# Welcoming Cipher Puzzle

Please leave this puzzle for users with less than 200 rep.

Each of the following lines until the last provides a significant clue for solving the next cipher.

Letters have a natural order

C SEA WRA SA VTN YRE RP O RG SSE VI E UB TT H NE XE T PIC H RE SI

uifpwoehuwevjhtuxjpuhbma

531532133533154535414415

• I think this is a nice idea. Not sure why the early downvote?
– Stiv
Sep 27 '19 at 22:37
• @Stiv Thanks, it's the nature of a community-run site I guess Sep 27 '19 at 22:37
• But a new user from another active site will have 101 reps >< Sep 28 '19 at 2:40
• Leave it for <200 rep people.
– m4n0
Sep 28 '19 at 4:26
• I have 221, just barely over the cap. Starts singing It Sucks to be Me from Avenue Q Sep 28 '19 at 20:18

So, the first cipher is a

Transposition cipher. I'm not actually sure which: I looked at the frequency of the letters, and determined it was probably a transposition cipher on a message in english. Then I noticed by chance the word "Cipher" and "Caesar", which were both "locally permuted" (i.e. if you consider the letters of a word in the plaintext message, then they will be 'close' in the ciphertext). From there I read the cipher from left to right, and guessed the plaintext).

and the ciphertext decodes to

Caesar wasn't very progressive but the next cipher is

The second cipher is

a progressive Caesar cipher, where the first 3 letters are shifted by 1, the next 3 by 2, the next 3 by 3$$\dots$$

and the ciphertext decodes to

The numbers are coordinates

The last cipher is a

Polybius cypher with key: ABCDE FGHIJ KLMNO PQRST UVWXY

which yields

Welcome to PSE

Oh, and thanks for

the warm welcome :)

• Good job :) The first cipher is an Alphabetical Disorder Cipher. Simply order each group of letters alphabetically. Sep 29 '19 at 17:25
• Nice answer, well presented again!
– tom
Sep 29 '19 at 20:21