Efficient Methods for Integrating Traceability and Broadcast Encryption

Key Preassigned Traceability Schemes for Broadcast Encryption (extended Abstract)

Key Preassigned Traceability Schemes for Broadcast Encryption

Traceability schemes for broadcast encryption are deened by Chor, Fiat and Naor in 6] to protect against a possible coalition of users producing an illegal decryption key. Their scheme was then generalized by Stinson and Wei in 17]. These schemes assume that every user can decrypt the secret value. In this paper we discuss key preassigned tra-cability schemes, in which only the users in a speci...

Design and formal verification of DZMBE+

In this paper, a new broadcast encryption scheme is presented based on threshold secret sharing and secure multiparty computation. This scheme is maintained to be dynamic in that a broadcaster can broadcast a message to any of the dynamic groups of users in the system and it is also fair in the sense that no cheater is able to gain an unfair advantage over other users. Another important feature...

Bounds on Traceability Schemes

The Stinson-Wei traceability scheme (known as traceability scheme) was proposed for broadcast encryption as a generalization of the Chor-Fiat-Naor traceability scheme (known as traceability code). Cover-free family was introduced by Kautz and Singleton in the context of binary superimposed code. In this paper, we find a new relationship between a traceability scheme and a cover-free family, whi...

Generic Construction of Hybrid Public Key Traitor Tracing with Full-Public-Traceability

In Eurocrypt 2005, Chabanne, Phan and Pointcheval introduced an interesting property for traitor tracing schemes called public traceability, which makes tracing a black-box public operation. However, their proposed scheme only worked for two users and an open question proposed by authors was to provide this property for multi-user systems. In this paper, we give a comprehensive solution to this...