This may look like some random letters:
but with the knowledge of the correct key (in this case jsmHGSXRWJ unordered), the message is revealed!
But wait, there's more! You can hide more than one message! Using the same text jumble as before, but this time with the key jsmHGdeEFl:
I recommend using a regex (most text editors support it). Once regex is enabled, just put the key inside square brackets i.e. [jsmHGSXRWJ]
Due to character limitations, messages can only have a max of 6 words