I feel like this was part of a William Gibson short story (Johnny mnemonic maybe) where data gets encrypted with a key unknown to the bearer. The key is sent th

I feel like this was part of a William Gibson short story (Johnny mnemonic maybe) where data gets encrypted with a key unknown to the bearer. The key is sent through some channel unknown to the bearer. The bearer meets up with the key holders / some Dropbox location and decrypts data. The enhancement here would be some little unencrypted portion/vm so the bearer can play FarmVille in transit.