Digitally signing and verifying messages
Digital signatures are a mechanism for signing a message payload using public key, also known as asymmetric, cryptography to prove the authenticity of a message. This scheme additionally provides non-repudiation to a message exchange, meaning that a sender will not be able to deny at a future point in time that the message was sent by him/her.
To use this mechanism, a system uses a pair of cryptographic keys that are made up of a private key known only to itself, and a public key that is freely given out to third parties.
Before sending a message, the system uses the private key to generate a message signature (a type of checksum) based on the message contents, and appends it to the message.
The receiving ...
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