Vernam’s One Time pad using multiple short tapes————————————————tape1: 011tape2: 01011repeat:tape 1: 011011011011011|011tape 2: 010110101101011|01011 ———————combined: 001101110110000|001repeats after lcm(3,5) = 3*5/gcd(3,5) = 15 bitsS-box examples————–S1(111001)1 1100 111 1100 S1(11,1100) = 10S2(111001)11, 1100,S2(11,1100) = 0S1(010011) = 6
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