NETWORK SECURITY BY BLOCK CIPHERS

Provable Security for Block Ciphers by Decorrelation

Construction of Stream Ciphers from Block Ciphers and their Security

With well-established encryption algorithms like DES or AES at hand, one could have the impression that most of the work for building a cryptosystem -for example a suite of algorithms for the transmission of encrypted data over the internet is already done. But the task of a cipher is very specific: to encrypt or decrypt a data block of a specified length. Given an plaintext of arbitrary length...

Building Stream Ciphers from Block Ciphers and their Security

Security Evaluation of Light-weight Block Ciphers by Gpgpu

Nowadays, general purpose graphical processing unit (GPGPU) has been used in many ares. We use it for security evaluation of light-weight block ciphers. Light-weight block cipher is one of key technologies for small communication devices such as sensor network. To design a light-weight block cipher whose fastness and security are balanced, so that, its security margin should be evaluated exactl...

Performance and Security of Block Ciphers

We present a block cipher that has the best performance of all 64-bit block ciphers with the smallest proven di erential/linear probability 2 62 using the structure proposed by Matsui. One of features of his methodology is to use some power functions in GF (2 n ) with di erent n that are resistant to di erential and linear attacks. In this paper we discuss how to combine power functions x k in ...