5
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NOTE:
Though the body is identical to I am both lock and key - who am I?, a different answer is expected, and thus this is not a duplicate.
Cyrnfr qb abg pybfr guvf dhrfgvba.
Thanks!

Enter! Small or large, as the case may be

I'll assist you - it's easy! - I'm both lock and key

Who am I?

HINTS:

1

Gur nafjre vf bs yratgu svir

2

Weet bksa, co vhyudt, mu qhu qbb cqhhyut, unsufj oek qdt jxqj tkbb rhejxuh mxe xqhtbo sxqdwui qj qbb!

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  • 1
    $\begingroup$ Can anyone please tell me why is this downvoted? It is my original idea of "Same riddle Different Answer" Question. Thanks! $\endgroup$ – Omega Krypton Dec 23 '18 at 11:27
  • $\begingroup$ I upvoted to counter the downvote ;) $\endgroup$ – Mr Pie Apr 2 at 0:47
  • $\begingroup$ thanks @user477343 $\endgroup$ – Omega Krypton Apr 2 at 1:11
4
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All in all, @Shahriar and @rhsquared, had it all. I just joined their answer and added an explanation for hints.


I think the answer is

ROT13

Enter! Small or large, as the case may be

ROT13 can work on both "small" and "large" case

I'll assist you - it's easy! - I'm both lock and key

ROT13 is both lock and key in the sense that a text "encrypted" with ROT13 can be decrypted by applying a new ROT13 operation.

Hint 1

ROT13 has 5 characters

Hint 2

"Good luck, my friend, we are all married, except you and that dull brother who hardly changes at all!" All ROTxx is "maried" with ROT[26-xx] except for ROT13 married with himself, and ROT0, who doesn't change the text at all.

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  • $\begingroup$ Well done! Wanna upvote but couldn't, reached daily upvote limit... Will do so tmr! $\endgroup$ – Omega Krypton Dec 24 '18 at 10:30
  • $\begingroup$ sorry for this super late +1, here you go ;) $\endgroup$ – Omega Krypton Feb 17 at 15:27
3
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The answer is-

ROT13

Because-

It's both the encryption method and decryption method for hiding plaintext.

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  • $\begingroup$ You havent explained the first line and the second line of the body. Keep it up! $\endgroup$ – Omega Krypton Dec 23 '18 at 9:55
2
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Considering that you used:

both Rot13 and Rot10 in you puzzle and hints I would say the answer is Rot16 in order to match the requirement for 5 letter length.

Enter! Small or large, as the case may be

The Rotxx encryption works on both caps (large) and small letters.

I'll assist you - it's easy! - I'm both lock and key

With the ROT encryption/decryption you can both encode and decode the text. We only need to keep in mind that only Rot13 is 'symetrical'. In all the rest the lock/key pair the sum of the Rotxx + Rotyy is 26. Considering that Hint 2 can be decoded using Rot10, I think the answer is its missing counterpart Rot16.

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  • $\begingroup$ on the right track, but who in the lot am i specifically asking for? by the way, you already have all info needed. keep it up! $\endgroup$ – Omega Krypton Dec 23 '18 at 23:40
  • $\begingroup$ edited hint 2 pls check $\endgroup$ – Omega Krypton Dec 24 '18 at 7:04

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