Secure boot method and method of generating a secure boot image

PURPOSE: A security booting method and a security booting image generating method are provided to authenticate a booting image by using a unique key and to perform security booting through an authenticated booting image. CONSTITUTION: An initial boot loader verifies a first digital signature included in a first boot loader by using a public key(S211). A processor core executes the first boot loader in case the first digital signature is effective(S212,S220). The first boot loader verifies a first message authentication code included in the second boot loader by using an eigen key(S221). The processor core executes the second boot loader(S222).