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Digital Signatures

CA Anand Sarda (Working) (1580 Points)

08 July 2008

Hello Friends,

Lets us discuss about Digital Signatures!!!

What is Digital Signatures?

Who can issue them?

what is public key & private key?

How does Digital signature works?

Those who know this pls contribute your knowledge?

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4 Replies

Sujit Talukder (service) (719 Points)
Replied 08 July 2008

You may refer Information Technology Act, 2000

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CA Anand Sarda (Working) (1580 Points)
Replied 08 July 2008

I read IT Act 2000

Iam asking here bcoz i didnot understood from the book.

If u can explain something about it, it will be of great help.

CA Anand Sarda (Working) (1580 Points)
Replied 10 July 2008

Share your knowledge friends.....

SANJOO (WORK) (26 Points)
Replied 28 July 2008

Digital Signature means authentication of any electronic record by a subscriber by means of an electronic method. It uses asymmetric crypto system (ACS) for this purpose, which consists of -

· Private key for a message creation and

· Public key for verification of the Digital Signature.

The Digital Signature functions in two distinct steps.

First, the electronic record is created into a message digest by using a mathematical function known as “hash function”, which digitally freeze the electronic record thus ensuring the integrity of the contents of intended communication contained in the electronic record. Any tempering with the content – intentionally or otherwise on the electronic record will immediately invalidate the Digital Signature. In the second step, the identity of the person affixing the Digital Signature is authenticated through the use of private key, which is attached to the message digest and which can be verified by any person, who has public key corresponding such private key. This will enable any person to verify whether the electronic record is retained intact or has been tampered with. It will also enable a person who has a public key to identify the originator of the electronic message.