What is a 'digital signature'?

A digital signature is essentially a mathematical scheme for verifying the authenticity and integrity of a message, software, or digital document. It is created using cryptographic techniques, making it unique to both the document and the signer. When a document is signed digitally, it ensures that the document has not been altered since it was signed and confirms the identity of the signer. This process is crucial for document verification because it helps build trust, particularly in transactions and communications conducted over the internet.

In contrast, while an electronic version of a handwritten signature might seem similar, it does not carry the same level of security or verification tied to cryptographic processes, which is foundational to digital signatures. An encrypted message for secure communication deals with protecting the content of a message rather than verifying the identity of the sender and ensuring the integrity of a document. Lastly, a tool for digital art creation does not pertain to the legal and security aspects that digital signatures embody. Therefore, the choice concerning electronic signatures for document verification aptly captures the essence and purpose of a digital signature.