Digital signing system and method

Abstract

The invention provides a digital signing method which comprises the following steps: acquiring the secret key information of a user; carrying out signing operation on plaintext information so as to generate a digital signature; changing the digital signature by using a watermark algorithm so as to form watermark information with the digital signature; acquiring a bitmap; processing the watermark information and the bitmap and carrying out signing on the bitmap so as to generate a bitmap signature; sending the digital signing information and the public key information of the user; showing the icon of the digital signature; acquiring the digital signing information and the public key information of the user; and verifying the bitmap signature and the digital signature; reporting the verification results of the bitmap signature and the digital signature; and verifying the effectiveness of the digital signature. The invention also provides a digital signing system. In the invention, through respectively carrying out signing on the plaintext information and the bitmap, the safety of a document is ensured; and through respectively verifying the bitmap signature and the digital signature, the authenticity of the document is ensured, and a tamper-proof effect is achieved.

Description

technical field [0001] The invention relates to the field of information security, in particular to a digital signature method and system. Background technique [0002] There are various security problems in paper documents or electronic documents in the prior art, such as being easy to be tampered with, and the signatures of paper documents are easy to be stolen. Since the content of electronic documents is easily changed, and deliberate or unintentional sabotage by others, There are various security risks in paper documents or electronic documents. In the existing document technology, paper documents that are easy to be tampered with have been made into electronic documents, and electronic signature technology is widely used for protection, which greatly increases the security of paper documents and electronic documents. [0003] Electronic signatures generally refer to all electronic documents that exist in electronic form, are attached to electronic documents and are lo...

AI Technical Summary

Problems solved by technology

Although it can also verify whether the text information has been tampered with, it cannot verify whether the bitmap has been changed, which brings unnecessary trouble and loss to real users, and the security is not high

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