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IT Security and Cryptography


Prof. Dr.-Ing. Tibor Jager

News

  • Accepted paper at ACNS 2020
    The paper "Offline Witness Encryption with Semi-Adaptive Security" by Peter Chojka, Tibor Jager, and... [more]
  • Our group keeps growing
    Dr Gareth Davies, Dr Lin Lyu and Peter Chvojka have joined our group at University of Wuppertal on... [more]
  • New research result "On the Security of RSA-PSS in the Wild"
    The paper by Saqib A. Kavki was accepted for presentation at the Security Standardisation Research... [more]
  • Tibor Jager invited to the program committee of Crypto 2020
    Crypto is the leading international academic cryptology conference. [more]
  • Four new staff members join the group
    Dr Saqib A. Kakvi, Denis Diemert, Kai Gellert, and Rafael Kurek have joined University of Wuppertal... [more]
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New research result "On the Security of RSA-PSS in the Wild"

The paper by Saqib A. Kavki was accepted for presentation at the Security Standardisation Research Conference (SSR) 2019.

Digital signature schemes are often considered "in isolation" in cryptography. In practice, however, the same public key is often used for more than one scheme. Therefore classical security proofs do not apply.

This paper presents the first security proof for the important RSA-PSS and RSA-PKCS#1 v1.5 signature schemes that holds even if the same key pair is used for both schemes simultaneously.

This is a positive result that provides evidence that the re-use of keys, as done for instance by many Web servers on the Internet, is secure.