Key management method, key calling method and cipher machine

The invention discloses a secret key management method, a secret key calling method and a cipher machine, and relates to the technical field of cipher machines, the secret key management method comprises the following steps: when a secret key update period is reached, encrypting a storage address of a secret key by using a randomly selected first secret key to obtain an address ciphertext; splitting the address ciphertext to generate address ciphertext fragments, and storing the address ciphertext fragments to different storage regions according to the fragment lengths of the address ciphertext fragments to generate a storage region sequence; obtaining a storage area sequence key, and encrypting the storage area sequence by using the storage area sequence key to obtain an encrypted sequence; and updating a key table according to the encryption sequence. According to the method, the key can be dynamically updated, the key storage security is greatly enhanced, and a potential attacker is effectively prevented f