Forgery above a Genuine Signature

Forgery Above a Genuine Signature

An improved decision criterion for genuine/forgery classification in on-line signature verification

We present a system for on-line handwritten signature verification. During enrollment, eight reference signatures are taken from each subject and statistics describing the variation in the user’s signatures are extracted from the cross alignment of these. A test signature’s authenticity is established by first aligning it with each reference signature for the claimed user. Then, using the align...

Recent Results on Signature Forgery

A weakness has been found in the ISO 9796 signature standard using RSA. The padding method proposed by the standard is the origin of the problem and will require probable changes in ISO 9796 parts 1 and 2. This weakness was discovered by Gemplus’ cryptography division and the ENS and UCL cryptography groups while implementing the standard. A paper reporting the problem will be presented at Cryp...

Rule Based Signature Verification and Forgery Detection

A rule based signature verification system has been devised based on Adaptive Network Based Fuzzy Inference System (ANFIS). The histogram of the angle differences along the signature trajectory is used as a descriptor of the signatures. We partition the histogram to obtain a number of rules, which is limited to 4 at a time. The performance of the proposed system is found to be satisfactory on t...

Universal forgery attack on a strong designated verifier signature scheme

Based on the bilinear Diffie-Hellman assumption, in 2009, Kang et al. proposed an identity-based strong Designated Verifier Signature (DVS) scheme which only allows the intended verifier to verify the signature. Besides, the designated verifier is not capable of transferring the conviction to any third party. Their scheme was proved secure in the random oracle model. In this paper, however, we ...