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Countering Digital Forensics: An Identity Based Ephemerizer Cryptosystem

Digital forensics rely on the ability to recover data stored in persistent storage of a machine, even if it has been tagged as being deleted. We consider one of the solutions proposed to counter such analysis and recovery storing the data in an encrypted form in the user’s machine and the key to decrypt the data in a physically separate machine. We discuss a scheme proposed to implement this and identify flaws and constraints associated with it. We then propose an alternate scheme based on identity-based cryptography that overcomes these constraints.