A digital signature may be a mathematical style for the verification functions of authentic digital messages or documents. A digital signature will act as how to send messages through the insecure channels while not compromising issues of problems with the message or document that has been sent. The Information Technology Act, 2000 includes provisions for the utilization of Digital Signatures on documents that are submitted in electronic form with the target of maintaining the security and credibility of the documents filed on-line.

Digital signature for various documents

Digital signature for pdf documents

There is a protocol you have to follow to sign a pdf. This is described below-

• Firstly, open your PDF document
• Then right click on the PDF document where you want to add the digital signature
• Select the “SIGN DOCUMENT” from the right click menu
• Now, select the digital signature
• Use the “RADIO BUTTONS” and DROPDOWN MENUS to add the signature file
• Click on the “AFFIX SIGNTURE” to add that signature in the document

Digital signature for word

There are some specific documents and processes for adding digital signature for word document.

• To add a digital signature, open your Microsoft Word document and click where you’d like to add your signature line.
• From the Word ribbon, select the Insert tab and then click Signature Line in the Text group.
• A Signature Setup pop-up box appears. Press enter after your information in the text fields and then click OK.
• Double-click the signature line.
• A Sign pop-up box appears. At the X, type your name. Next, look at the Signing as: field. Select the signing certificate. For ensuring the fact “this is the correct certificate”, click on the Change button.
• Click on Click here to view certificate properties.
• The Certificate Details box appears. Open the Details tab and scroll down to the Key Usage. Single-click on it. The lower text box will display Digital Signature and Non-Repudiation. If it does so, then this is the right certificate. Click OK.
• If this is the wrong certificate, click OK. Then click More Choices to see other certificates. Now select another certificate. Repeat these steps until you find the correct certificates.
• Click the Sign button to sign the document. Then Insert your PIV card into the card reader. Now enter your Smart Card or PIV PIN and click on the OK.
• The Signature Confirmation box tells you that Word saved your digital signature. Click OK.

Digital signature for excel

• Click the Microsoft Office Button, point to Prepare, and then click Add a Digital Signature.
• Click OK.
• If the workbook has changed and is not yet saved, or if it is not saved in the Excel 2007 workbook format, you receive the following message:
• Before you can add signatures, you must save the workbook in a format that supports digital signatures.
• Do you want to save the workbook as a Microsoft Office Excel Workbook?
• Click Yes to display the Save As dialog box. You will save the file in the Excel Workbook and the format will be like (*.xlsx) format to add the digital signature.
• After you save the workbook, the Get a Digital ID dialog box is displayed. After that select the type of digital ID which you want to use. Then click on OK.
• After you complete the necessary steps for the type of digital ID that you selected, your Excel workbook is now signed.

Excel 2003

• On the Tools menu, click Options.
• On the Security tab, click Digital Signatures.
• Click Add.
• If the workbook has changed and is not yet saved, or if it is not saved in the Excel 2003 workbook format, you receive the following message: This workbook must be saved as a Microsoft Excel workbook before it can be digitally signed.
• Do you want to save the workbook? Click Yes to display the Save As dialog box. You have to save the file in the Microsoft Excel Workbook format for adding intended the digital signature.
• After you save the workbook, the Select Certificate dialog box is basically displayed. Then select the certificate that you want to use, and then click OK.
• Click OK to close the Digital Signatures dialog box.

Your Excel workbook is now signed.To verify the changes have not occurred in the signed workbook. For this process  follow these steps:

• On the Tools menu, click Options.
• On the Security tab, click Digital Signatures.
• On the Signatures tab, if a signer is listed in the The following have digitally signed this document list, you can be assured that the file has not been changed or tampered since the digital signature was created and added to the file.

Digital signature windows drivers

Windows always uses a valid digital signature for the verification process as the following:

• The file, or the collection of files, is signed.
• The signer is trusted.
• The certification authority that authenticated the signer is trusted.
• The collection of files was not altered after it was published.

Digital signature for google docs

The following steps are required to follow for putting digital signature on the google docs 

• Go to Docs menu bar
• Click on Insert
• Drawing > + New
• Click on  
• Then choose Scribble
• Write your signature just how you normally would have done
• Adjust the size, colour, line weight and more that is necessary
• Once you’re clear on head  choose Save and close
• Move the newly created signature to the right location