What is a digital signature?

A digital signature serves as a critical tool in validating both the authenticity and integrity of a message or document. It operates as a unique electronic proof that a specific individual or entity has approved the content of a communication or file. This authenticity is achieved through cryptographic techniques, which ensure that the signature can only be created by the intended signer and that any changes made to the document after signing will render the signature invalid.

In contexts where secure transactions or communications are necessary, such as online banking or electronic contracts, digital signatures provide a robust mechanism for trust. They ensure that the document has not been altered in any way during transmission, thus preserving its integrity. This functionality makes digital signatures indispensable in maintaining the security and reliability of electronic communications in today's digital environment.