Recommendation ITU-T X.510 | ISO/IEC 9594-11 specifies a general protocol, called the wrapper protocol, that provides cyber security for protocols designed for protection by the wrapper protocol. The wrapper protocol provides authentication, integrity and optionally confidentiality (encryption). The wrapper protocol allows cyber security to be provided independently of the protected protocols, which means that the security may be enhanced without affecting protected protocol specifications. The wrapper protocol is specified without specifying specific cryptographic algorithms but is designed for plucking-in cryptographic algorithms as required. The wrapper protocol is designed for easy migration of cryptographic algorithms, as stronger cryptographic algorithms become necessary. Recommendation ITU-T X.510 | ISO/IEC 9594-11 contains recommendations for how other Recommendations and International Standards may include features for migration of cryptographic algorithms, and it includes ASN.1 specifications to be applied for that purpose. Recommendation ITU-T X.510 | ISO/IEC 9594-11 also specifies three protocols that make use of the protection of the wrapper protocol. This includes a protocol for maintenance of authorization and validation lists (AVLs), a protocol for subscribing of public-key certificate status and a protocol for accessing a trust broker.