Hi,

It would be nice to have a possibility to check for encoded strings, data or code.

Just a quick look gives me:
https://github.com/hwhw/base64finder
https://digital-forensics.sans.org/blog/2013/05/14/tools-for-examining-xor-obfuscation-for-malware-analysis

This one is really cool:
http://www.kahusecurity.com/2014/exploring-xor-decryption-methods/

Just need to look in this direction.

Greetings