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  SQL Server Tips by Gama and Naughter

Message Signing / Verification

A digital signature is the electronic equivalent of a handwritten signature. It proves to the recipient of a message, that the message could only have come from the sender of the message, and its contents have not been modified since it was signed. To achieve an electronic equivalent of this, public key cryptography can be used. What happens is that the contents of the message are encrypted using the sender’s private key. This is called “Signing” a message. The recipient of the message then decrypts using the sender’s public key. If the decryption is successful, then the message has been “Verified”. In practice, due to performance issues with Public Key Cryptography, a hash of the original document is encrypted with the public key, rather than the whole message. Then the receiver receives the message along with the signature. A hash is created against the received data and this is compared to the decrypted signature. If these two values are the same then the signature is valid.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

 

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