Addend Dependency of Differential/Linear Probability of Addition

Hiroshi MIYANO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E81-A    No.1    pp.106-109
Publication Date: 1998/01/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Cryptography and Information Security)
common key cryptosystem,  differential cryptanalysis,  linear cryptanalysis,  RC5,  addition,  

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This letter gives a study of additionY=X+K mod 2w which is used in some cryptosystems as RC5. Our results enables us to express the differential and linear probability of addition as a function of addendK. To detect a good differential characteristics or linear approximation of a cryptosystem in which extended key is used as addend, we need to consider how the characteristics or approximations behave depending upon the value of the addend, which are clarified by our results.