Abstract
Ciphertext-policy attribute-based encryption (CP-ABE) is a kind of asymmetric encryption which is widely used in cyber-physical system and Internet of Things. In CP-ABE, access structure is an important component affecting the efficiency and performance greatly in several stages, such as encryption stage, key generation stage, decryption stage. However, the existing CP-ABE schemes have low efficiency because of the application of traditional access structures. In order to alleviate the aforementioned problems, this paper proposes a brand-new access structure based on multi-valued decision diagram (MDD). According to this access structure, we design a new CP-ABE scheme which performs better than many current schemes. First, our scheme supports multi-valued attributes directly. Second, the size of secret key is constant because it bears no relationship to the number of attributes. Third, the time complexity of decryption stage is O(1).
Highlights
With the development of Internet and cloud computing technology, the datas in distributed and open computing environment are more and more frequently shared and processed by people
The access structure based on multi-valued decision diagram (MDD) conforms with the realistic world more than the existing access structure such as [8] and [9], because it can represent the cases of multiple attribute values directly
We provide a new Ciphertext-policy attribute-based encryption (CP-attribute-based encryption (ABE)) scheme based on MDD, which improves the efficiency and capability in many stages
Summary
With the development of Internet and cloud computing technology, the datas in distributed and open computing environment are more and more frequently shared and processed by people. The traditional public key encryption mechanism is based on encryption technology of public key infrastructure It has enhanced the security of data, many defects still exist. ABE supported changing access structures based on attribute set, which made this scheme more realistic. The flexibility, practicability, efficiency of encryption strategy and fine-grained access policy make ABE obtain a wally application prospects in distributed file management, third party data management, group key management, privacy protection and other fields [2]. This paper puts forward a high-efficiency scheme of CP-ABE, by improving the access structure adoptting MDD. Based on MDD, this paper proposes an efficient and flexible access structure, which supports positive attributes and negative attributes, and attributes with multiple values directly. The scheme of CP-ABE this paper propose, provides a better efficiency in many stages, such as encryption stage, key generation stage and decryption stage
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