> It is also completely impossible to prove you've deleted a > record. Someone who can read the record can always make a copy > of it. Cryptography can't fix the DRM problem.
If, and only if, the document lives solely within an airtight surveillance system, then it is possible to prove deletion. Put differently, only within airtight surveillance will the absence of evidence be the evidence of absence. In factually, if not politically, correct terms, the Electronic Health Record is the surest path to a surveillance state, but I digress. --dan --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majord...@metzdowd.com