Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
AUTHENTICATION ENCRYPTION METHOD, AUTHENTICATION DECRYPTION METHOD, AND INFORMATION-PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/027454
Kind Code:
A1
Abstract:
 The present invention provides an information-processing device for efficiently realizing an authentication cryptogram in which an increase in the bandwidth (length) of a ciphertext length relative to a plaintext length is small. The information-processing device is provided with: a plaintext input unit for inputting plaintext; an initial vector generation unit for generating an initial vector; a common key block encryption unit for performing common key block encryption on the initial vector and generating an encrypted initial vector; a pseudorandom number generation unit which, accepting the encrypted initial vector as input, generates a pseudorandom number series in the same length as the plaintext; a keyed hash unit which, accepting the first portion of a ciphertext in which the pseudorandom number series and the plaintext are exclusive-OR'ed as input, generates a hash value; and a ciphertext output unit for concatenating the second and first portions of a ciphertext in which the hash value and the encrypted initial vector are exclusive-OR'ed and outputting the concatenated portions as a ciphertext.

Inventors:
MINEMATSU KAZUHIKO (JP)
Application Number:
JP2015/004099
Publication Date:
February 25, 2016
Filing Date:
August 18, 2015
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NEC CORP (JP)
International Classes:
H04L9/18; G09C1/00
Foreign References:
JPS6410750A1989-01-13
JP2008122967A2008-05-29
JP2012151805A2012-08-09
Other References:
MORRIS DWORKIN: "Recommendation for Block Ciper Modes of Operation: Galois/Counter Mode (GCM) and GMAC", NIST SPECIAL PUBLICATION 800-38D, 2007.11, COMPUTER SECURITY, pages 1 - 31, Retrieved from the Internet [retrieved on 20151028]
CHAE HOON LIM: "Message Encryption and Authentication Using One-Way Hash Functions", PROC. OF 3RD ANNUAL WORKSHOP ON SELECTED AREAS IN CRYPTOLOGY (SAC '96), August 1996 (1996-08-01), pages 1 - 11, Retrieved from the Internet [retrieved on 20151028]
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Download PDF: