With the rapid development of information technology, the use of electronic documents has become an important part of social life. However, electronic documents also have the problem of technical appraisal. The technical appraisal of electronic documents refers to the appraisal of the authenticity, integrity, credibility and reliability of electronic documents through various technical means to ensure the legitimacy of electronic documents. The technical appraisal of electronic documents includes the following aspects.

I. Technical Appraisal of Digital Signature of Electronic Documents

Digital signature technology is an important technical means to ensure the authenticity and integrity of electronic documents. Digital signatures can be encrypted and decrypted to ensure that electronic files are not tampered with during transmission. The technical appraisal of digital signature of electronic documents mainly includes: legality check of digital certificate, authenticity check of digital signature, time stamp check of digital signature, etc.

Second, the metadata technical appraisal of electronic documents

Metadata refers to data describing electronic file information, including creation date, modification date, author, file format, file size and other information. Metadata technical appraisal can judge the authenticity and integrity of electronic files by checking the metadata information of electronic files. Metadata technical appraisal mainly includes: metadata extraction, metadata comparison, metadata analysis, metadata appraisal and so on.

Three, the hash value of electronic documents technical appraisal

Hash value refers to a series of digital sequences obtained by calculating electronic files through hash algorithm, and hash value can be used to detect whether electronic files have been tampered with. The technical appraisal of electronic file hash value mainly includes the calculation, comparison, analysis and appraisal of hash value.

Four. Judicial technical appraisal of electronic documents

Judicial technical appraisal of electronic documents refers to technical appraisal through the process of obtaining, saving and analyzing electronic documents to ensure the legitimacy and credibility of electronic documents. Forensic technical appraisal of electronic documents mainly includes: legal review of evidence collection, process record of evidence collection, data analysis of evidence collection, etc.

To sum up, the technical appraisal of electronic documents is an important link to ensure the legitimacy and credibility of electronic documents. Technical appraisal includes digital signature technical appraisal, metadata technical appraisal, hash value technical appraisal and judicial technical appraisal Through technical appraisal, it can effectively prevent tampering and forgery of electronic documents and ensure the authenticity and integrity of electronic documents.