Privacy Protecting Protocols for Revocable Digital Signatures. - István Zsolt Berta; Levente Buttyán; István Vajda (CARDIS, 2004)

Mitigating the Untrusted Terminal Problem Using Conditional Signatures. - István Zsolt Berta; Levente Buttyán; István Vajda (ITCC (1), 2004)

A Framework for the Revocation of Unintended Digital Signatures Initiated by Malicious Terminals. - István Zsolt Berta; Levente Buttyán; István Vajda (IEEE Trans. Dependable Secur. Comput., 2005)

Using Multiple Smart Cards for Signing Messages at Malicious Terminals. - István Zsolt Berta (ISC, 2006)