Attribute based broadcast encryption with short ciphertext and decryption key

• Main Authors: PHUONG, Tran Viet Xuan, YANG, Guomin, SUSILO, Willy, CHEN, Xiaofeng
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2015
• Subjects: ANDgate; Attribute based encryption; Broadcast encryption; Wildcard; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/7373; https://ink.library.smu.edu.sg/context/sis_research/article/8376/viewcontent/Attribute_based_broadcast_encryption_with_short_ciphertext_and_decryption_key.pdf
• Institution: Singapore Management University

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.