Certified E-Mail with Temporal Authentication: An Improved Optimistic Protocol. - Clemente Galdi; Raffaella Giordano (TrustBus, 2004)

Design and Implementation of an Inline Certified E-mail Service. - Stelvio Cimato; Clemente Galdi; Raffaella Giordano; Barbara Masucci; Gildo Tomasco (CANS, 2005)