[reitanqild]

Also interested.

Is there a general way to attack naive ciphers?

I fall of at even a proper Vigenère cipher, although I guess I could hack together a terribly inefficient python script to test all options and then print them line by line and start visually scanning for patterns :-/

[stcredzero]

Vigenère ciphers based on xor: xor the ciphertext with itself at varying offsets. Stop when you detect likely plaintext in the result.