High-performance data multi-level encryption and decryption method and system based on complete homomorphic encryption

A homomorphic encryption, encryption and decryption technology, applied in the field of information security, can solve problems such as inability to dynamically adjust, inability to access ciphertext, and large ciphertext

A homomorphic encryption, encryption and decryption technology, applied in the field of information security, can solve problems such as inability to dynamically adjust, inability to access ciphertext, and large ciphertext

CN113078992AActive Publication Date: 2021-07-06上海六坊信息科技有限公司 +1
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  • High-performance data multi-level encryption and decryption method and system based on complete homomorphic encryption
  • High-performance data multi-level encryption and decryption method and system based on complete homomorphic encryption
  • High-performance data multi-level encryption and decryption method and system based on complete homomorphic encryption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] For the sake of convenience, this embodiment uses the simplest summation and disassembly scheme for description, taking three-level encryption as an example, where PK is the public key and SK is the private key. The specific operation steps are as follows:

[0065] A. The first level platform provides centralized identity registration, key generation, key distribution services, and initializes a pair of public and private keys SK pub and PK pub As a public ciphertext space (S pub ) key;

[0066] B. After the secondary account A completes the registration, the central platform generates the corresponding public-private key pair SK A and PK A , and send the PK pub and the conversion dictionary (T pub＝>A ) to A, who holds the conversion dictionary (T A＝>pub );

[0067] C. After the registration of the third-level account A1 (organization) under the second-level account is completed, the central platform generates the corresponding public-private key pair SK A1 and ...

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Abstract

The invention discloses a high-performance data multi-stage encryption and decryption method based on complete homomorphic encryption, which encrypt data by a symmetric key by means of a complete homomorphic encryption technology, encrypt the symmetric key by using a multi-stage encryption technology, establish a user relationship tree structure, and can achieve multi-level and controllable data encryption supporting a tree-shaped user system. Compared with an original multi-level encryption method directly for data encryption, the method has higher speed of encryption and decryption operation on data to be protected, smaller size of a ciphertext, and better facilitates the transmission and storage of the ciphertext. The invention also discloses a system for realizing the multi-stage encryption and decryption method.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a high-performance data multi-level encryption and decryption method and system based on complete homomorphic encryption. Background technique [0002] Multi-level encryption can enable users with tree-like affiliation to use their own private keys to share encrypted data. Specifically, users located near the root of the user relationship tree can use their own private keys to correctly decrypt the encrypted data of all directly subordinate users. , but cannot decrypt the encrypted data of its immediate superior users, nor can it decrypt the encrypted data of users located in different branches of the relationship tree with this user. However, because multi-level encryption technology is slower than many common encryption technologies, and the ciphertext volume is larger, the operation and storage overhead of using multi-level encryption to protect the entire amount of...

Claims

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Application Information

Patent Timeline
06 Jul 2021
Publication
CN113078992A
IPC
H04L9/00; H04L29/06
CPC
H04L9/008; H04L63/0435
Inventors
郑珂威; 王敏