name: ECQV
full_form: Elliptic Curve Qu-Vanstone
context: ECQV based approach makes use of ECQV implicit certificate with a Keyed MAC, to function as a signature scheme. ECQV is currently being standardized in ANSI, as draft ANSI X9.123, and ECPVS signature which is similar to Keyed MAC is standardized in IEEE, ISO and ANSI, as well. The security of ECQV has been proven by [18], and the Keyed MAC (signature scheme) may be viewed as a variant of the signature scheme ECPVS, which itself is a variant of the Schnorr signature scheme. The Schnorr signature scheme has a security proof in the RO model. A security proof [19] for ECPVS would likely apply to the Keyed MAC signature scheme. Editor's Note: SAGE should confirm the security of the Keyed MAC signature scheme given the non universal composability of ECQV [20].
description: Elliptic Curve Qu-Vanstone (ECQV) is a cryptographic technique used for implicit certificates and digital signatures. It relies on elliptic curve cryptography and offers security proofs in the Random Oracle model.
explanation: ECQV is explicitly described as a cryptographic technique used for security purposes like digital signatures and implicit certificates, placing it firmly within the domain of cryptography.
section_title: 8.9.4	ECQV based
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