Information processing apparatus, information processing method, and program

• US 9,209,968 B2
• Filed: 02/07/2013
• Issued: 12/08/2015
• Est. Priority Date: 03/02/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Matsuda, Seiichi, Moriai, Shiho
• Primary Examiner(s): Hoffman, Brandon
• Assistant Examiner(s): TRUONG, THONG P
• Application Number:
  US14/374,942
• Publication Number:
  US 20150010146A1
• Time in Patent Office: 1,034 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 2209/24 Key scheduling, i.e. generating round keys or sub-keys for block encryption
• CPC Class Codes: H04L 9/005 for timing attacks
• CPC Class Codes: H04L 9/0816 Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use

Abstract

Speed-up of a cryptographic process by software (program) is realized. A data processing unit which executes a data process according to a program defining a cryptographic process sequence is included, and the data processing unit, according to the program, generates a bit slice expression data based on a plurality of plain text data items which are encryption process targets and a bit slice expression key based on a cryptographic key of each plain text data item, generates a round key based on the bit slice expression key, executes the cryptographic process including operation and movement processes of a block unit of the bit slice expression data, and an operation using the round key, and generates the plurality of encrypted data items corresponding to the plurality of plain text data items by the reverse conversion of the data with respect to the cryptographic process results.

Claims

1. An information processing apparatus comprising:

a data processing unit which executes a data process according to a program defining a cryptographic process sequence,

wherein the data processing unit, according to the program, executes

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to plain text data which is an encryption process target,

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the plain text data,

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the cryptographic process,

a cryptographic process in which the round key is applied with respect to the bit slice expression data, and

a reverse data conversion process of generating encrypted data corresponding to the plain text data, by performing reverse conversion of the bit slice process with respect to the result of the cryptographic process, and

executes the cryptographic process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each plain text data configuring the bit slice expression data in the cryptographic process, and herein n is a power of 2.

2. The information processing apparatus according to claim 1,

wherein the data processing unit

executes a process of storing a bit slice expression data block configured with the plain text data in a register as a processing unit, in the data conversion process,

executes a process of storing a bit slice expression key block configured with the same orders of bits or bits at every n bits of each cryptographic key configuring the bit slice expression key, in the register as a processing unit, in the key conversion process, and herein n is a power of 2, and

executes the cryptographic process using an operation process and a movement process of the block unit using the bit slice expression data block and the bit slice expression key block stored in the register as a unit, in the cryptographic process.

3. The information processing apparatus according to claim 1,

wherein the data processing unit

executes a process of dispersing and storing a bit slice expression data block configured with the plain text data in a plurality of registers as a processing unit, in the data conversion process, and

performs the cryptographic process by executing an operation process between the plurality of registers with respect to the bit slice expression data block stored in the plurality of registers and a shifting and shuffling process of each register storage block, in the cryptographic process.

4. The information processing apparatus according to claim 3,

wherein the data processing unit further executes an unpacking process of re-storing a block selected from the storage blocks of the plurality of registers in one register, in the cryptographic process.

5. The information processing apparatus according to claim 3,

wherein the data processing unit executes a round key operation defined in the cryptographic process sequence, by executing an exclusive-OR operation (XOR) with the round key in the register unit configuring the plurality of registers for storing the bit slice expression data blocks, in the cryptographic process.

6. The information processing apparatus according to claim 3,

wherein the data processing unit executes a nonlinear conversion process (Sbox) defined in the cryptographic process sequence, by executing an operation according to a predetermined logical command example with respect to the bit slice expression blocks stored in the plurality of registers, in the cryptographic process.

7. The information processing apparatus according to claim 1,

wherein the data processing unit executes the cryptographic process according to a cryptographic algorithm PRESENT, according to a program, in the cryptographic process.

8. An information processing apparatus comprising:

a data processing unit which executes a data process according to a program defining a decryption process sequence,

wherein the data processing unit, according to the program, executes

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to encrypted data which is a decryption process target,

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the encrypted data,

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the decryption process,

a decryption process in which the round key is applied with respect to the bit slice expression data, and

a reverse data conversion process of generating plain text data corresponding to the encrypted data, by performing reverse conversion of the bit slice process with respect to the result of the decryption process, and

executes the decryption process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each encrypted data item configuring the bit slice expression data in the decryption process, and herein n is a power of 2.

