What is an SSL x.509 Certificate? An SSL Certificate is a digital computer file that has two specific functions: Authentication and Verification: The SSL Certificate has information about the authenticity of details around the identity of a host or site. When you click on the padlock displayed or check the trust mark the certificate chain I am trying to generate X509 certificates in C# code (using the class X509Certificate2) and upload these certificates to an Azure Key Vault. When I try to upload them (programmatically or via the A 3 Answers. Sorted by: 4. From what I remember, Windows machine accounts (like LocalService) use the machine certificate store. This means that in your code, you have to access the store with StoreLocation.LocalMachine. var store = new System.Security.Cryptography.X509Certificates.X509Store (StoreLocation.LocalMachine); Therefore the easiest way to found the digest algorithm is to use a mapping table OID -> digest algo. Unfortunately I know no centralized location where you can find these OID. However they can be collected in these RFC: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL A key use of X.509 certificates can be to authenticate the digital identities of devices, people, data and applications. TLS/SSL and web browser security. PKI and X.509 are the basis for the Transport Layer Security and Secure Sockets Layer protocols. Web browsers read the X.509 certificate of a webpage to verify its TLS/SSL status. somewhere along the way, either Win11 or the browsers (Chrome, Edge etc) decided to replace the SSL certificate option "Copy to File" and corresponding Certificate Export Wizard where you could choose to export in .cer format with an "Export" option, where you can only choose to save as .pem or .crt format. Gets a handle to an X.509 chain. ChainElements: Gets a collection of X509ChainElement objects. ChainPolicy: Gets or sets the X509ChainPolicy to use when building an X.509 certificate chain. ChainStatus: Gets the status of each element in an X509Chain object. SafeHandle: Gets a safe handle for this X509Chain instance. The "x5t" (X.509 certificate SHA-1 thumbprint) parameter is a base64url-encoded SHA-1 thumbprint (a.k.a. digest) of the DER encoding of an X.509 certificate [RFC5280]. Note that certificate thumbprints are also sometimes known as certificate fingerprints. The key in the certificate MUST match the public key represented by other members of the JWK. These certificates can be used to digitally sign and encrypt email, authenticate and authorize users connecting to websites and secure data transmission over the internet. Any application that supports the Secure Socket Layer Protocol (SSL or TLS) can make use of certificates signed by CAcert, as can any application that uses X.509 certificates I'd like to convert it into a PEM file containing the full certificate chain (i.e. in this case a file that starts with this certificate and then has two more BEGIN/END CERTIFICATE brackets containing Regulated CA 02 and Root CA IV). The certificate uses the Authority Information Access extension to list the download url to get the issuer 6umeHm.