The Random-Block Feedback Mode for Block Ciphers

Yoonjeong KIM  Yookun CHO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.6   pp.1289-1291
Publication Date: 2000/06/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
block ciphers,  differential cryptanalysis,  linear cryptanalysis,  exhaustive key search,  random-block feedback,  

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In this letter we propose a new mode for block ciphers which uses an unknown random block as feedback. We show that the successful differential/linear cryptanalyses of DES under the mode require at least the complexity of the exhaustive key search. We also present the processing overhead of our scheme compared to that of ECB mode.