Procedure for getting digital signature certificate

Tata is providing digital signature.Send application form, ID proof, address proof, photo, etc. Valid upto 1 to 2 years.

Adweb Techno Trade Pvt Ltd - partner of TCS

You can get digital signature from ICAI and private vendors like TATA Certifying Authority etc..

There are categories of DSC and You have to fill the application form, pay the fee either online or through DD, submitting the required proofs.

Browse the below link for TATA certification DSC:

https://www.tcs-ca.tcs.co.in/index.jsp?rightHtml=html/overviewDigitalCertificate.html&right1stTitle=Digital%20Certificate

If you want to get it from ICAI go to this link:

https://www.icai.org/post.html?post_id=1847&c_id=227

Your system should have JAVA Run time environment 6 to use DSC for uploading.....

there are three types of signature certificate class 1 class 2 class 3. which class certificate to be applied in case of a tax audit

You have to ask  DSC vendor for a suitable DSC for IT return uploading. The vendors normally provide descripttion of DSC that they offer along with expiry date, you have to select the appropriate one.