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Can you solve this coding puzzle?

If:

RAIL = KCTN

and

SPEAK = CGRUM

then

AVOID = ?

Please explain your answer.

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2 Answers 2

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Then:

AVOID = KQXCF

We use the following cipher:

ROT2 (Caesar cipher with shift 2) 

Plaintext:  abcdefghijklmnopqrstuvwxyz
Ciphertext: CDEFGHIJKLMNOPQRSTUVWXYZAB

But there's a twist! We:

Start from the second-last letter in the word, go backwards from there and finally add the last letter of the word, then cipher.

I.e.:

RAIL  -> IARL  -> KCTN
SPEAK -> AEPSK -> CGRUM
AVOID -> IOVAD -> KQXCF

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  • $\begingroup$ It's almost like reverse igpay atinlay. $\endgroup$
    – LeppyR64
    Commented Sep 19, 2017 at 11:53
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    $\begingroup$ I feel like somewhere a teacher is gonna read this word for word, not here though. $\endgroup$
    – Walfrat
    Commented Sep 19, 2017 at 13:59
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The answer is

KQXCF

Because

All the letters of the word are written in reverse order except the last letter of word and in the group of letters so obtained. Then, each letter is moved 2 steps forward to get the code.

RAIL = IARL = KCTN

SPEAK = AEPSK = CGRUM

AVOID = IOVAD = KQXCF

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  • $\begingroup$ I'm sorry, but this is almost identical to my answer $\endgroup$
    – boboquack
    Commented Sep 19, 2017 at 9:48
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    $\begingroup$ @boboquack . Yes, he has literally copied your answer. I think that he was trying to make your answer in such a way that everyone could understand it. But I will still say it is a copy of your answer $\endgroup$
    – user160598
    Commented Sep 19, 2017 at 11:00

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