Digital Signature Full Seminar Report Download

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Presented by :
SNIGDHA ADHIKARY

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Why do we need Digital Signature ???
 A MAC can provide message integrity and message authentication.
 MAC has a drawback. It needs a symmetric key that must be establish between the sender and the receiver.
 A digital signature on the other hand, can use a pair of asymmetric key (one public and a private key).
What is Digital signature ???
 A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or document.
 A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and was not altered in transit.
 Digital signatures are commonly used for software distribution, financial transactions, and in cases where it is important to detect forgery and tampering .
Various methods of employing Digital Signature:-
 Using asymmetric –key Cipher.
 Using Keyed Hash function.
Public key Cryptography
• Public-key cryptography involves the use of asymmetric key algorithms.
• Asymmetric key algorithms used to create a mathematically related key pair.
• A secret Private key and a published Public key.
• Protects the confidentiality and integrity of a message.
• The message is Encrypted using the Public key, which can only be Decrypted using the Private key.
Digital Signature using Keyed Hash Function:
The electronics/equivalent of the document and finger print pair is the message and digest pair. To preserve the integrity of a message. The message is passed through an algorithm, called hash function.
The hashed function creates a compressed image of the message that can be used as a fingerprint.
 For compatibility.
 For integrity.
 For efficiency.
Cryptographic protocol
 Cryptographic protocol or Encryption protocol is an abstract or concrete protocol performing a security-related function and applies cryptographic methods. A cryptographic protocol usually incorporates at least some of these aspects:
 Key agreement or establishment.
 Entity authentication.
 Symmetric encryption and message authentication material construction.
 Secured application-level data transport.
 Non-repudiation methods.
Uses of digital signatures
1. Authentication.
2. Integrity .
Additional security precautions:-
1. Putting the private key on a smart card.
2. Using smart card readers with a separate keyboard.
3. Other smart card designs.
4. Using digital signatures only with trusted applications.
FUTURE SCENARIO
 Digital encryption of data is useful during storage and retrieval of medical history of patients involved in e-Health programs.
 The growth of e-commerce and the recent enactment of the Electronic Signatures in Global and National Commerce Act (E-Sign Act) has opened a new frontier.
 With this constant development key management is becoming an issue.
 Advancements in HotJava and JavaPlugin based technologies will maintain fluidity and flexibility in key management.

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