Patent attributes
A client maintains a pinned collection of trusted digital certificates. An original digital certificate in the collection may be updated by sending a request to the certificate authority that issued the original digital certificate. The certificate authority generates an updated certificate, signs the updated certificate with a private key of the updated certificate, and also signs the updated certificate with the private key of the original digital certificate. The server provides the updated certificate to the client. The client can validate the signature created with the updated private key using the updated public key of the certificate authority, and the signature created with the original private key can be validated using the original public key of the certificate authority. If both signatures are valid, a continuity of trust may be established, and the updated certificate added to the collection of trusted digital certificates.
