Attribute based broadcast encryption with short ciphertext and decryption key

Authors

Phuong Viet Xuan Tran, University of WollongongFollow
Guomin Yang, University of WollongongFollow
Willy Susilo, University of WollongongFollow
Xiaofeng Chen, Xidian UniversityFollow

RIS ID

103256

Publication Details

Tran, P. Viet Xuan., Yang, G., Susilo, W. & Chen, X. (2015). Attribute based broadcast encryption with short ciphertext and decryption key. Lecture Notes in Computer Science, 9327 252-269. Vienna, Austria 20th European Symposium on Research in Computer Security

Abstract

Attribute Based Broadcast Encryption (ABBE) is a combination of Attribute Based Encryption (ABE) and Broadcast Encryption (BE). It allows a broadcaster (or encrypter) to broadcast an encrypted message that can only be decrypted by the receivers who are within a predefined user set and satisfy the access policy specified by the broadcaster. Compared with normal ABE, ABBE allows direct revocation, which is important in many real-time broadcasting applications such as Pay TV. In this paper, we propose two novel ABBE schemes that have distinguishing features: the first scheme is key-policy based and has short ciphertext and constant size decryption key; and the second one is ciphertext-policy based and has constant size ciphertext and short decryption key. Both of our schemes allow access policies to be expressed using AND-gate with positive, negative, and wildcard symbols, and are proven secure under the Decision n-BDHE assumption without random oracles.