Certificateless public key cryptography

Author(s)

Denise Hideko Goya

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Matemática e Estatística (IME/SBI)
• Defense date: 2011-12-16

Examining board members

Routo Terada; Paulo Sergio Licciardi Messeder Barreto; Jeroen Antonius Maria van de Graaf; Julio Cesar Lopez Hernandez; Carlos Alberto Maziero

• Advisor: Routo Terada

Abstract

Certificateless public key cryptography is an alternative model to traditional asymmetric key cryptography, because the public key authentication occurs implicitly during a protocol run, with no need of digital certificates management and distribution. It has the potential to reduce computing costs, and it allows a higher security level than the one in the identity-based model. In this PhD thesis, formal security models for certificateless authenticated key agreement are improved with two independent objectives: (1) to increase the trust level for the partial secret key generating authority on which users rely, and (2) to enable computationally efficient protocols, with significant security properties, such as resistance against attacks from adversaries with full control of the communication channel, and from adversaries who are able to replace users\' public keys by any chosen value. In order to demonstrate that these improvements made are feasible and achieve the objectives, new protocols are proposed in the two-party case. These protocols are proved secure by using reduction techniques for provable security. (AU)

• FAPESP's process: 08/06189-0 - Certificateless public key cryptography
• Grantee: Denise Hideko Goya
• Support Opportunities: Scholarships in Brazil - Doctorate