Information processing apparatus, information processing method, and program

• US 9,281,940 B2
• Filed: 02/07/2013
• Issued: 03/08/2016
• 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): REVAK, CHRISTOPHER A
• Application Number:
  US14/374,671
• Publication Number:
  US 20150039904A1
• Time in Patent Office: 1,125 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 2209/125 Parallelization or pipelining, e.g. for accelerating processing of cryptographic operations
• CPC Class Codes: H04L 9/0618 Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation

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 whitening key and 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, as a process according to a cryptographic algorithm Piccolo, 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 a 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 whitening key and a round key for each round to be used in a cryptographic process,

the cryptographic process in which the whitening key and the round key are 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 according to a cryptographic algorithm Piccolo by 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 plurality of registers 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 plurality of registers 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 plurality of registers as a unit, in the cryptographic process.

3. The information processing apparatus according to claim 1,

wherein the data processing unit changes an aspect of a linear conversion process of F functions of each round depending on a round number in the cryptographic process.

4. The information processing apparatus according to claim 1,

wherein the data processing unit executes a cryptographic process of setting a round keys to be input in each round to be different from setting defined in the cryptographic algorithm Piccolo, in the cryptographic process.

5. 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.

6. The information processing apparatus according to claim 5,

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

7. The information processing apparatus according to claim 5,

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

8. 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 a plurality of bit slice expression blocks stored in a plurality of registers, in the cryptographic process.

9. 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 whitening key and a round key for each round to be used in the decryption process,

a decryption process in which the whitening key and the round key are 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 according to a cryptographic algorithm Piccolo by 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.

10. The information processing apparatus according to claim 9,

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.

11. The information processing apparatus according to claim 9,

wherein the data processing unit changes an aspect of a linear conversion process of F functions of each round depending on a round number in the decryption process.

12. The information processing apparatus according to claim 9,

wherein the data processing unit executes a cryptographic process of setting a round keys to be input in each round to be different from setting defined in the cryptographic algorithm Piccolo, in the decryption process.

13. An information processing method which is a cryptographic process executed 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 a 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 whitening key and a round key for each round to be used in the cryptographic process,

the cryptographic process in which the whitening key and the round key are 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 data processing unit executes the cryptographic process according to a cryptographic algorithm Piccolo by 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.

14. An information processing method which is a decryption process executed 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 whitening key and a round key for each round to be used in the decryption process,

the decryption process in which the whitening key and the round key are 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 data processing unit executes the decryption process according to a cryptographic algorithm Piccolo by 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.

15. A non-transitory computer-readable storage medium having stored thereon, a set of computer-executable instructions for causing an information processing apparatus to execute 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 a 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 whitening key and a round key for each round to be used in the cryptographic process,

the cryptographic process in which the whitening key and the round key are 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 data processing unit executes the cryptographic process according to a cryptographic algorithm Piccolo by 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.

16. A non-transitory computer-readable storage medium having stored thereon, a set of computer-executable instructions for causing an information processing apparatus to execute 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 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 whitening key and a round key for each round to be used in the decryption process,

the decryption process in which the whitening key and the round key are 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 data processing unit executes the decryption process according to a cryptographic algorithm Piccolo by 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.