Sumitomo-Valmet SC2000 soft calender.

The Block Cipher SC2000

In this paper, we propose a new symmetric key block cipher SC2000 with 128-bit block length and 128-,192-,256-bit key lengths. The block cipher is constructed by piling two layers: one is a Feistel structure layer and the other is an SPN structure layer. Each operation used in two layers is S-box or logical operation, which has been well studied about security. It is a strong feature of the cip...

Colliding Keys for SC2000-256

In this work we present analysis for the block cipher SC2000 , which is in the Japanese CRYPTREC portfolio for standardization. In spite of its very complex and non-linear key-schedule we have found a property of the full SC2000-256 (with 256-bit keys) which allows the attacker to find many pairs of keys which generate identical sets of subkeys. Such colliding keys result in identical encryptio...

Fast Software Implementations of SC2000

The block cipher SC2000 was recently proposed by a research group of Fujitsu Laboratories as a candidate cipher for the CRYPTREC and NESSIE projects. The cipher was designed so that it would be highly flexible and fast on many platforms. In this paper we show that the cipher is really fast on the Pentium III and AMD platforms: Our C implementation of SC2000 on Pentium III is only second to the ...

Japanese Commercial Transactions and Sanctions Revisited: Sumitomo v. UFJ

Differential and Linear Cryptanalysis of a Reduced-Round SC2000

We analyze the security of the SC2000 block cipher against both differential and linear attacks. SC2000 is a six-and-a-half-round block cipher, which has a unique structure that includes both the Feistel and Substitution-Permutation Network (SPN) structures. Taking the structure of SC2000 into account, we investigate oneand two-round iterative differential and linear characteristics. We present...