indicated.

The primary encryption may include generating a continuous bit string by repeating the selected bit by the same size as the data to be encrypted.

The primary encryption may perform an exclusive OR operation on the bit string including the selected bit and the data to be encrypted.

The second encrypting step may include inserting the arbitrary code into the first encrypted data.
The second encrypting step may include determining the pattern format from the pattern code table using the pattern code, and recombine the first encrypted data into which the arbitrary code is inserted according to the determined pattern format. have.

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In addition, the encryption method using a bit combination order according to another embodiment of the present invention may further include the step of giving additional information in addition to the data to be encrypted to the second encrypted data.

The present invention provides an encryption apparatus and method using a fast bit combination sequence by reducing the complicated computational process required for encryption / decryption through exclusive OR operation of data, arbitrary code conversion, and recombination of bits using a pattern format. Can be.

In addition, the present invention can provide an encryption apparatus and method using a bit combination sequence that can be quickly responded to security incidents such as security key leakage or decryption by changing the pattern code table in which the pattern format is stored. .

1 is a block diagram of an encryption apparatus using a bit combination order according to an embodiment of the present invention.
2 is a view showing the format of a pattern according to an embodiment of the present invention.
3 is a view showing an example of a pattern code table according to an embodiment of the present invention.
4 is a view showing another example of a pattern code table according to an embodiment of the present invention.
5A and 5B illustrate a specific example of applying an encryption apparatus using a bit combination order according to an embodiment of the present invention.
6A and 6B illustrate another example of applying an encryption apparatus using a bit combination order according to an embodiment of the present invention.
7 is a flowchart illustrating an encryption method using a bit combination order according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Encryption apparatus using a bit combination sequence according to an embodiment of the present invention does not require a complicated operation, it can be used in a low specification smartphone, PDA, mobile phone can have a strong security. In addition, in the fields of barcode RFID, online document forgery, tampering and user authentication, it is possible to respond to security incidents quickly by changing the pattern code table.

1 is a block diagram of an encryption apparatus using a bit combination order according to an embodiment of the present invention.

Referring to FIG. 1, an encryption apparatus using a bit combination order according to an embodiment of the present invention may include a bit selector 110, a first encryption unit 120, a conversion unit 130, and a second encryption unit 140. The pattern code storage unit 150 and the additional information processing unit 160 are included.

The bit selector 110 selects a bit of a predetermined area among data to be encrypted. The data to be encrypted can be represented in bits through ASCII code conversion. The predetermined area means a partial area of data expressed in bits. The predetermined area may be arbitrarily set by the user. In addition, the predetermined area may be preset for each area in consideration of the encryption speed of the data. The predetermined area set in consideration of the predetermined area arbitrarily set by the user and the encryption speed may be controlled by a controller (not shown).

The first encryption unit 120 generates the first encrypted data by performing a logical operation on the bit string including the selected bit and the data to be encrypted. The first encryption unit 120 may include a bit string generator 121. The bit string generator 121 may generate a bit string having the same size as the data to be encrypted by repeatedly arranging the bits selected by the bit selector 110. In addition, the first encryption unit 120 may perform an exclusive OR operation on the bit string including the bit selected by the bit selector 110 and the data to be encrypted. That is, the first encryption unit 120 may perform an exclusive OR operation on the bit string having the same size as the data to be encrypted and the data to be encrypted by repeatedly arranging the selected bits.

The converter 130 converts the bit selected by the bit selector 110 into an arbitrary code. The converter 130 may convert the selected bit into an arbitrary code based on a specific code conversion method. In addition, the conversion unit 130 may convert the selected bit into an arbitrary code based on a code conversion set randomly in the code table. For example, the converter 130 may convert the selected bit into a gray code using a gray code conversion equation or a gray code conversion table.

