Digital Signatures
• A quick explanation of a digital signature is an encrypted hash.
• With that said, we can review our situation so far:
- To ensure that only certain people can read our data, we can encrypt the data.
-- Otherwise --
1) To ensure that plaintext data hasn’t been tampered with, we generate a message digest.
2) To ensure that the message hasn’t been replaced, we will encrypt the message digest (which is a digital
signature).
• A digital signature gives us two things:
1) Validation that the data has not been tampered with.
2) Proof that the data received is in fact from the expected sender.
• When a message digest is encrypted using a sender’s private key (this prevents tampering), the receiver
can decrypt the digest using the sender’s public key (this is proof of the sender’s identity).
• The following is a diagram of how a digital signature is used:
• A quick explanation of a digital signature is an encrypted hash.
• With that said, we can review our situation so far:
- To ensure that only certain people can read our data, we can encrypt the data.
-- Otherwise --
1) To ensure that plaintext data hasn’t been tampered with, we generate a message digest.
2) To ensure that the message hasn’t been replaced, we will encrypt the message digest (which is a digital
signature).
• A digital signature gives us two things:
1) Validation that the data has not been tampered with.
2) Proof that the data received is in fact from the expected sender.
• When a message digest is encrypted using a sender’s private key (this prevents tampering), the receiver
can decrypt the digest using the sender’s public key (this is proof of the sender’s identity).
• The following is a diagram of how a digital signature is used:
Digital Signatures
Table of Contents
Copyright (c) 2008. Intertech, Inc. All Rights Reserved. This information is to be used exclusively as an
online learning aid. Any attempts to copy, reproduce, or use for training is strictly prohibited.
online learning aid. Any attempts to copy, reproduce, or use for training is strictly prohibited.
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