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Title:
MESSAGE AUTHENTICATION CODE CALCULATION DEVICE, MESSAGE AUTHENTICATION CODE CALCULATION METHOD, AND MESSAGE AUTHENTICATION CODE CALCULATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2011/155039
Kind Code:
A1
Abstract:
A message authentication code calculation algorithm having a favorable calculation efficiency and high safety is configured. A value (M) corresponding to communication data is divided into i-pieces of values (p) having m-n-bit length, and among the values, i-1-pieces of values (p) are added with a secret key (k) having n-bit length (S110 to S130). A fixed value (IV1) having n-bit length and a value (p[1]||k[1]) having m-bit length are input to a compressibility function (h) to obtain a value (c[1]) having n-bit length (S140). By sequentially using j=2 to i-1, a value (c[j-1]) having n-bit length and a value (p[j]||k[j]) having m-bit length are input to the compressibility function (h) to obtain a value (c[j]) having n-bit length (S141). A fixed value (IV2) having n-bit length and a value (p[i]||c[i-1]) having m-bit length are input to the compressibility function (h) to obtain a value (c[i]) having n-bit length, and the value (c[i]) is output as a message authentication code of the value (M) (S142, S150).

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Inventors:
SORIMACHI TORU (JP)
Application Number:
PCT/JP2010/059818
Publication Date:
December 15, 2011
Filing Date:
June 10, 2010
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
SORIMACHI TORU (JP)
International Classes:
H04L9/32
Domestic Patent References:
WO2006019152A12006-02-23
Other References:
FERGUSON, N. ET AL.: "Helix Fast Encryption and Authentication in a Single Cryptographic Primitive", LECTURE NOTES IN COMPUTER SCIENCE, vol. 2887, 2003, pages 330 - 346
NAITO, Y. ET AL.: "How to Construct Cryptosystems and Hash Functions in Weakened Random Oracle Models", CRYPTOLOGY EPRINT ARCHIVE, REPORT 2009/550, 16 November 2009 (2009-11-16)
Attorney, Agent or Firm:
MIZOI, Shoji (JP)
Shoji Mizoi (JP)
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