The second encryption unit 140 generates the second encrypted data by recombining the first encrypted data and any code according to the pattern format for the bit combination order. The second encryption unit 140 may include an insertion unit 141. The inserter 141 may insert any code converted by the converter 130 into the first encrypted data. The inserter 141 may insert an arbitrary code into a predetermined region where a bit is selected by the bit selector 110. In addition, the second encryption unit 140 may include a pattern format determination unit 143. The pattern type determination unit 143 may determine the pattern type from the pattern code table by using the pattern code. The pattern code can be determined by the user. Also, the pattern code can be determined randomly. The second encryption unit 140 may recombine the primary encrypted data and any code according to the pattern format determined by the pattern format determination unit 143. The pattern format defines the order in which bits are combined and can be distinguished by pattern code bits. In addition, the pattern may be divided into an information pattern indicating a combination order of bits and a false information pattern added to the information pattern so that it is difficult to decrypt.

In addition, the second encryption unit 140 may secondly encrypt the first encrypted data and the arbitrary codes in a plurality of pattern formats according to the pattern code. The plurality of pattern forms mean a plurality of cipher texts. If the pattern format stored in the pattern code table is a plurality of pattern formats using the pattern code, the second encryption unit 140 may secondly encrypt the first encrypted data and an arbitrary code with a plurality of cipher texts. Here, the plurality of pattern formats may be distinguished by adding ID bits to the second encrypted data. The distinguishing of the plurality of pattern formats is that the pattern format to be applied to the secondary encryption and the pattern format to be applied later are distinguished. The order may be determined according to the size of the ID bit. The ID bit may include at least one bit.

The pattern code storage unit 150 may store a pattern code table. The pattern code table stores information on the pattern format. The pattern code table may mean a database of pattern types classified by a kind of pattern code. The pattern type determination unit 143 may determine a pattern type corresponding to the pattern code from the pattern code table stored in the pattern code storage unit 150. The second encryption unit 140 may recombine the primary encrypted data and any code according to the pattern format determined by the pattern format determination unit 143. By changing the pattern code table stored in the pattern code storage unit 150, it is possible to quickly cope with a security incident.

The additional information processor 160 may add additional information to the second encrypted data in addition to the data to be encrypted to the second encrypted data. The additional information can be given in such a manner as to generate additional bits in the secondary encrypted data. The additional information may include information about whether the pattern code table is a one-time use, the number of times the encrypted data can be decrypted, the period in which the data can be decrypted, and the access authority.

In addition, operations of the bit selector 110, the first encryption unit 120, the converter 130, and the second encryption unit 140 may be controlled by a controller (not shown). In addition, the bit selector 110, the first encryption unit 120, the conversion unit 130, and the second encryption unit 140 may be included in one processor.

2 is a view showing the format of a pattern according to an embodiment of the present invention.

Referring to FIG. 2, the pattern format according to an embodiment of the present invention may include a slice, a code, and an ID. The ciphertext is the same as the pattern. A slice refers to a bit piece divided into arbitrary sizes for recombination of encrypted data. Code is a code value for selecting a pattern format from the pattern code table. When encrypting data with more than one ciphertext, more than one pattern format can be used. In this case, an ID is added to the pattern format and may be used as a distinguishing number for distinguishing each pattern. In addition, the pattern may be largely composed of an information pattern and a false information pattern. The information pattern is a pattern used to encrypt actual information. The false information pattern is a pattern containing arbitrary false information to make decryption difficult.

Referring to FIG. 2, (A) shows a case where the data is encrypted in one pattern format. (B) shows the case of encryption in two pattern formats. In the case of (A) and (B), the pattern format consists of a slice 210 and codes 220, 230, 250, 280. In the case of (B), ID bits 240, 260, 270 and 290 are added.

Commonly in the case of (A) and (B), since the data is encrypted by the sequence of slices, codes, and IDs, the slices, codes, and IDs do not need to have a fixed position or have a constant size. In the pattern format stored in the pattern code table, the total number of bits of each pattern type, the assigned ID, and the number of bits of the code are the same. In the same pattern code table, the code and ID bit positions are the same, and the order of combining the slices is different. That is, the pattern format stored in the pattern code table is a form in which the sequence of combining slices is different and can be distinguished by code values. In the pattern format, the code bits may be disposed adjacent to each other consecutively, or may be divided and disposed at different positions for each bit.

In the case of (B), a plurality of pattern formats may be provided as many as can be represented by the added ID bits. The ID bits are divided and placed in different positions for each bit. The code bits may be divided into information patterns constituting the pattern and inserted one bit each. Any value can be entered in the false information pattern.

