Efficient digital e-sign,
Assume you were going to
send the draft of a contract
to your lawyer in another town. You want to give your
lawyer the assurance that it
was unchanged from what
you sent and that it is really from you.
- You copy-and-paste
the contract (it's a short one!) into an e-mail note.
- Using special
software, you obtain a message hash (mathematical
summary) of the contract.
- You then use a
private key that you have previously obtained from a
public-private
key authority to encrypt the hash.
- The encrypted hash
becomes your digital signature of the message.
(Efficient
digital e-sign,
Note that it will be
different each time you send a message.)
At the other end, your
lawyer receives the message.
- To make sure it's
intact and from you, your lawyer makes a hash of the
received message.
- Your lawyer then
uses your public key to decrypt the message hash or
summary.
- If the hashes match,
the received message is valid,
efficient digital e-sign.
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