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A digital signature is a mathematical technique used to validate the authenticity and integrity of a digital document, message or software. It's the digital equivalent of a handwritten signature or stamped seal, but it offers far more inherent security.

When a signer digitally signs a document, a cryptographic hash is generated for the document. That cryptographic hash is then encrypted using the sender's private key, which is stored in a secure HSM box. It is then appended to the document and sent to the recipients along with the sender's public key.

The most common example is a wet signature scanned by an electronic device and then inserted into a document. Another example of a simple digital signature is the email signature that we often add at the end of the email, and check the terms and conditions box in the software installation process.

The digital signature on a message provides a unique electronic binding of the identity of the signer to the origin of the message. A digital signature provides proof of the message origin and a method to verify the integrity of the message.

When a signer electronically signs a document, the signature is created using the signer's private key, which is always securely kept by the signer. The mathematical algorithm acts like a cipher, creating data matching the signed document, called a hash, and encrypting that data.

The most common example is a wet signature scanned by an electronic device and then inserted into a document. Another example of a simple digital signature is the email signature that we often add at the end of the email, and check the terms and conditions box in the software installation process.