On related RC4 pseudorandom number generators faults

This article contains more precise definitions of related pseudorandom number generators RC4 fault and derailment. Classification of faults is given. The set of possible fault combinations for $N-1$ RC4 pairs $g_{N-1,0}$ and $g_{N-1,\delta}$ ($\delta\in[1;N-1]$) at the time $t$ is defined. The probabilities of every fault combination are estimated.