Efficient online and offline encryption method based on SM9 public key encryption algorithm

Abstract

The invention provides an efficient online and offline encryption method based on an SM9 public key encryption algorithm, which optimizes a ciphertext generation algorithm in a data encryption processon the basis of not changing the overall architecture of the SM9 public key encryption algorithm, and decomposes the ciphertext generation algorithm into two sub-algorithms: an offline encryption algorithm and an online encryption algorithm. Under the condition that encrypted data and a receiver identifier do not need to be known, a sender can calculate part of encryption operation in advance through the offline encryption algorithm, completes most of high-overhead operation, and generates an offline ciphertext. After the encrypted data and the receiver identifier are known, the sender quickly encrypts the data by using an offline ciphertext through the online encryption algorithm to generate an SM9 public key encrypted ciphertext. The process only requires a small amount of lightweight computation, and has low requirements for computing resources. According to the method, the security of data transmission can be ensured, the requirement for computing resources of a sender is low, themethod is particularly suitable for an application environment with limited computing resources, and the application of an SM9 public key encryption algorithm in practice is effectively promoted.

Description

technical field [0001] This application relates to the technical field of information security, and in particular to an efficient online and offline encryption method based on the SM9 public key encryption algorithm. Background technique [0002] Data encryption is an effective method to protect data confidentiality. The plaintext data is hidden through technical means, so that the stored or transmitted data is a garbled code whose effective content cannot be identified, also known as ciphertext. Even if the attacker obtains the ciphertext, it cannot be decrypted correctly, and only authorized users can recover the plaintext content by using the decryption key. Encryption ensures that data content will not be leaked during network transmission and protects the confidentiality of transmitted data. Data encryption is a very important part of public key cryptography, which is widely used in military, commercial and other fields to protect the confidentiality of data. [0003]...

AI Technical Summary

Problems solved by technology

[0005] This application provides an efficient online and offline encryption method based on the SM9 public key encryption algorithm to solve the problem of high requirements for the sender's computing resources in the SM9 public key encryption algorithm

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