3 is a view showing an example of a pattern code table according to an embodiment of the present invention.

Referring to FIG. 3, a pattern format in the case of generating one cipher text is shown in the pattern code table. The pattern code is represented by two bits A and B, and is disposed in bit number 16 320 and bit number 23 310 in the pattern format. Since two bits may represent four cases, the pattern format may be represented by four cases in which a combination order of slices is different. Referring to FIG. 3, the pattern format includes a total of 29 bits, the 23rd bit and the 16th bit are used as code bits, and can be distinguished into four cases by the combination order of the remaining 27 bits. In this case, the combination order of 27 bits may be arbitrarily set by the user or randomly.

4 is a view showing another example of a pattern code table according to an embodiment of the present invention.

Referring to FIG. 4, the pattern code table shows a pattern format in the case of generating two cipher texts. The pattern may include an information pattern and a false information pattern. The information pattern is a pattern used to encrypt actual information. The false information pattern is a pattern containing arbitrary false information to make decryption difficult. The pattern code is represented by two bits A and B, and is disposed in bit number 9 412 and bit number 9 415 in the pattern format. In the case of forming two ciphertexts, one code bit may be disposed in each pattern format. In addition, an ID bit is added. The ID bit may be used to distinguish each cipher text when forming a plurality of cipher texts. Arbitrary bits may be disposed in the false information pattern.

Referring to FIG. 4, the information pattern and the false information pattern are composed of 17 bits, bit number 13 (411, 414, 417) and bit number 3 (413, 416, 419) may be used as ID bits, and bit number 9 (412, 415, 418) may be used as code bits. Therefore, the pattern format may be determined through a combination order of 14 bits except 3 bits among 17 bits. Since two ciphertexts are generated, one code bit may be placed 412 and 415 in each ciphertext. Since two bits, A and B, are allocated as code bits, a pattern format of four cases (00, 01, 10, 11) can be generated.

5A and 5B illustrate a specific example in which an encryption apparatus using a bit combination order according to an embodiment of the present invention is applied.

The data to be encrypted through the encryption apparatus using the bit combination order according to an embodiment of the present invention is an alphabetic character CODE. When the alphabetic character CODE is converted into an ASCII code, C is converted to 1000011, O is 1101111, D is 1100100, and E is 1100101. (A) shows the result of conversion to the ASCII code of the data code. Therefore, the data CODE may be represented by a total of 28 bits.

The bit selector 110 can select a bit from the bit number 18 to the bit number 22 (510) as a predetermined region in the data of (B). The bit string generator 121 may generate the bit string 520 including 28 bits by repeating the selected bit 510. In operation (B), the first encryption unit 120 may perform an exclusive OR operation (XOR) on the data and the bit string. The result of the exclusive OR operation is shown in the XOR result of (B).

The converter 130 converts the selected bit 510 into an arbitrary code. In FIG. 5A, an example in which the converter 130 converts the selected bit 510 into the gray code 530 is illustrated. The converter 130 may take the leftmost bit as it is with respect to the selected bit 1111, and convert the remaining bit into a gray code by performing an exclusive OR operation with the left bit. Accordingly, the gray code converted by the converter 130 is 10001 (530). The insertion unit 141 may insert the gray code 530 into the result of performing the exclusive OR operation on the first encryption unit 120. The position where the gray code 530 is inserted is a predetermined region 540 of the bit selected by the bit selector 110. (C) shows the result of the exclusive OR operation in the first encryption unit 120 and the gray code 530. (D) shows the result of the gray code 530 being inserted into the result of the exclusive OR operation performed by the first encryption unit 120.

5B illustrates a case in which one cipher text is generated by the determined pattern format by determining the pattern format according to the pattern code. When the pattern code is determined in the pattern code table, the pattern type determiner 143 may determine the pattern type according to the determined pattern code. The pattern code may be determined by the user or may be determined randomly. (E) shows the pattern format when the pattern code is determined to be 01 in the pattern code table of FIG. The pattern format consists of 30 bits, and bit number 24 and bit number 17 are used as the pattern code bits. The resulting value in (D) can be recombined in the order of 0 to 27 in (E). (F) shows the result of recombination of the resultant value of (D) in the order of (E).

