Privacy Preserving Ciphertext Policy Attribute Based Encryption

• Published in: Recent Trends in Network Security and Applications pp. 402 - 409
• Main Authors: Balu, A., Kuppusamy, K.
• Format: Book Chapter
• Language: English
• Published: Berlin, Heidelberg Springer Berlin Heidelberg 2010
• Series: Communications in Computer and Information Science
• Subjects: Access policy; Attribute based encryption
• ISBN: 9783642144776; 3642144772
• ISSN: 1865-0929; 1865-0937
• DOI: 10.1007/978-3-642-14478-3_40

Ciphertext policy attribute based encryption (CP-ABE) allows to encrypt data under an access policy. The access policy can be formed with the logical combination of attributes.. Such ciphertexts can be decrypted by anyone with a set of attributes that satisfy the access policy. In CP-ABE, access policy is sent along with the ciphertext. We propose a method in which the access policy need not be sent along with the ciphertext, by which we are able to preserve the privacy of the encryptor. The proposed construction is provably secure under Decision Bilinear Diffe-Hellman assumption.