It’s a write-up about the challenge : Ringzer0CTF - Some Martian Message
Challenge 25 - Some Martian Message
1. Challenge
The first crypto challenge is :
SYNTPrfneVfPbbyOhgAbgFrpher
2. Solution
The first thing we tried is a caesar cipher decryption tool, on this website : http://www.xarg.org/tools/caesar-cipher/
This algorithm actually finds what kind of caesar encryption is used. We chose “guess” as the key, and it found 13. So, the result was similar to an rol13 encryption, it’s a Caesar cipher code.
The code is : FLAGCesarIsCoolButNotSecure