Hi Tim,
I had some time today and I decided to try your challenges.
You said two hints, but I have actually found three. Those are imagine some cypher-text sequences to decrypt.
But for now , I am basically stuck there. I have tried to open the images with a text editor and found some ID inside it, which I thought to be a key, but it is not (or I do not know how to match them correctly).
Interesting. What did the ID say?
Okay I rephrase... I investigated the two hints. I have one key and one cyphertext for each. Now I am trying to go further but still cannot decrypt the text.
PS: I don't have neither paint nor any image manipulation program...
:D