Efficient Privacy-Preserving Ciphertext-Policy Attribute Based Encryption and Broadcast Encryption
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United States of America Patent
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Issued Date -
Aug 18, 2016
app pub date -
Mar 17, 2014
filing date -
Mar 15, 2013
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Abstract
A new construction of CP-ABE, named Privacy Preserving Constant CP-ABE (PPC-CP-ABE) that significantly reduces the ciphertext to a constant size with any given number of attributes is disclosed. PPCCP-ABE leverages a hidden policy construction such that the recipients' privacy is preserved efficiently. A Privacy Preserving Attribute Based Broadcast Encryption (PP-AB-BE) scheme is disclosed. PP-AB-BE is flexible because a broadcasted message can be encrypted by an expressive hidden access policy, either with or without explicit specifying the receivers. PP-AB-BE significantly reduces the storage and communication overhead. Also, PP-AB-BE attains minimal bound on storage overhead for each user to cover all possible subgroups in the communication system.
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