Question

If a ciphertext is intercepted as follows: KSTPEIOEIEAYNMD, and you are highly confident that the Rail...

  1. If a ciphertext is intercepted as follows: KSTPEIOEIEAYNMD, and you are highly confident that the Rail Fence cipher is used here, (10 points)

(a). Find plaintext

(b). What is the key?

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Answer #1

(a). Plaintext is "KEYISONETIMEPAD"

(B). Key is 3

Explanation:

When key value is taken as 1, then we can't get the plaintext. So, the minimum key value required starts from 2.

When key value is 2:

when key is 2, the plaintext is "KISETAPYENIMODE" which doesn't make any sense. so the key value is not 2.

When key value is 3:

when key is 3, the plaintext is "KEYISONETIMEPAD". which has meaning to it. So 3 is our key value.

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