random number
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... KEXINIT message
1. C generates a random number x (1 < x < q) and computes e = g^x
mod p.
...
... client.
4. S generates a random number y (0 < y < q) and computes f = g^y
mod p. It computes K = e ^ y mod p, and H = hash(V_C || V_S ||
...