6A and 6B illustrate another example of applying an encryption apparatus using a bit combination order according to an embodiment of the present invention.

6A and 6B illustrate a pattern format determined according to a pattern code after passing through the processes of (A), (B), (C) and (D) in FIG. Indicates when it is created. If the pattern code is determined to be 00 in the pattern code table of FIG. 4, the pattern type determination unit 143 may determine a pattern type corresponding to the pattern code. When a plurality of cipher texts are generated, the pattern may include an information pattern and a false information pattern. In (A), the pattern is composed of two information patterns and one false information pattern. The two information pattern formats can be distinguished by ID bits. Each information pattern format is composed of 17 bits and may include two ID bits and one code bit. Thus, the overall information pattern format may consist of 34 bits and include 4 ID bits and 2 code bits. Twenty eight bits can be used for the combination order of bits. Bits placed in the false information pattern format are arbitrary bit values and have no special meaning. In the information pattern, bit number 13 and bit number 3 are used as ID bits, and bit number 9 is used as code bits. (B) is a result value of (D) in FIG. 5A, and shows a result of the gray code 530 being inserted into the result of performing the exclusive OR operation in the first encryption unit 120. That is, (B) represents the data to be recombined. The second encryption unit 140 may recombine the first encrypted data and the gray code according to the determined pattern format. That is, the second encryption unit 140 may recombine the data of (B) according to the pattern format determined in (A). (C) shows the result of recombination of the data of (B) by the information pattern. (D) shows the result of adding the false information pattern of (A) to the result of (C). False information patterns can be added to the information pattern as a dummy, making it difficult to decrypt.

7 is a flowchart illustrating an encryption method using a bit combination order according to an embodiment of the present invention.

In operation 710, the encryption apparatus using the bit combination order according to an embodiment of the present invention selects a bit of a predetermined area from among data to be encrypted. The predetermined area means a partial area of data expressed in bits. The predetermined area may be arbitrarily set by the user. In addition, the predetermined area may be preset for each area in consideration of the encryption speed of the data.

In operation 720, the encryption apparatus using the bit combination order according to an embodiment of the present invention repeats the selected bit by the same size as the data to be encrypted to generate a continuous bit string. Creating a bit string with the same size as the data to be encrypted is to perform an exclusive OR operation.

In operation 730, the encryption apparatus using the bit combination order according to an embodiment of the present invention generates a primary encrypted data by performing a logical operation on a bit string including the selected bit and the data to be encrypted. Here, the logical operation may include an exclusive OR operation (XOR).

In operation 740, the encryption apparatus using the bit combination order according to an embodiment of the present invention converts the selected bit into an arbitrary code. At this time, the arbitrary code may include a gray code. The encryption apparatus using the bit combination order according to an embodiment of the present invention may bring the leftmost bit as it is to the selected bit, and convert the remaining bit into a gray code by performing an exclusive OR operation with the left bit.

In operation 750, the encryption apparatus using the bit combination order according to an embodiment of the present invention inserts the arbitrary code into the first encrypted data. At this time, any code may include a gray code.

In operation 760, the encryption apparatus using the bit combination order according to an embodiment of the present invention determines the pattern type from the pattern code table using the pattern code. The pattern code can be determined by the user. Also, the pattern code can be determined randomly. In the pattern code table, pattern types are classified according to pattern codes. Therefore, when the pattern code is determined, the pattern format according to the pattern code is also determined.

In operation 770, the encryption apparatus using the bit combination order according to an embodiment of the present invention generates the second encrypted data by recombining the first encrypted data and the arbitrary code according to the pattern format for the bit combination order. do. Secondary encrypted data may be generated by recombining the primary encrypted data and the arbitrary code according to an information pattern. In this case, the information pattern may be determined by the pattern format of the pattern code table.

In addition, the encryption apparatus using the bit combination order according to an embodiment of the present invention may give additional information other than the data to be encrypted to the second encrypted data. The additional information may include information about whether the pattern code table is a one-time use, the number of times the encrypted data can be decrypted, the period in which the data can be decrypted, and the access authority.

