- Association for Computing Machinery (ACM), 1996 – 2021 (senior member since 2006)
- Institute of Electrical and Electronics Engineers (IEEE), 1996 – 2021 (senior member since 2012)
- IEEE Computer Society, 1996 – 2021
- International Association for Cryptologic Research (IACR), 2003 – 2015
- International Federation for Information Processing (IFIP)
- Technical Committee 11 (TC 11)
- Working Group 4 (WG4) on Network Security, former vice-chair