Method and device for managing certificates

A certificate management method and a certificate management device are disclosed. The certificate management device includes a key collection computing unit, a certificate revocation unit, and a certificate revocation list broadcast unit. The certificate management method includes determining to at least revoke a first certificate in certificates that are recorded in a key tree and related to an entity, and determining whether a first root node covers one first certificate and one other revoked certificate in the key tree. When the first root node covers one first certificate and one other revoked certificate, information about the first root node is added to a certificate revocation list. The certificate revocation list is sent to another entity at least.