Key Preassigned Traceability Schemes for Broadcast Encryption

Key Preassigned Traceability Schemes for Broadcast Encryption (extended Abstract)

Tracing Insider Attacks in the Context of Predicate Encryption Schemes

In a predicate encryption scheme an authority generates master public and secret keys, and uses the master secret key to derive personal secret keys for authorized users. Each user’s personal secret key SKf corresponds to a predicate f defining the access rights of that user, and each ciphertext is associated (by the sender) with an attribute. The security provided is that a ciphertext associat...

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...

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...

Optimum Traitor Tracing and Asymmetric Schemes

A traceability scheme is a broadcast encryption scheme such that a data supplier T can trace malicious authorized users (traitors) who gave a decryption key to an unauthorized user (pirate). This paper rst derives lower bounds on the sizes of keys and ciphertexts. These bounds are all tight because an optimum one-time use scheme is also presented. We then propose a multiple-use scheme which app...