International Association for Cryptologic Research

International Association
for Cryptologic Research


Quantum encryption with certified deletion

Anne Broadbent
Rabib Islam
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Abstract: Given a ciphertext, is it possible to prove the deletion of the underlying plaintext? Since classical ciphertexts can be copied, clearly such a feat is impossible using classical information alone. In stark contrast to this, we show that quantum encodings enable certified deletion. More precisely, we show that it is possible to encrypt classical data into a quantum ciphertext such that the recipient of the ciphertext can produce a classical string which proves to the originator that the recipient has relinquished any chance of recovering the plaintext should the key be revealed. Our scheme is feasible with current quantum technology: the honest parties only require quantum devices for single-qubit preparation and measurements; the scheme is also robust against noise in these devices.Furthermore, we provide an analysis that is suitable in the finite-key regime.
Video from TCC 2020
  title={Quantum encryption with certified deletion},
  booktitle={Theory of Cryptography},
  author={Anne Broadbent and Rabib Islam},