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(CIS 175 -Intro 2 Ntwrking) Wk10 Quiz

(CIS 175 -Intro 2 Ntwrking) Wk10 Quiz - Excellent Thanks...

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Excellent. Thanks. Wk #10 Quiz 1. Define digital signatures. A digital signature is an autograph the sender (‘Bob’) places on the data which is unique to him. The signature assures the validity of the sender and that any changes made will be detected. To sign a document, the sender will compress the data with a hash function. These few lines are the message digest. You can’t change a message digest back into the original data from which it was created. The sender will then encrypt the message digest with his private key. The receiver (‘Alice’) decrypts the signature (using the sender’s public key) changing it back into a message digest. If this worked, then it proves that Bob signed the document, because only the sender would have the private key. The receiver then sends the message again through a hash function to turn it into a message digest. If the message digest is the same as the message digest created when the signature was decrypted, then the receiver knows that the signed data has not been changed.
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