In addition, the data encrypted by the encryption device using the bit combination order according to an embodiment of the present invention can be decrypted through the reverse process of encryption. That is, if the pattern code and the information on the pattern format are known with the pattern format as a key, the encrypted data can be decrypted. The information added to the encrypted data includes information about any one of the number of decryption attempts, a decryption period, and an access right, thereby making it difficult to decrypt or decrypt.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

110: bit selector
120: first encryption unit
130: conversion unit
140: second encryption unit
150: pattern code storage unit
160: additional information processing unit

Claims (18)

A bit selector which selects bits of a predetermined area from among bit strings of data to be encrypted;
A first encryption unit configured to logically operate on the bit string repeatedly including the selected bit and the bit string of the data to be encrypted, to generate first encrypted data;
A converting unit converting the selected bit into an arbitrary code; And
Inserting the arbitrary code into the predetermined region of the bit string of the primary encrypted data, and recombining the primary encrypted data having the arbitrary code inserted therein according to a pattern format corresponding to the additionally inserted pattern code; A second encryption unit for generating secondary encrypted data,
The pattern format is characterized in that it represents the recombination order of the primary encrypted data in which the arbitrary code is inserted
Encryption device using bit combination order. The method of claim 1,
The first encryption unit
A bit string generator for generating a continuous bit string by repeating the selected bit by the same size as the data to be encrypted
Encryption apparatus using a bit combination sequence comprising a. The method of claim 1,
The first encryption unit
And an exclusive OR operation on the bit string including the selected bit and the data to be encrypted. The method of claim 1,
The conversion unit
And encrypting the selected bits into gray codes. The method of claim 1,
The second encryption unit
Inserting unit for inserting the arbitrary code into the primary encrypted data
Encryption apparatus using a bit combination sequence comprising a. The method of claim 1,
The second encryption unit
A pattern format determination unit for determining the pattern format from the pattern code table using the pattern code,
Recombining the primary encrypted data into which the arbitrary code is inserted according to the determined pattern format
Encryption device using bit combination order. The method of claim 6,
Pattern code storage unit for storing the pattern code table
Encryption apparatus using a bit combination sequence further comprising. The method of claim 1,
The pattern format is
And a bit code sequence included in the pattern format. The method of claim 1,
The second encryption unit
And encrypting the first encrypted data into which the arbitrary code is inserted in the plurality of pattern formats according to the pattern code. 10. The method of claim 9,
The plurality of pattern formats
And an ID bit is added to the second encrypted data and distinguished from each other. The method of claim 1,
An additional information processor for adding additional information to the secondary encrypted data in addition to the data to be encrypted;
Encryption apparatus using a bit combination sequence further comprising. The method of claim 1,
The pattern format is
At least one information pattern or false information pattern
Encryption apparatus using a bit combination sequence comprising a. Selecting a bit of a predetermined region from a bit string of data to be encrypted;
Generating a first encrypted data by performing a logical operation on a bit string repeatedly including the selected bit and a bit string of the data to be encrypted;
Converting the selected bit into an arbitrary code; And
Inserting the arbitrary code into the predetermined region of the bit string of the primary encrypted data, and recombining the primary encrypted data having the arbitrary code inserted therein according to a pattern format corresponding to the additionally inserted pattern code; Generating secondary encrypted data,
The pattern format is characterized in that it represents the recombination order of the primary encrypted data in which the arbitrary code is inserted
Encryption method using bit combination order. The method of claim 13,
The first encryption step
Generating a continuous bit string by repeating the selected bits by the same size as the data to be encrypted.
Encryption method using a bit combination sequence comprising a. The method of claim 13,
The first encryption step
And performing an exclusive OR operation on the bit string including the selected bit and the data to be encrypted. The method of claim 13,
The second encryption step
Inserting the arbitrary code into the primary encrypted data
Encryption method using a bit combination sequence comprising a. The method of claim 13,
The second encryption step
Determining the pattern format from the pattern code table using the pattern code,
Recombining the primary encrypted data having the arbitrary code inserted therein according to the determined pattern format
Encryption method using bit combination order. The method of claim 13,
Giving additional information to the secondary encrypted data in addition to the data to be encrypted
Encryption method using a bit combination sequence further comprising.

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