If anyone gets confused, just convert the back of the postcard from its hex values to the ascii characters; next, it's trivial to see the pattern of the message

If anyone gets confused, just convert the back of the postcard from its hex values to the ascii characters; next, it's trivial to see the pattern of the message. And do see if you can find the 7z archive on the front! P.S. Brush up on your security industry history =)