Cryptographic device, system and method therof

A cryptographic method, including:

• generating a private key according to hardware-intrinsic properties in a first device;
• generating a public key according to the private key, into a second device for encrypting the communication payload information into first encrypted information based on the public key;
• and
• encrypting the first encrypted information into second encrypted information according to a session key, to transmit the second encrypted information between the first and second devices.

A cryptographic system, including:

• an outside device;
• and
• a cryptographic device, communicating with the outside device through a dual-path authenticated key-exchange security mechanism, the cryptographic device including:
• a hardware unit, exhibiting hardware-intrinsic properties;
• a key generating unit, generating a private key according to the hardware-intrinsic properties, and generating a public key according to the private key, for exchanging public keys with the outside device to encrypt communication payload information into first encrypted information based on the received public key;
• and
• a session operational unit, establishing a session key configured to encrypt the first encrypted information into second encrypted information, to transmit the second encrypted information between the cryptographic device and the outside device.