What is a Certificate's Fingerprint
A certificate's fingerprint is the unique identifier of the certificate. Microsoft Internet Explorer calls it Thumbprint. Browsers tend to display it as if it were a part of the certificate. It is not a part of the certificate, but it is computed from it.
A fingerprint is the MD5 digest of the der-encoded Certificate Info, which is an ASN.1 type specified as part of the X.509 specification.
The Certificate Fingerprint is a digest (hash function) of a certificate in x509 binary format. It can be calculated by different algorithms, such as SHA1 for Microsoft Internet Explorer, and MD5 for Netscape Navigator.
To check a certificates fingerprint/thumbprint, perform the following steps: