Rules:
[ul]
[li]No “uncrackable” ciphers are allowed, for example, one time pads and RSA style algorithms.[/li][li]The plaintext message must be at least ten characters long.[/li][li]The ciphertext message must contain only lower or upper case characters, digits and punctuation. No unprintable characters are allowed.[/li][li]If you are going to include a hint as to how to crack your cipher, please put it in a spoiler box.[/li][/ul]
I’ll go first with a very easy one.
XFMDPNF UP UIF TENC DJQIFS HBNF