Abstract
Attribute-Based Encryption (ABE) is a public key encryption scheme that allows users to encrypt and decrypt messages based on user attributes. In this paper, we consider the problem of constructing a ciphertext-policy attribute-based encryption (CP-ABE) scheme in a setting where the attributes distributor is also the owner of messages that are to be encrypted and shared. The CP-ABE scheme we propose bases on the Sibling Intractable Function Family (SIFF) scheme. Compared to the existing ABE schemes, the decryption of our scheme in this setting is quite fast and the ciphertext size is rather small. Our ABE system also provides a high degree of compatibility with the messages that are already encrypted when our system is set up, namely, encrypted messages can be used directly in our scheme without being re-encrypted. We compare the efficiency of our scheme with Bethencourt's work in this paper.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
