Digital Certificate

In cryptography, a digital certificate (or identity certificate) is a certificate which uses a digital signature to bind together a public key with an identity — information such as the name of a person or an organization, their address, and so forth. The certificate can be used to verify that a public key belongs to an individual, which is used to achieve data confidentiality, authenticity and message integrity.

From: Wikipedia / Digital certificate (http://en.wikipedia.org/wiki/Digital_certificate)