A digital timestamp issuance and verification method based on pki system

Abstract

The invention discloses a digital time stamp issuance and verification method based on a PKI system. The specific steps are: obtaining a digital certificate and a time stamp service provided by a certification center; creating a message digest value of a medical record document based on a hash function; The private key data of the message is encrypted according to the encryption principle to create a digital signature and send to the timestamp authority; decrypt the digital signature with the public key data in the digital certificate, and add the timestamp information combined with the private key corresponding to the digital certificate Data encryption generates a new digital signature; the timestamp authority sends the new digital signature and its own digital certificate back to the sender. The invention fully considers the time stamp authentication requirements of the digital signature of medical record documents, and can better solve the reliability problem of the time stamp authority and the user colluding with the user to change the signature in the process of digital signature, thereby enhancing the non-repudiation of the data.

Description

technical field [0001] The invention relates to the field of digital signature information security, in particular to a method for issuing and verifying digital time stamps based on a PKI system. Background technique [0002] With the increasing popularity of the Internet concept in recent years, electronic medical records will gradually replace traditional paper medical records and realize electronic management of personal health status and medical care information on the basis of meeting all diagnosis and treatment, legal and management needs. The emerging digital signature technology continues to develop, among which, the non-repudiation of the digital signature by the physician is one of the important functions of the digital signature. When a medical dispute occurs, there must be evidence to verify the identity of the physician or medical technician involved, but identification information alone is not enough, because the responsible physician or medical technician may ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned timestamp protocol is not feasible in implementation, and it involves the confidentiality of the medical record document W, the integrity of the file during uploading and storage, the resource utilization problem caused by the file being too large, and the possible existence of The problem of the authenticity of the signature of TSA and user collusion and deception; based on the above steps, relevant scholars have made improvements and proposed a TSA credible timestamp scheme that replaces the original medical record document W with the abstract value H of the document, and uses digital signatures in the transmission process Technology, which better solves the problems of confidentiality, integrity and resource utilization, but it does not technically solve the problem of the credibility of the timestamp authority and the user colluding to change the signature that may exist in the digital signature process

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