CPK Cryptosystem changes ordinary elliptic curve public key into an identity-based public key with self-assured property. Self-assured public key can advance the authentication logic from object-authenticating "belief logic" to entity-authenticating "trust logic". Self-assured public key system and trust logic of authentication composes the key technique of cyber security. The construction of trust connecting,computing,transaction,logistics,counter-forgery and network management will be the main contents of the next generation of information security. Readers benefited from this book will be researchers and professors, experts and students, developers and policy makers, and all other who are interested in cyber security.