日時：　9月25日(木)　15:00-17:00

場所：　知識科学研究科講義棟　中講義室

講演者氏名：　黒澤　馨(くろさわ かおる)
茨城大学 工学部 情報工学科　教授

講演内容：

 In the first part, we study some RSA-based semantically secure encryption schemes (IND-CPA) in the standard model. We first derive the exactly tight one-wayness of Rabin-Paillier encryption scheme which assumes that factoring Blum integers is hard. We next propose the first IND-CPA scheme whose one-wayness is equivalent to factoring {\it general} $n=pq$. In the second part, we present One-key CBC MAC (OMAC) and prove its security for arbitrary length messages. OMAC takes only one key, $K$ ($k$ bits) of a block cipher $E$. Previously, XCBC requires three keys, $(k+2n)$ bits in total, and TMAC requires two keys, $(k+n)$ bits in total, where $n$ denotes the block length of $E$.

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