Summary
|
For Full-Text PDF, please login, if you are a member of IEICE, or go to Pay Per View on menu list, if you are a nonmember of IEICE. |
|
Evaluation of the Security of RC6 against the χ2-Attack Atsuko MIYAJI Yuuki TAKANO Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Vol.E90-A No.1 pp.22-28 Publication Date: 2007/01/01 Online ISSN: 1745-1337 DOI: 10.1093/ietfec/e90-a.1.22 Print ISSN: 0916-8508 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Symmetric Cryptography Keyword: block cipher, RC6, χ2-attacks, Full Text: PDF(183.6KB)>>
Summary: Knudsen and Meier applied the χ2-attack to RC6. The χ2-attack recovers a key by using high correlations measured by χ2-value. Up to the present, the success probability of any χ2-attack has not been evaluated theoretically without using experimental results. In this paper, we discuss the success probability of χ2-attack and give the theorem that evaluates the success probability without using any experimental result, for the first time. We make sure the accuracy of our theorem by demonstrating it on both 4-round RC6 without post-whitening and 4-round RC6-8. We also evaluate the security of RC6 theoretically and show that a variant of the χ2-attack is faster than an exhaustive key search for the 192-bit-key and 256-bit-key RC6 with up to 16 rounds. As a result, we succeed in answering such an open question that a variant of the χ2-attack can be used to attack RC6 with 16 or more rounds. | ||||||||||
| ||||||||||
