A method for realizing identity-based broadcast encryption by ciphertext-policy attribute-based encryption

Abstract

There is provided a method for realizing identity-based broadcast encryption by ciphertext-policy attribute-based encryption. The steps of the method are as follows: in step 1, a PKG (Private Key Generator) inputs a safety coefficient of a system to output an initialization parameter; in step 2, the PKG runs a random number generation algorithm to choose a random number required for the system; in step 3, the PKG executes operation to obtain a public key and a master secret key; in step 4, an encrypting party chooses the random number and completes operation to output a part of ciphertext; in step 5, the encrypting party executes calculation according to a set of identities of decrypting users to obtain the remaining part of the ciphertext; in step 6, the PKG runs a random number generation algorithm to obtain a random parameter; in step 7, the PKG executes calculation according to the master secret key and the identity of the user to obtain a private key SKID; in step 8, a decrypting party conforming to requirement is able to execute calculation according to the private key and the ciphertext to obtain K; and in step 9, the decrypting user is able to output correct plaintext by executing calculation according to the K. According to the invention, a development cycle and system load are reduced greatly, and chosen ciphertext attack can be resisted, which ensures safety and effectiveness of the scheme.

Description

(1) Technical field: [0001] The present invention provides a method for realizing identity-based broadcast encryption by attribute-based encryption of ciphertext policy, which is referred to as a method for realizing IBBE by CP-ABE, which can be used for secure communication in data-driven networks and belongs to the field of information security. field of cryptography. (2) Technical background: [0002] In recent years, many new data-driven networks have been proposed and designed, such as social networks, wireless sensor networks, electronic health networks, etc., which provide a more flexible way for data collection. It allows data to be collected by distributed terminals for sharing by individuals or groups. For example, in the electronic health network, the data center collects and stores the patient's personal medical records so that the doctor can consult them when the patient goes to see a doctor. Some researchers, authoritative institutions, etc. may also use thes...

AI Technical Summary

Problems solved by technology

[0008] When these cryptographic systems are applied to data-driven networks (such as electronic health networks) to achieve access control of private data, a very practical problem arises: although many provably secure cryptosystems have various advantages (such as fixed-length ciphertext / public key, efficient encryption / decryption steps, etc.), but almost all systems are independently designed

This makes efficient conversion a problem

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