All-or-Nothing Transform Based on a Linear Code

Hidenori KUWAKADO  Hatsukazu TANAKA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A   No.5   pp.1084-1087
Publication Date: 2002/05/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Discrete Mathematics and Its Applications)
cryptography,  information security,  all-or-nothing transform,  encryption mode,  linear code,  

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An all-or-nothing transform (AONT), which has been proposed by Rivest, is one of encryption modes. The AONT is intended to increase the cost of brute-fore attacks on a block cipher. This paper provides the revised definition of an unconditionally secure AONT, and shows the instance of an optimal unconditionally secure AONT. In addition, we propose a computationally secure AONT such that any information on a message cannot be obtained regardless of the position of the lost block due to a linear code.