Phi(121) = 11*10 = 110 1000 Mod 110 = 1000 - 990 = 10 2^1000 Mod 121 = 2^10 Mod 121 In the following everything is Mod 121: 2^7 = 128 = 7 2^10 = 7 * 2^3 = 56
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