Title:
BLOCK ENCRYPTION DEVICE, DECRYPTION DEVICE, ENCRYPTION METHOD, DECRYPTION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2012/105352
Kind Code:
A1
Abstract:
This block encryption device comprises a stirring means (101) for applying substitution of a universal hash function base to (n+m)-bit plaintext and generating an n-bit first intermediate variable and an m-bit second intermediate variable; a first unit block encryption means (102) for using an encryption function of an n-bit block code having an m-bit adjustment value to encrypt the first intermediate variable with the second intermediate variable as an adjustment value, and generating an m-bit third intermediate variable and an (n-m)-bit fourth intermediate variable; a second unit block encryption means (103) for using the encryption function to generate an n-bit fifth intermediate variable by encrypting an n-bit intermediate variable that combines the second intermediate variable and the fourth intermediate variable with the third intermediate variable as an adjustment value; and a reverse stirring means (104) for applying reverse substitution of a universal hash function base to the result of combining the third intermediate variable and the fifth intermediate variable and generating an (n+m)-bit code cipher.
Inventors:
MINEMATSU KAZUHIKO (JP)
Application Number:
PCT/JP2012/051326
Publication Date:
August 09, 2012
Filing Date:
January 23, 2012
Export Citation:
Assignee:
NEC CORP (JP)
MINEMATSU KAZUHIKO (JP)
MINEMATSU KAZUHIKO (JP)
International Classes:
G09C1/00
Domestic Patent References:
| WO2010024003A1 | 2010-03-04 | |||
| WO2010024004A1 | 2010-03-04 | |||
| WO2009020060A1 | 2009-02-12 |
Foreign References:
| JP2007034212A | 2007-02-08 |
Attorney, Agent or Firm:
MIYAZAKI, Teruo et al. (JP)
Akio Miyazaki (JP)
Akio Miyazaki (JP)
Download PDF:
Claims: