Charla: Improved Non-Interactive Dining Cryptographers (en inglés)


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Charlista: 
Jeroen van de Graaf, Universidade Federal de Minas Gerais, Brazil.
Fecha: 
14 Enero, 2014 - 12:00
Sala: 
Auditorio DCC, tercer piso.
Organización: 
Alejandro Hevia, académico DCC.

 

Abstract:

 

Dining Cryptographers is a well-known cryptographic protocol for anonymous broadcast, proposed by Chaum. In the original model it is assumed that all participants are on-line, which allows correcting problems that may occur, such as collisions (two participants happening to choose the same slot) or disrupters (dishonest participants who deviate from the protocol).

 

In 2006, the author proposed an off-line variant in which, after a preliminary phase in which random strings are exchanged, the participants only publish one long message. In this talk we will discuss this protocol and present some new results to improve efficiency.

 

This is joint research with Pablo García and Germán Montejano.

 

Speaker bio:

 

Jeroen van de Graaf is a researcher in cryptography, focusing on the theoretical and the applied aspects of cryptographic protocols. Topics of interest include: unconditionally secure protocols for ubiquitous computing (RFID, sensor, smart phones, cloud) and elections; mixing and dining-cryptographers protocols; protocols based on quantum-optical noise, and other privacy-enhancing techniques. He has a bachelor's and a MSc in mathematics from the Universiteit van Amsterdam (1981, 1985); and a PhD in Informatics from the Université de Montréal (1998). From August 2008 until January 2011 he was an Assistent Professor at the Universidade Federal de Ouro Preto. Since March 2011 he is at the Universidade Federal de Minas Gerais.