Bit Independence Criterion Extended to Stream Ciphers

State convergence in bit-based stream ciphers

Well-designed initialisation and keystream generation processes for stream ciphers should ensure that each key-IV pair generates a distinct keystream. In this paper, we analyse some ciphers where this does not happen due to state convergence occurring either during initialisation, keystream generation or both. We show how state convergence occurs in each case and identify two mechanisms which c...

Comparison of 256-bit stream ciphers

This paper evaluates and compares several stream ciphers that use 256-bit keys: counter-mode AES, CryptMT, DICING, Dragon, Fubuki, HC-256, Phelix, Py, Py6, Salsa20, SOSEMANUK, VEST, and YAMB.

Stream ciphers and the eSTREAM project

Stream ciphers are an important class of symmetric cryptographic algorithms. The eSTREAM project contributed significantly to the recent increase of activity in this field. In this paper, we present a survey of the eSTREAM project. We also review recent time/memory/data and time/memory/key trade-offs relevant for the generic attacks on stream ciphers.

Stream ciphers

Stream Ciphers