Do you know what the word digital signature is used for? Will you use word digital signatures to protect documents? Today the editor will talk about word digital signatures.

1. What is a "digital signature"

We all know about signatures in real life. A signature represents a person's exclusive "copyright" signature. Haha, of course the so-called "digital signature" It uses a certain cryptographic operation to generate a series of symbols and codes to form an electronic password for signature. It is a virtual electronic form of technical verification. The accuracy of its verification is incomparable to the verification of ordinary manual signatures and seals. "Digital signature" is currently the most commonly used, technically mature, and most operable electronic signature method in e-commerce and e-government. It adopts standardized procedures and scientific methods to identify the identity of the signer and recognize the content of an electronic data. It can also verify whether the original text of the file has been changed during the transmission process, ensuring the integrity, authenticity and non-repudiation of the transmitted electronic file.

Digital signature is defined in the ISO7498-2 standard as: "Some data appended to the data unit, or a cryptographic transformation made to the data unit. This data and transformation allows the recipient of the data unit to use To confirm the source of the data unit and the integrity of the data unit, and to protect the data from forgery by others (such as the recipient)." The U.S. Electronic Signature Standard (DSS, FIPS186-2) explains digital signatures as follows: "The result of calculating data using a set of rules and a parameter, which can be used to confirm the identity of the signer and the integrity of the data." According to the above definition, PKI (Public Key Infrastructino) provides cryptographic transformation of data units, and enables the recipient to determine the source of the data and verify the data.

2. What is the use of word digital signature

The reasons for digitally signing documents are roughly the same as signing paper documents. Digital signatures are verified through the use of computer encryption (Authentication: The process of verifying that people and products are who they say they are. For example, confirming the source and integrity of a software publisher's code by verifying the digital signature used to sign the code.) Digital information, such as documents, emails, and macros.

Word digital signatures help ensure the following:

Authenticity – Word digital signatures help ensure that the signer’s identity is who they claim to be.

Integrity--Word digital signatures help ensure that content has not been altered or tampered with after it has been digitally signed.

Non-repudiation - word digital signatures help prove to all parties the validity of the signed content. "Repudiation" means that the signer denies any behavior related to the signed content.

In order to ensure the above, the content must be digitally signed by the content creator using a signature that meets the following conditions: The word digital signature is valid (valid: a certificate status, according to the certificate authority's database The certificate is checked and found to be legal, up-to-date, and not expired or revoked. Documents signed by a valid certificate and not changed after signing are considered valid documents.

3. How to use word numbers. Signature protection document

Here are the specific steps to use word digital signature to protect documents:

1. Select the "Insert" tab and click "Microsoft Office Signature Line" command in the "Signature Line" drop-down list.

2. Open the "Signature Settings" dialog box and enter the name of the signer in the "Suggested Signer" text. Enter the signer's title in the "Suggested signer title" text box, check the "Show signing date in signature line" checkbox, and then click the "OK" button

3. In the document. Double-click the inserted signature line in to open the "Signature" dialog box and perform the following operations:

I) To add a printed version of your signature, enter your name in the text box to the right of the "X".

II) To select an image for your handwritten signature, click the "Select Image" button, in the "Select Signature Image" dialog box, find the location of the signature image file, select the desired file, and click Click the "Select" button.

4. After completing the above operations, click the "Signature" button. The "Signature Confirmation" dialog box will pop up. Click the "OK" button.

The above is the relevant content about word digital signature, I hope it will be helpful to you.