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A Combinatorial Analysis of HC-128
Cryptography eSTREAM HC-128 Keystream State Recovery Stream Cipher
2010/7/14
We show that the knowledge of any one of the two internal state arrays of HC-128 along with the knowledge of 2048 keystream words is sufficient to construct the other state array completely in $2^{42}...
In this paper, we present a new distinguisher for HC-128
which is the best known so far. The distinguisher requires approximately
2106 keystream words with success probability 0.9772.
In this paper, we use linear approximations of the addition modulo 2n of three n-bit integers
to identify linear approximations of g1, g2, the feedback functions of HC-128. This, in turn, shows that
...