. In addition to the digital signature, a certificate contains the name of the certification authority, the name or identity of
the holder, thepublic key of
the holder, the validity period and is digitally signed by the certification authority (CA).The
authenticity of the keys is verified by
.The Digital Signature Act defines the term certificate as follows: For the purposes of this Act, a certificate is a digital attestation, provided with a digital signature, of the assignment of a public signature key to a natural person (signature key certificate) or a separate digital attestation containing further information with clear reference to a signature key certificate (attribute certificate).
(PKI). If, on the other hand, the purpose isto encryptmessages, files or documents
and the certificate contains a public key, then it is an encryption certificate. There are several formats for the structure of the certificate.