The flag is encrypted and then base64'd. Here it is: E2zVOQfaRwYoMiTapzA03RQJJmtq1KuHTCuWGdVo/+w=

To decrypt it you will need to implement the amazing Key Derivation Function called CictroKDF (not to be confused with the well-known CictroHash). After a key has been derived you can use it with AES ECB mode to decrypt the flag.

The message for the KDF is: Are you silly? I'm still gunna send it!!

Wrap the flag in RITSEC{}

Author: cictrone