Off-line data encryption method and decryption method and corresponding apparatus and system

Abstract

The present invention provides an off-line data encryption method and decryption method and a corresponding apparatus and system. The encryption method comprises: randomly generating a symmetric key; performing encryption for plain-text off-line data by using the symmetric key and by using a preset first encryption algorithm, to obtain cipher-text off-line data; performing encryption for the symmetric key by using a public key at a decryption end and by using a preset second encryption algorithm, to obtain an encrypted symmetric key; invoking an interface provided by a USB Key, performing encryption for an abstract of the plain-text off-line data by using a private key at an encryption end and by using a preset third encryption algorithm, to obtain a data abstract signature; and sending the abstract of the plain-text off-line data, the cipher-text off-line data, the data abstract signature, and the encrypted symmetric key to the decryption end. According to the method provided by the present invention, encryption for plain-text off-line data, the symmetric key, and the abstract of the plain-text off-line data is implemented, thereby greatly improving security of off-line data.

Description

Technical field [0001] The present invention relates to the technical field of encryption and decryption, and more specifically, to an encryption method, decryption method, and corresponding device and system for offline data. Background technique [0002] There are data exchanged through non-real-time transmission methods such as email sending and storage media copy between the internal systems of the bank and between the banking system and the external system. These data are called offline data. [0003] In order to ensure the anti-counterfeiting and security of offline data, it is necessary to sign and encrypt offline data in the prior art. Among them, the process of turning plaintext offline data into ciphertext offline data is called an encryption process, and the process of turning ciphertext offline data into plaintext offline data is called a decryption process. [0004] Specifically, in the prior art, a symmetric key is used to encrypt and decrypt offline data. The encrypti...

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Problems solved by technology

[0006] In view of this, the present invention provides an encryption method, a decryption method, and corresponding devices and systems for offline data, so as to solve the problem that the method for encrypting and decrypting offline data using a symmetric key in the prior art may easily cause the leakage of the symmetric key, thereby Issues that reduce the security of offline data

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