VMPC-R Cryptographically Secure Pseudo-Random Number Generator Alternative to RC4.
Bartosz Zoltak · 2013
Abstract. We present a new Cryptographically Secure Pseudo-Random Number Generator. It uses permutations as its internal state, similarly to the RC4 stream cipher. We describe a statistical test which revealed non-random patterns in a sample of 216.6 outputs of a 3-bit RC4. Our new algorithm produced 246.8 undistinguishable from random 3-bit outputs in the same test. We probed 251 outputs of the algorithm in different statistical tests with different word sizes and found no way of distinguishing the keystream from a random source. The size of the algorithm’s internal state is 23424 (for an 8-bit implementation). The algorithm is cryptographically secure to the extent we were able to analyse it. Its design is simple and easy to implement. We present the generator along with a key scheduling algorithm processing both keys and initialization vectors.