The content of that message was more problematic than the one to Argent. Young and I didn't have much in the way of background; we certainly didn't have any codes in common as I did with Argent. My message had to meet two criteria. First, it had to identify me without using names. Second, it had to communicate my blind-drop address in code. And third, it had to contain the key to that code in such a way that only Sharon Young would recognize it as such and be able to decrypt the address.