Quantum Encryption with Certified Deletion

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Functionality

This functionality allows encryption of classical data into a quantum ciphertext so that the recipient of the ciphertext can produce a deletion certificate (a classical string) which proves to the originator that the recipient can no longer obtain the original plaintext should the decryption key be revealed.

A Certified Deletion Encryption (CDE) scheme usually consists of the following 5 algorithms:

  • KeyGen: This algorithm generates the key used in later stages
  • Enc: This algorithm encrypts the classical plaintext into a quantum ciphertext
  • Dec: This algorithm decrypts the quantum ciphertext to recover the classical plaintext
  • Del: This algorithm deletes the ciphertext and generates a deletion certificate
  • Ver: This algorithm verifies the deletion certificate

Properties

  • Decryption-correctness: Given the ciphertext and the associated key, the probability that Dec does not output the correct plaintext is negligible in the security parameter
  • Verification-correctness: Given a valid deletion certificate and its associated key, the probability that Ver does not accept the certificate is negligible in the security parameter
  • Certified Deletion Security: Once the deletion certificate is issued, it becomes impossible to decrypt the certificate, even if the key is later leaked.

Protocols

References