Title:
COMMON KEY BLOCK ENCRYPTING DEVICE, ITS METHOD, ITS PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2008/053650
Kind Code:
A1
Abstract:
A common key block encrypting device for creating a block encryption having a large
block size by combining encryption exhibiting a high security and encryption exhibiting
high speed, its method, its program, and a recording medium are provided. When
blocks having large block sizes are encrypted, a plain text is processed by replacement
using a universal hash function, the processed plain text is encrypted by block
encryption having a high security for one block, and the output of a pseudo-random number
generator to which the sum of the input and the output of the block encryption is
inputted and the other blocks are added. Lastly, replacement using a universal hash
function is applied. If the block encryption used is secure against a selected encrypted
text attack and if the pseudo-random number generator is secure against a known
plain text attack, the security of the created block encryption against a selected
encrypted text is ensured. Even when the block size is large, the speed of the block
encryption is not a problem. The pseudo-random number generator and the speed
of the universal hash function become main.
More Like This:
Inventors:
MINEMATSU KAZUHIKO (JP)
Application Number:
PCT/JP2007/068622
Publication Date:
May 08, 2008
Filing Date:
September 26, 2007
Export Citation:
Assignee:
NEC CORP (JP)
MINEMATSU KAZUHIKO (JP)
MINEMATSU KAZUHIKO (JP)
International Classes:
G09C1/00
Foreign References:
| JP2000122534A | 2000-04-28 | |||
| JP2000502822A | 2000-03-07 | |||
| JP2004258667A | 2004-09-16 |
Attorney, Agent or Firm:
MARUYAMA, Takao (SAM Build. 3floor38-23, Higashi-Ikebukuro 2-chom, Toshima-ku Tokyo 13, JP)
Download PDF:
Previous Patent: WIDE ANGLE IMAGE ACQUIRING METHOD AND WIDE ANGLE STREO CAMERA DEVICE
Next Patent: SURFACE ACOUSTIC WAVE FILTER DEVICE AND DUPLEXER
Next Patent: SURFACE ACOUSTIC WAVE FILTER DEVICE AND DUPLEXER