Abstract: An authentication method and system are provided for devices in a home network. The device authentication method includes: storing a secret key list that contains IDs of computationally weak devices without public key operational capabilities, each ID being provided from the respective computationally weak device, and secret keys corresponding to the IDs; receiving session information including a session from a computationally weak device; operating the session information based on the secret key list, and authenticating the computationally weak device; if the computationally weak device is authenticated, generating authentication acknowledgement information about the session information and the authentication of the computationally weak device, and transmitting the information to a general device with public key operational capabilities; and at the general device, carrying out an operation on the received session information and extracting the session.

Abstract: A security device for a home network and a security configuration method thereof. The security device for the home network includes a user interface to send at least one request signal that includes a device register request signal to register a home appliance to the home network; a public key generator to generate a public key and a password used for security configuration of the home network; a home appliance interface to interface with the home appliance; and a controller to control the home appliance interface to transmit the public key and the password to the home appliance, and the controller to control to register the home appliance to the home network according to a service discovery protocol when the device register request signal is received from the user interface. Accordingly, the security configuration of the home network can be facilitated.

Abstract: An elliptic curve cryptography method which generates a public key for use in a communication encryption using an elliptic curve, including: changing a number of a secret key (d) of (k) bits to an odd number; encoding the secret key to yield an encoded secret key (d) in which a most significant bit (MSB) is (1) and a rest positional number is (1) or (?1); and computing the public key (Q=Dp) by multiplying the encoded secret key (d) by a predetermined point (P) on the elliptic curve by a scalar multiplication.

Abstract: A conference session key distribution method used in an ID-based cryptographic system includes selecting two different temporary secret keys, generating a message and generating session key generation variables using the temporary secret keys of a session initiating party. Only valid participating parties receive the session key generation variables. Each party determines the session shared key from the session key generation variables.

Abstract: A security system using an RSA algorithm that includes a key input section for receiving a secret key and a public key used in one of encryption and decryption of a message, a random coefficient generating section for generating a random coefficient r having a bit of a predetermined size, a first calculation section for dividing the secret key into a first secret key and a second secret key by using the value of r, and performing an exponentiation of RSA algorithm by using the respective secret keys and the public key, and a second calculation section for performing one of the encryption and the decryption by combining results of exponentiation calculated respectively by using the first and the second secret keys.