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Afonso Arriaga defends master dissertation entitled "Efficiency and Security Gains via Randomness Reuse Across Different Cryptographic Primitives"

Afonso Delerue Arriaga has requested the defence of his dissertation, entitled "Efficiency and Security Gains via Randomness Reuse Across Different Cryptographic Primitives". The defence will be held in room A2 of the Departamento de Informática, on July 26, 2011, 2:30pm. The public is invited.

The examining committee is the following:

  • João M. Fernandes (UMinho) - president
  • Luís Antunes (U Porto) - opponent
  • Manuel Bernardo Barbosa (UMinho) - supervisor

Abstract

The use of random coins in the implementation of cryptographic algorithms is needed in order to achieve higher security levels. This can however be costly in terms of bandwidth and computation. Minimizing the amount of fresh randomness required is important for an overall efficiency but could also lead to security flaws. Therefore, randomness reuse is an optimization that must be carefully studied on a theoretical level in order to attain the necessary security. In this dissertation we look at how randomness reuse can be applied across different cryptographic primitives. We focus our attention on joint signature and encryption, as well as on the KEM-DEM paradigm, where randomness reuse can, in specific circumstances, provide not only efficiency gains, but also additional security guarantees.

13.07.2011

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