X.509 is a standard that dictates the format of public key certificates. These certificates are important in cryptographic systems as they verify the identity of individuals, businesses or servers. They are common in secure communication methods such as HTTPs.

Examples of X.509

Understanding X.509 Certificates

X.509 certificates include crucial information like public key, owner’s name, validity dates, issuer, serial number and issuer digital signature. The certificate authorities (CAs) are responsible for issuing the certificates. 

Comparing X.509 to Other Certificates

X.509 adopts a hierarchical trust approach, unlike other standards, such as PGP. Based on this model, the certificate authority must issue the certificate as opposed to PGP, which relies on a web of trust model for users to vouch for each other.

Advantages and Disadvantages of X.509 Certificates