Present

• Program committee member of Indocrypt 2024 (Dec 18-21 2024, Chennai).
   
• Program committee member of ECC 2024 (Oct 28-Nov 1, Taipei)
   
• 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 2023 (Dec 10-13 2023, Goa).
   
• Steering committee member of the annual Workshop on Elliptic Curve Cryptography. 
   
• Program committee member of Indocrypt 2022 (Dec 10-14 2022, Kolkata).
   
• Program committee member of Indocrypt 2021 (Dec 12-15 2021, Jaipur). 
   
• Program committee member of MathCrypt 2021 (Aug 15 2021, virtual).
   
• Program committee member of ECC 2020 (Oct 26-30 2020, virtual).
   
• Editorial board member of Journal of Mathematical Cryptology, 2006-2019.
   
• Program committee member of ECC 2019 (Dec 2-4 2019, Bochum, Germany).
   
• Program committee member of MathCrypt 2019 (Aug 18 2019, Santa Barbara).
   
• Editorial board member of IEEE Transactions on Information Theory, 2015-2018.
   
• Program committee member of MathCrypt 2018 (Aug 19 2018, Santa Barbara).
   
• Program committee member of Mycrypt 2016 (Dec 1-2 2016, Kuala Lumpur, Malaysia).
   
• Program committee member of Latincrypt 2015 (Aug 23-26 2015, Guadalajara, Mexico).
   
• Program committee member of SECITC 2015 (Jun 11-12 2015, Bucharest, Romania).
   
• Scientific committee member of ECC 2014 (Oct 8-10 2014, Chennai, India).
   
• General chair of PQCrypto 2014 (Oct 1-3 2014, Waterloo).
   
• Co-program chair (with Diego Aranha) of Latincrypt 2014 (Sep 17-19 2014, Florianopolos, Brazil).
   
• Local organizer for Algebraic Combinatorics: Spectral Graph Theory, Erdos-Ka-Rado Theorems and Quantum Information Theory (Jun 23-27 2014, Waterloo).
   
• Webmaster for The Kovalevskaia Fund.
   
• Scientific committee member of ECC 2013 (Sep 16-18 2013, Leuven, Belgium).
   
• Program committee member of SAC 2013 (Aug 14-16 2013, Burnaby, Canada).
   
• Accreditation board member of Computer & Communications Security Abstracts, 1999-2012.
   
• Scientific committee member of ECC 2012 (Oct 28-31 2012, Queretaro, Mexico).
   
• Program committee member of Asiacrypt 2011 (Dec 4-8 2011, Korea).
   
• Scientific committee member of ECC 2011 (Sep 19-21 2011, Nancy, France).
   
• Program committee member of Eurocrypt 2011 (May 15-19 2011, Estonia).
   
• Program committee member of Indocrypt 2010 (December 12-15 2010, Hyderabad).
   
• Program committee member of IWSEC 2010 (November 22-24 2010, Kobe).
   
• Program committee member of ISC 2010 (October 25-28 2010, Boca Raton).
   
• Program committee member of Latincrypt 2010 (August 8-11 2010, Puebla).
   
• Program committee member of PKC 2010 (May 26-28 2010, Paris).
   
• Program committee member of Africacrypt 2010 (May 3-6 2010, Cape Town).
   
• Program committee member of Cryptography and Coding (Dec 14-17 2009, Cirencester).
   
• Program committee member of Indocrypt 2009 (Dec 13-16 2009, New Delhi).
   
• Program committee member of IWSEC 2009 (Oct 28-30 2009, Toyama).
   
• Program committee member of ASIACCS '09 (Mar 17-19 2009, Sydney).
   
• Program committee member of Indocrypt 2008 (Dec 14-17 2008, Kharagpur).
   
• Program committee member of Pairing 2008 (Sep 1-3 2008, London).
   
• Program committee member of Eurocrypt 2008 (Apr 14-17 2008, Istanbul).
   
• Member of the Canada Research Chairs College of Reviewers, 2002-.
   
• Program committee member of Cryptography and Coding (Dec 18-20 2007, Cirencester).
   
• Program chair of Crypto 2007 (Aug 19-23 2007, Santa Barbara).
   
• Program committee member of PKC 2007 (Apr 16-20 2007, Beijing).
   
• Organizing committee member of the Thematic Program in Cryptography, The Fields Institute, Sep-Dec 2006, Toronto.
   
• Program committee member of Asiacrypt 2005 (Dec 1-4 2005, Chennai, India).
   
• Editorial board member of Designs, Codes and Cryptography, 1996-2005.
   
• Program chair of CT-RSA 2005 (Feb 14-18 2005, San Francisco).
   
• Program committee member of Indocrypt 2004 (Dec 20-22 2004, Chennai, India).
   
• Program committee member of SAC 2004 (Aug 9-10 2004, Waterloo).
   
• Program committee member of PKC 2004 (Mar 1-4 2004, Singapore).
   
• Program committee member of Indocrypt 2003 (Dec 8-10 2003, New Delhi, India).
   
• Program committee member of SAC 2003 (Aug 14-15 2003, Ottawa).
   
• Program committee member of ACISP 2003 (Jul 9-11 2003, Wollongong, Australia).
   
• Co-Program chair (with Palash Sarkar) of Indocrypt 2002 (Dec 15-18 2002, Hyderabad, India).
   
• Program committee member of Asiacrypt 2002 (Dec 1-5 2002, Queenstown, New Zealand).
   
• Program committee member of AD-HOC Networks and Wireless (ADHOC-NOW) (September 20-21 2002, Toronto).
   
• Program committee member of Crypto 2002 (Aug 18-22 2002, Santa Barbara).
   
• Program committee member of CT-RSA 2002 (Feb 18-22 2002, San Jose).
   
• Program committee member of Indocrypt 2001 (December 16-20 2001, Madras, India).
   
• Organizing committee member of Sixth International Conference on Finite Fields and Applications (Fq6) (May 21-25 2001, Oaxaca, Mexico).
   
• Program committee member of Indocrypt 2000 (December 10-13 2000, Calcutta, India).
   
• Program committee member of Asiacrypt 2000 (December 3-7 2000, Kyoto, Japan).
   
• Program committee member of Eurocrypt 2000 (May 14-18 2000, Bruges, Belgium).
   
• Member of the NSERC Applied Mathematics Grant Selection Committee (1997-2000).