Level: Medium
Description:
I just learned about an encryption algorithm that is impossible to break, so I will give you the ciphertext because I know that you can't break it. In fact, I'm so confident that you can't crack it that I'm willing to tell you I used my password as the secret key!
`SKWDHAICUG`
Flag format - `byuctf{ANENGLSHPHRSE}`
Using a list of common passwords to brute force the secret key will reveal that the password qwertyuiop gives a ciphertext COSMOCOUGR.
Flag - byuctf{COSMOCOUGR}