ISO/IEC 29150:2011规定了四种签密机制，它们采用公钥加密技术，要求受保护数据的发送方和接收方都拥有自己的公钥和私钥对。ISO/IEC 29150:2011中规定的方法旨在最大限度地提高安全性，并提供高效的数据处理。所有定义的机制都有数学上的“安全证明”，即支持其安全主张的严格论据。 ISO/IEC 29150:2011不适用于ISO/IEC 11770-1和ISO/IEC 9594中定义的公钥管理基础设施。

ISO/IEC 29150:2011 specifies four mechanisms for signcryption that employ public key cryptographic techniques requiring both the originator and the recipient of protected data to have their own public and private key pairs. The methods specified in ISO/IEC 29150:2011 have been designed to maximize the level of security and provide efficient processing of data. All the mechanisms defined have mathematical "proofs of security", i.e. rigorous arguments supporting their security claims. ISO/IEC 29150:2011 is not applicable to infrastructures for management of public keys which are defined in ISO/IEC 11770-1 and ISO/IEC 9594.