Presentation	1999/11/9 Impossible Differential Attack to SAFER+ Hitoshi Imai, Toshinobu Kaneko,
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Abstract(in English)	SAFER+ is block cipher proposed by J.L.Massey et.al. Impossible differential attack is method shifting wrong keys out exhaustively. In this paper we exhibit a differential characters of exp,log function in SAFER+. We have performed impossible differential attack to 3 in 8 rounds SAFER+ with 16 byte-keys using the characters. As the result of attack using computer over one hour, we succeeded in narrowing down to 2 key candidates at most for each 5 in 16 byte-keys. Chosen plaintext-ciphertext pair we need are 2^<17> pairs.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	SAFER+ / differential attack / impossible differential attack
Paper #	ISEC99-73
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Conference Information
Committee	ISEC
Conference Date	1999/11/9(1days)
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Paper Information
Registration To	Information Security (ISEC)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Impossible Differential Attack to SAFER+
Sub Title (in English)
Keyword(1)	SAFER+
Keyword(2)	differential attack
Keyword(3)	impossible differential attack
1st Author's Name	Hitoshi Imai
1st Author's Affiliation	Department of Electronics Engineering, Science University of Tokyo()
2nd Author's Name	Toshinobu Kaneko
2nd Author's Affiliation	Department of Electronics Engineering, Science University of Tokyo
Date	1999/11/9
Paper #	ISEC99-73
Volume (vol)	vol.99
Number (no)	415
Page	pp.pp.-
#Pages	8
Date of Issue