Tor E. Bjørstad

Personal information

I am a 25 year old Norwegian. I graduated as an MSc (Sivilingeniør) in Industrial Mathematics from the Norwegian University of Science and Technology in 2005. I am currently employed as a research fellow (universitetsstipendiat) at the Selmer Centre for reliable communication. The centre is part of the Department of Informatics at the University of Bergen, Norway.

Contact information

Work: Department of Informatics, Room 5147. Email: tor dot bjorstad at ii dot uib dot no.
Phone: (+47) 555 841 81 (office), (+47) 970 877 22 (mobile).

Research information

My research interests concern various forms of cryptology and secure communications.

• Building Better Signcryption Schemes with Tag-KEMs (Full version).
  Co-authored with Dr. Alex Dent.
  Published in the proceedings of PKC 2006 (LNCS 3958), pp. 491-507
  The paper proposes a new generic model for hybrid signcryption based on Tag-KEMs, building on previous work on such models by Dent. The new model gives rise to cleaner and simpler descriptions of insider secure signcryption schemes compared with previous models. We also propose a new signcryption scheme based on Chevallier-Mames signatures, with tight security reductions for confidentiality and authenticity.
• Provable Security of Signcryption.
  My MSc Thesis, from the Norwegian University of Science and Technology. The Thesis focuses on the provable security of Zheng's signcryption scheme under various security models. There have been found some misprints and minor errors, and I intend to put up a brief errata page at some point. In any case it is more or less superceeded by the Signcryption Tag-KEM paper.