This document discusses digital signatures, which provide authenticity, integrity, and non-repudiation for electronic documents. A digital signature is a mathematical scheme that uses public key encryption to verify that a digital message was created by a known sender and was not altered in transit. The document outlines the basic requirements of private and public keys, and how the technology works. It compares digital and paper signatures, and lists some applications of digital signatures such as electronic mail, data storage, and software distribution.

1. Digital Signature
Prepared By: Rajan goyal
Enrollment No: CRO0700930

2. CONTENT
• Introduction
• What is Digital Signature ?
• Why Digital Signature ?
• Basic Requirements….
• How the Technology Works
• Approaches
• Paper Signatures v/s Digital Signatures
• Application
• Drawbacks
• Conclusion

3. INTRODUCTION
The authenticity of many legal, financial, and other documents is done by
the presence or absence of an authorized handwritten signature.
“Digital Signature” is the best solution for authenticity in various fields.
A digital signature is nothing but an attachment to any piece of electronic
information, which represents the content of the document and the
identity of the owner of that document uniquely.

4. What is digital signature
A digital code (generated and authenticated by public key encryption)
which is attached to an electronically transmitted document to verify its
contents and the sender's identity.
A digital signature is a mathematical
scheme for verifying the authenticity of
digital messages or documents. A valid
digital signature, where
the prerequisites are satisfied, gives a
recipient very strong reason to believe
that the message was created by a
known sender (authentication), and that
the message was not altered in transit
(integrity).

5. Why Digital Signatures ?
To provide Authenticity, Integrity and Non-repudiation to electronic documents.
To use the Internet as the safe and secure medium for e-Commerce and e-
Governance

6. BASIC REQUIREMENTS
Private Key
The private key is one which is accessible only to the signer. It is used to generate
the digital signature which is then attached to the message.
Public Key
The public key is made available to all those who receive the signed messages
from the sender. It is used for verification of the received message.

7. HOW THE TECHNOLOGY WORKS??

10. Paper Signatures v/s Digital
Signatures
PARAMETER PAPER SIGNATURE DIGITAL SIGNATURE
Authenticity May be forged Can not be copied
Integrity Signature independent
of the document
Signature depends on
the contents of the
document
Non-repudiation a. Handwriting expert
needed
b. Error prone
a. Any computer user
b. Error free

11. APPLICATIONS
Electronic Mail
Data storage
Electronic funds transfer
Software Distribution
Smart Cards
ISDN
Time Stamped Signature

12. Thanks…