METHOD FOR ACTIVE CONTENT FINGERPRINTING

摘要

A method of providing robust and secure fingerprints including, at an enrollment stage, the steps of providing a content x for which a fingerprint is to be provided, assigning an ID number to the content x, providing a secret key k, generating a fingerprint bx based on content x and secret key k, storing the generated fingerprint bx together with the assigned ID in a database, as well as, at an identification stage, the steps of extracting, for a given query content y which might result either from the enrolled content x or an unrelated content x′, an estimate fingerprint by based on content y, and secret key k, producing an estimated I{hacek over (D)} number based on the estimate fingerprint by for identifying the content x using said ID number stored in the database, or else rejecting the query.

主权项

1. A method of providing a robust and secure fingerprint comprising, at an enrolment stage, the steps of:
(a) providing a content x∈XN for which a fingerprint is to be provided, (b) assigning an ID number to said content x, (c) providing a secret key k∈K, (d) generating a fingerprint bx∈BL based on content x and secret key k by use of a mapping of the general form ψ:XN×K→BL, (e) storing the generated fingerprint bx together with the assigned ID in a database, and, at an identification stage, the steps of (f) extracting, for a given query content y which might result either from the enrolled content x or an unrelated content x′∈XN, an estimate fingerprint by based on content y, and secret key k by use of a mapping of the general form g:YN×K→BL, (g) producing an estimated I{hacek over (D)} number based on said estimate fingerprint by for identifying the content x using said ID number stored in the database, or else rejecting the query, wherein generating the fingerprint bx, comprises the step of (h) modulating the content x in a space of secret carriers of a transform domain defined by the key k by use of a mapping of the general form ψ:XN×K→BL×VN such as to produce a modulated content vector v∈XN,said content v replacing content x and being adapted to be used during the identification stage in steps (f) and (g).