The comments about data havens have been interesting to read. Being
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Yes, this is the way to go. The data havens have a location that is a public key in cyberspace. Think of it as one entity placing an anonymous, untraceable classified ad in a newspaper, readable by many, and others placing ads in response. A two-way communication channel is thus opened up, without regard for the physical location of each, the nature of the communication, the data to be transferred, etc.
All of that is just detail.
Hmmm... then why use a data haven at all? Split the file into small pieces, encrypt each and post each piece in a newsgroups (the pieces may even be posted as small garbles of data in sigs?). When you need to recover the file checksites which archive those newsgroups. Just a thought. It's probably quite doable for small files. Another idea: use encryption/secret sharing combined with steganography and upload copies of the said files to various ftp-sties or BBS's. (It may be that this is more secure than data havens, since few SysAdmins would bother checking for steganographically hidden files...)
--Tim May
Rob