Skipping, Cascade, and Combined Chain Schemes for Broadcast Encryption

One-Way Chain Based Broadcast Encryption Schemes

We propose a new broadcast encryption scheme based on the idea of ‘one key per each punctured interval’. Let r be the number of revoked users. In our scheme with p-punctured c-intervals, the transmission overhead is roughly r p+1 as r grows. Our scheme is very flexible with two parameters p and c. We may take p as large as possible if a user device allows a large key storage, and set c as small...

Generic Transformation for Scalable Broadcast Encryption Schemes

Broadcast encryption schemes allow a message sender to broadcast an encrypted data so that only legitimate receivers decrypt it. Because of the intrinsic nature of one-to-many communication in broadcasting, transmission length may be of major concern. Several broadcast encryption schemes with good transmission overhead have been proposed. But, these broadcast encryption schemes are not practica...

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...

Generalized Identity Based and Broadcast Encryption Schemes

We provide a general framework for constructing identitybased and broadcast encryption systems. In particular, we construct a general encryption system called spatial encryption from which many systems with a variety of properties follow. The ciphertext size in all these systems is independent of the number of users involved and is just three group elements. Private key size grows with the comp...

Key Preassigned Traceability Schemes for Broadcast Encryption (extended Abstract)