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Taxonomical Security Consideration of OAEP Variants

2006; Institute of Electronics, Information and Communication Engineers; Volume: E89-A; Issue: 5 Linguagem: Inglês

10.1093/ietfec/e89-a.5.1233

1745-1337

Yuichi Komano, Kazuo Ohta,

Semantic Web and Ontologies

We first model the variants of OAEP and SAEP by changing a construction and position of a redundancy, and establish a universal proof technique in the random oracle model, the comprehensive event dividing tree. We then make a taxonomical security consideration of the variants of OAEP and SAEP, based on the assumptions of one-wayness and partial-domain one-wayness of the encryption permutation, by applying the tree. Furthermore, we demonstrate the concrete attack procedures against all insecure schemes; we insist that the security proof failure leads to some attacks. From the security consideration, we find that one of the variants leads to a scheme without the redundancy; the scheme is not (plaintext aware) but IND-CCA2 secure. Finally, we conclude that some of them are practical in terms of security tightness and short bandwidth.