Revocable Quantum Digital Signatures

ePrint Report: Revocable Quantum Digital Signatures

Tomoyuki Morimae, Alexander Poremba, Takashi Yamakawa

We study digital signatures with revocation capabilities and show two results. First, we define and construct digital signatures with revocable signing keys from the LWE assumption. In this primitive, the signing key is a quantum state which enables a user to sign many messages and yet, the quantum key is also revocable, i.e., it can be collapsed into a classical certificate which can later be verified. Once the …

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