Constructing Multiple Authorities Attribute-Based Broadcast Encryption: Proposed Approach

Vishal M. Shah, Viral V. Kapadia

Abstract


A message is to be transmitted to a single recipient known when encryption is performed in standard encryption approach like public-key encryption and identity-based encryption. Likewise, broadcast encryption shows approaches in which a sender specifies a set of receivers when encrypting a plaintext explicitly. On other hand, Attribute-Based Encryption (ABE) determines the capabilities decryption based on users attributes and access policy which is composed of one or more attributes. And also Attribute-based broadcast encryption removes the limitation of traditional Broadcast Encryption (BE) by doing encryption based on Ciphertext policy Attribute-Based Encryption (CP-ABE) by defining an attributes into the system. The new efficient ABBE reduces the size of ciphertext to a constant value. This entire encryption-decryption technique is based on single-authority attribute-based broadcast encryption approach. The single trusted party monitors all attributes and issues decryption keys. But there is an issue with this approach as if number of attributes is added into a system increases the size of the ciphertext. Due to above issue burden of single-authority (single-key generator) increases. The primary objective: Multiple Authorities Attribute-Based Broadcast Encryption scheme reduces burden of the single-key generator by having many authorities operating parallel, hence each different sets of attributes are handled by a secret keys. And also provides security against some attacks.

Keywords Secrete-key Encryption, Public-key Encryption, Identity- Based Encryption (IBE), Attribute-Based Encryption (ABE), Ciphertext policy Attribute-based Encryption (CP- ABE), Constant Ciphertext policy Attribute-Based Encryption (CCP-ABE), Attribute- Based Broadcast Encryption (ABBE).


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