This problem explores the use of a one-time pad version of the Vigenere cipher.

Question

This problem explores the use of a one-time pad version of the Vigenere cipher. In this scheme, the key is a stream of random numbers between O and 26. For example, if the key is 3 19 5 ... , then the first letter of plaintext is encrypted with a shift of 3 lettters, the second with a shift of 19 letters, the third with a shift of 5 letters, and so on.

1. Encrypt the plaintext sendmoremoney with the key stream 2 9 0 1 7 23 15 21 14 11 11 2 8 9 using the ciphertext produced find a key so that the cipher text decrypts to the plaintext cashnotneeded.

Explanation / Answer

Ans : Encrypt the plaintext sendmoremoney with the key stream 2 9 0 1 7 23 15 21 14 11 11 2 8 9:

Using the ciphertext produced find a key so that the cipher text decrypts to the plaintext cashnotneeded :

s e n d m o r e m o n e y 18 4 13 3 12 14 17 4 12 14 13 4 24 9 0 1 7 23 15 21 14 11 11 2 8 9 1 4 14 10 9 3 12 18 23 25 15 12 7 B E C K J D M S X Z P M H

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