/Visual Studio 2008/CSXmlDigitalSignature/ReadMe.txt

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    WINDOWS APPLICATION : CSXmlDigitalSignature Project Overview

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Use:



Digital Signatures:



We take the original message and create a message digest by applying the hash

algorithm on the message. The message digest is then encrypted using the 

private key known only to the private key owner (i.e., the sender).The signed

message is formed by concatenating the original message with the unique 

digital signature and the public key that is associated with the private key 

that produced that signature. This entire signed message is then sent to the 

desired recipient.



The received signed message is broken into its three components: the original

message, the public key, and the digital signature. For comparison against 

the hash of the original message, it is necessary to compute the hash of the 

received message. If the message digest has not changed, then you can be very

confident that the message itself has not changed. On the other hand, if the

message digest has changed, then you can be quite certain that the received 

message has been corrupted or tampered with.



CSDigitalSignature demonstrates how to use .NET built-in classes to implement 

Digital Signature for Xml documents.





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Code Logic:



Use .NET built-in classes to implement XML digital signature.



A. Creates a cryptographic provider object which supplies public/private

   key pair.

B. Uses the private key to sign an entire XML document.

C. Attaches the signature to the document in <Signature> element.

D. Uses the public key to verify the digital signature





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References:



.NET Security and Cryptography 

http://www.amazon.com/Security-Cryptography-Integrated-Object-Innovations/dp/013100851X



RSACryptoServiceProvider Class

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx



Cryptography in .NET

http://www.developer.com/net/net/article.php/1548761



DSACryptoServiceProvider Class

http://msdn.microsoft.com/en-us/library/system.security.cryptography.dsacryptoserviceprovider.aspx



Cryptography in Microsoft.NET Part I: Encryption

http://www.c-sharpcorner.com/UploadFile/gsparamasivam/CryptEncryption11282005061028AM/CryptEncryption.aspx



Cryptography in Microsoft.NET Part II: Digital Envelop and Digital Signatures

http://www.c-sharpcorner.com/UploadFile/Gowri%20S%20Paramasivam/Cryptography211242005003308AM/Cryptography2.aspx





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