Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A  |  B  |  C  |  D  |  E  |  F  |  G  |  H  |  I  |  J  |  K  |  L  |  M  |  N  |  O  |  P  |  Q  |  R  |  S  |  T  |  U  |  V  |  W  |  X  |  Y  |  Z

Certificate class


  A CA-designation (e.g., "class 0" or "class 1") indicating how thoroughly the CA checked the validity of the certificate. Per X.509 rules, the "class" should be encoded in the certificate as a CP extension: the CA can insert an object identifier (OID) that designates the set of procedures applied for the issuance of the certificate. These OIDs are CA-specific and can be understood only by referring to the CA's Certification Practice Statement.
NIST SP 800-57 Part 2 Rev.1