Wei Wang

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In this paper, we present the first distinguishing attack on HMAC and NMAC based on MD5 without related keys, which distinguishes the HMAC/NMAC-MD5 from HMAC/NMAC with a random function. The attack needs 2 97 queries, with a success probability 0.87, while the previous distinguishing attack on HMAC-MD5 reduced to 33 rounds takes 2 126.1 messages with a(More)
Hamsi-256 is designed by¨Ozgül Kücük and it has been a candidate Hash function for the second round of SHA-3. The compression function of Hamsi-256 maps a 256-bit chaining value and a 32-bit message to a new 256-bit chaining value. As hashing a message, Hamsi-256 operates 3-round except for the last message it operates 6-round. In this paper, we will give(More)
In this paper, the impossible differential cryptanalysis is extended to MAC algorithms Pelican, MT-MAC and PC-MAC based on AES and 4-round AES. First, we collect message pairs that produce the inner near-collision with some specific differences by the birthday attack. Then the impossible differential attack on 4-round AES is implemented using a 3-round(More)
In this paper, we present new distinguishers of the MAC construction Alred and its specific instance Alpha-MAC based on AES, which is proposed by Daemen and Rijmen in 2005. For the Alred construction , we describe a general distinguishing attack which leads to a forgery attack directly. The complexity is 2 64.5 chosen messages and 2 64.5 queries with(More)
This paper presents a new distinguisher which can be applied to secret-prefix MACs with the message length prepended to the message before hashing. The new distinguisher makes use of a special truncated differential path with high probability to distinguish an inner near-collision in the first round. Once the inner near-collision is detected, we can(More)
This paper presents an improved impossible differential attack on the new block cipher CLEFIA which is proposed by Sony Corporation at FSE 2007. Combining some observations with new tricks, we can filter out the wrong keys more efficiently, and improve the impossible differential attack on 11-round CLEFIA-192/256, which also firstly works for CLEFIA-128.(More)
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