On Oct 1, 2009, at 16:46, Perry E. Metzger wrote:
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.
Sorry, I should have clarified that. We don't want to verify that Bob has in fact deleted the patient record, we just want to verify whether Bob *claims* to have deleted the patient record *within the time span given*. If Alice later finds out that Bob has lied, she will have this signed claim, with which she can take him to court.
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