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07-04-2009, 08:54 PM
Post: #1
Digital Signature Full Seminar Report Download
Digital Signature

Abstract :

The authenticity of many legal, financial, and other documents is determined by the presence or absence of an authorized handwritten signature. The recipient of the signed document can verify the claimed identity of the sender using the signature. Also, if the sender later repudiates the contents of the document, then recipient can use the signature to prove the validity of the document.

With the computerized message systems replacing the physical transport of paper and ink documents, an effective solution for authentication of the electronic data is necessary. Various methods have been devised to solve this problem, but the use of Ëœdigital signatureâ„¢ is definitely the best solution amongst them.

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 originator of that document uniquely. The digital signature is intended for use in electronic mail, electronic funds transfer, electronic data interchange, software distribution, data storage, and other applications which require data integrity assurance and data origin authentication.

When a message is received, the recipient may desire to verify that the message has not been altered in transit. Furthermore, the recipient may wish to be certain of the originator's identity. Both of these services can be provided by the digital signature. A digital signature is an electronic analogue of a written signature in that the digital signature can be used in proving to the recipient or a third party that the message was, in fact, signed by the originator. Digital signatures may also be generated for stored data and programs so that the integrity of the data and programs may be verified at any later time.

Although there are various approaches to implement the digital signature, this report discusses the ËœDigital Signature Standardâ„¢. It specifies the Digital Signature Algorithm (DSA) which is appropriate for applications requiring a digital rather than written signature. The DSA is considered as the standard procedure to generate and verify digital signatures. A DSA digital signature is a pair of large numbers represented in a computer as strings of binary digits.

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04-03-2011, 12:58 AM
Post: #2
RE: Digital Signature Full Seminar Report Download
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04-03-2011, 01:05 AM
Post: #3
RE: Digital Signature Full Seminar Report Download
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04-03-2011, 01:23 AM
Post: #4
RE: Digital Signature Full Seminar Report Download
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29-03-2011, 02:21 PM
Post: #5
RE: Digital Signature Full Seminar Report Download
Presented by :
SNIGDHA ADHIKARY


.ppt  30742303-Digital-Signature-PPT.ppt (Size: 599 KB / Downloads: 280)
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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