Abstract:

Based on security risks for RC4 algorithm,  we presented some improvements. The improved algorithm can resist the fault induction attack via adding the selferror detection phase, and resist Knudsen’s attack via adding the byte conversion phase. After analyzing the security of the improved algorithm, we proved that the improved algorithm can resist the fault induction attack and Knudsen’s attack validly, the security of the RC4 algorithm is hence enhanced.

Key words: RC4 algorithm； fault induction attack； Knudsen’s attack； selferror detection； byte conversion