Present 

• Editorial board member of IEEE Security & Privacy, 2021-. 
• Editorial board member of Mathematical Cryptology, 2020-. 
• Editorial board member of Bulletin of the ICA, 2016-. 
• Editorial board member of Advances in Mathematics of Communications, 2012-. 
• Editorial board member of Contributions to Discrete Mathematics, 2005-.

Past

• Program committee member of Indocrypt 2024 (Chennai).
• Program committee member of ECC 2024 (Taipei)
• Program committee member of Indocrypt 2023 (Goa). 
• Steering committee member of the annual Workshop on Elliptic Curve Cryptography.  
• Program committee member of Indocrypt 2022 (Kolkata). 
• Program committee member of Indocrypt 2021 (Jaipur).  
• Program committee member of MathCrypt 2021 (virtual). 
• Program committee member of ECC 2020 (virtual). 
• Editorial board member of Journal of Mathematical Cryptology, 2006-2019. 
• Program committee member of ECC 2019 (Bochum). 
• Program committee member of MathCrypt 2019 (Santa Barbara). 
• Editorial board member of IEEE Transactions on Information Theory, 2015-2018. 
• Program committee member of MathCrypt 2018 (Santa Barbara). 
• Program committee member of Mycrypt 2016 (Kuala Lumpur). 
• Program committee member of Latincrypt 2015 (Guadalajara). 
• Program committee member of SECITC 2015 (Bucharest). 
• Scientific committee member of ECC 2014 (Chennai). 
• General chair of PQCrypto 2014 (Waterloo). 
• Co-program chair (with Diego Aranha) of Latincrypt 2014 (Florianopolos). 
• Local organizer for Algebraic Combinatorics: Spectral Graph Theory, Erdos-Ka-Rado Theorems and Quantum Information Theory (Waterloo). 
• Webmaster for The Kovalevskaia Fund. 
• Scientific committee member of ECC 2013 (Leuven). 
• Program committee member of SAC 2013 (Burnaby). 
• Accreditation board member of Computer & Communications Security Abstracts, 1999-2012. 
• Scientific committee member of ECC 2012 (Queretaro). 
• Program committee member of Asiacrypt 2011 (Korea). 
• Scientific committee member of ECC 2011 (Nancy). 
• Program committee member of Eurocrypt 2011 (Estonia). 
• Program committee member of Indocrypt 2010 (Hyderabad). 
• Program committee member of IWSEC 2010 (Kobe). 
• Program committee member of ISC 2010 (Boca Raton). 
• Program committee member of Latincrypt 2010 (Puebla). 
• Program committee member of PKC 2010 (Paris). 
• Program committee member of Africacrypt 2010 (Cape Town). 
• Program committee member of Cryptography and Coding (Cirencester). 
• Program committee member of Indocrypt 2009 (New Delhi). 
• Program committee member of IWSEC 2009 (Toyama). 
• Program committee member of ASIACCS ’09 (Sydney). 
• Program committee member of Indocrypt 2008 (Kharagpur). 
• Program committee member of Pairing 2008 (London). 
• Program committee member of Eurocrypt 2008 (Istanbul). 
• Member of the Canada Research Chairs College of Reviewers, 2002-. 
• Program committee member of Cryptography and Coding (Cirencester). 
• Program chair of Crypto 2007 (Santa Barbara). 
• Program committee member of PKC 2007 (Beijing). 
• Organizing committee member of the Thematic Program in Cryptography, The Fields Institute, Toronto. 
• Program committee member of Asiacrypt 2005 (Chennai). 
• Editorial board member of Designs, Codes and Cryptography, 1996-2005. 
• Program chair of CT-RSA 2005 (San Francisco). 
• Program committee member of Indocrypt 2004 (Chennai). 
• Program committee member of SAC 2004 (Waterloo). 
• Program committee member of PKC 2004 (Singapore). 
• Program committee member of Indocrypt 2003 (New Delhi). 
• Program committee member of SAC 2003 (Ottawa). 
• Program committee member of ACISP 2003 (Wollongong). 
• Co-Program chair (with Palash Sarkar) of Indocrypt 2002 (Hyderabad). 
• Program committee member of Asiacrypt 2002 (Queenstown). 
• Program committee member of AD-HOC Networks and Wireless (ADHOC-NOW) (2002, Toronto). 
• Program committee member of Crypto 2002 (Santa Barbara). 
• Program committee member of CT-RSA 2002 (San Jose). 
• Program committee member of Indocrypt 2001 (Chennai). 
• Organizing committee member of Sixth International Conference on Finite Fields and Applications (Fq6) (Oaxaca). 
• Program committee member of Indocrypt 2000 (Kolkata). 
• Program committee member of Asiacrypt 2000 (Kyoto). 
• Program committee member of Eurocrypt 2000 (Bruges). 
• Member of the NSERC Applied Mathematics Grant Selection Committee (1997-2000).