If the one-time pad cipher (Figure 31.12 in the text) is the simplest and most secure cipher,

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If the one-time pad cipher (Figure 31.12 in the text) is the simplest and most secure cipher, why is it not used all of the time?

Figure 31.12

Random sequence bit generator Secure key-exchange channel k;1 bit I bit k; I bit 1 bit Encryption Pi I bit Decryption I bit Insecure channel

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