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First outputs probabilities

 

 
Frequencies of occurrence of each of the possible 2^8 values on each of the first 256 byte-positions of the keystream generated by the VMPC Stream Cipher were measured.

[In "A Practical Attack on Broadcast RC4" Itsik Mantin and Adi Shamir show that the second output of RC4 takes on value 0 with probability 1/128 instead of 1/256.]

A test of 2^40.3 bytes generated by the VMPC Stream Cipher for 2^32.3 different keys showed that each of the possible 256 values on each of the first 256 positions is taken on with probability statistically insignificantly different from the expected 1 / 256.


by Bartosz Zoltak




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