Abstract:

The security of encryption algorithms depends heavily on the computational infeasibility of brute force attack. Brute force attack on the RCA encrypti on algorithm is one of the research directions of cryptology. Software for the brute force attack on the RCA encryption algorithm is designed based on d  istributed computing. Brute force attack on the 40-bit RCA is realized in LANs and the velocity of attacking is tested. The test results show that RCA ＇s ability of resisting brute force attack is very weak. So RCA encryption is very unsafe.

Key words: brute force attack, distributed computing, stream cipher;RC4