9. The information processing apparatus according to claim 8,

wherein the data processing unit executes a process of storing a bit slice expression data block configured with the encrypted data in a register as a processing unit, in the data conversion process,

executes a process of storing a bit slice expression key block configured with the same orders of bits or bits at every n bits of each cryptographic key configuring the bit slice expression key, in the register as a processing unit, in the key conversion process, and herein n is a power of 2, and

executes a decryption process using an operation process and a movement process of the block unit using the bit slice expression data block and the bit slice expression key block stored in the register as a unit, in the decryption process.

10. The information processing apparatus according to claim 8,

wherein the data processing unit executes a process of dispersing and storing a bit slice expression data block configured with data of the same orders of bits of the encrypted data, in a plurality of registers as a processing unit, in the data conversion process, and

executes an operation process between the plurality of registers with respect to the bit slice expression data block stored in the plurality of registers and a shifting and shuffling process of each register storage block, in the decryption process.

11. The information processing apparatus according to claim 10,

wherein the data processing unit executes an unpacking process of re-storing a block selected from the storage blocks of the plurality of registers in one register, in the decryption process.

12. An information processing method which is performed in an information processing apparatus, the method causing a data processing unit of the information processing apparatus, according to a program defining a cryptographic process sequence, to execute:

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to plain text data which is an encryption process target;

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the plain text data;

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the cryptographic process;

a cryptographic process in which the round key is applied with respect to the bit slice expression data; and

a reverse data conversion process of generating encrypted data corresponding to the plain text data, by performing reverse conversion of the bit slice process with respect to the result of the cryptographic process,

wherein the cryptographic process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each plain text data configuring the bit slice expression data is executed in the cryptographic process, and herein n is a power of 2.

13. An information processing method which is performed in an information processing apparatus, the method causing a data processing unit of the information processing apparatus, according to a program defining a decryption process sequence, to execute:

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to the encrypted data which is a decryption process target;

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the encrypted data;

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the decryption process;

a decryption process in which the round key is applied with respect to the bit slice expression data; and

a reverse data conversion process of generating plain text data corresponding to the encrypted data, by performing reverse conversion of the bit slice process with respect to the result of the decryption process,

wherein the decryption process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each encrypted data item configuring the bit slice expression data is executed in the decryption process, and herein n is a power of 2.

14. A program stored on a non-transitory computer-readable medium which causes an information processing apparatus to perform a cryptographic process comprising:

causing a data processing unit of the information processing apparatus to execute

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to plain text data which is an encryption process target,

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the plain text data,

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the cryptographic process,

a cryptographic process in which the round key is applied with respect to the bit slice expression data, and

a reverse data conversion process of generating encrypted data corresponding to the plain text data, by performing reverse conversion of the bit slice process with respect to the result of the cryptographic process,

wherein the cryptographic process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each plain text data configuring the bit slice expression data is executed in the cryptographic process, and herein n is a power of 2.

15. A program stored on a non-transitory computer-readable medium which causes an information processing apparatus to perform a decryption process comprising:

causing a data processing unit of the information processing apparatus to execute

a data conversion process of generating bit slice expression data by performing a bit slice process with respect to the encrypted data which is a decryption process target,

a key conversion process of generating a bit slice expression key by performing a bit slice process with respect to each cryptographic key of the encrypted data,

a key scheduling process of inputting the bit slice expression key to generate a round key for each round of the decryption process,

a decryption process in which the round key is applied with respect to the bit slice expression data, and

a reverse data conversion process of generating plain text data corresponding to the encrypted data, by performing reverse conversion of the bit slice process with respect to the result of the decryption process,

wherein the decryption process using an operation process and a movement process of a bit slice expression data block unit configured with the same orders of bits or bits at every n bits of each encrypted data item configuring the bit slice expression data is executed in the decryption process, and herein n is a power of 2.