We propose a new Public Key Infrastructure model for long-term signatures. It is based on X.
509 and the real world of handwritten signatures. In the model, notaries certify that a signer's …

We observe that current mainstream digital signature schemes are complex and
inconvenient for end users. We group the main problems related to these schemes and …

Featured Application The results of this work will be included in a Technical Annex to the
Agency for Digital Italy's Guidelines for the creation, management and preservation of digital …

Electronic archives are increasingly being used to store information that needs to be
available for a long time such as land register information and medical records. In order for …

While X. 509 Public Key Infrastructures (PKIs) and X. 509 Attribute Certificates (ACs) enforce
strong authentication and authorization procedures (respectively), they do not give the user …

Este trabalho tem como objetivo propor e implementar um novo conceito de certificado: o
Certificado Otimizado, base da Infraestrutura de Chaves Publicas Otimizadora. Trata-se de …

Guarantee of authenticity, integrity and datedness is necessary to rely on digital data
objects. In literature, there are several solutions which offer these guarantees in the long …

ABSTRACT Optimized Public Key Infrastructures are traditional PKI in which end users may
optimize the signatures of their documents, replacing the signer's validation data with …