MITM II: Electric Boogaloo
Crypto : 200

Chisa and Arisu are trying to tell each other two halves of a very important secret! They think they're safe, because they know how cryptography works---but can you learn their terrible, terrible secret? They're available as services at 54.186.6.201:12346 and 54.186.6.201:12345 respectively.

http://bostonkeyparty.net/challenges/mitm2-632e4ecc332baba0943a0c6471dec2c6.tar.bz2