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In cryptography and computer security, a root certificate is a public key certificate that identifies a root certificate authority (CA). [1] Root certificates are self-signed (and it is possible for a certificate to have multiple trust paths, say if the certificate was issued by a root that was cross-signed) and form the basis of an X.509 ...
The roles of root certificate, intermediate certificate and end-entity certificate as in the chain of trust. In computer security, a chain of trust is established by validating each component of hardware and software from the end entity up to the root certificate. It is intended to ensure that only trusted software and hardware can be used ...
Once the root CA is installed and its root certificate is created, the next action taken by the administrator of the root CA is to issue certificates authorizing intermediate (or subordinate) CAs. This creates the ability to issue, distribute and revoke digital certificates without the direct action of the root CA.
The root certificate was used to sign two intermediate certificates, [44] which are also cross-signed by the certificate authority IdenTrust. [ 7 ] [ 45 ] One of the intermediate certificates is used to sign issued certificates, while the other is kept offline as a backup in case of problems with the first intermediate certificate. [ 44 ]
A certificate authority self-signs a root certificate to be able to sign other certificates. An intermediate certificate has a similar purpose to the root certificate – its only use is to sign other certificates. However, an intermediate certificate is not self-signed. A root certificate or another intermediate certificate needs to sign it.
CAs typically take the further precaution of keeping the key for their long-term root certificates in an HSM that is kept offline, except when it is needed to sign shorter-lived intermediate certificates. The intermediate certificates, stored in an online HSM, can do the day-to-day work of signing end-entity certificates and keeping revocation ...
Currently the majority of web browsers are shipped with pre-installed intermediate certificates issued and signed by a certificate authority, by public keys certified by so-called root certificates. This means browsers need to carry a large number of different certificate providers, increasing the risk of a key compromise.
In public-key cryptography and computer security, a root-key ceremony is a procedure for generating a unique pair of public and private root keys. Depending on the certificate policy of a system, the generation of the root keys may require notarization, legal representation, witnesses, or “key-holders” to be present.