Abstract
The invention is a method for broadcast encryption that allows a broadcaster to send encrypted data to a set of users such that only a subset of authorized users can decrypt said data. The method comprises modifications to the four stages of the basic Cipher-text Policy Attribute- Based Encryption techniques. The method can be adapted to transform any Attribute-Based Encryption scheme that supports only temporary revocation into a scheme that supports the permanent revocation of users.
| Original language | English |
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| Patent number | WO2013027206 |
| IPC | H04N 21/ 00 A I |
| Priority date | 24/08/11 |
| State | Published - 28 Feb 2013 |