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E={Ek | 0≤k<26}
Ek0,k1,…,k(r-1) (m0,m1,m2,…)=(c0,c1,c2,…)
Ek(m)=(m-k) mod 26, 0≤m<26
ci=(mi+k(i mod r)) mod 26
E={Ek0,k1,…,k(r-1)|(k0,k1,...,kr-1)∈K=Zr26}.
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