Patent ID: 9294285
Filing Date: 2016-03-22
CPC Classification: H04L

Claim Text:
1. An information recording device comprising a data storage portion and a controller, wherein the data storage portion stores a medium device key certificate (Certmedia) and an encrypted medium device key (Enc (Kcu, Kmd_i)) generated by encrypting a medium device key (Kmd_i) using a controller unique key (Kcu), and the controller stores a controller key (Kc) and first controller identification information (IDcu), the information recording device being configured to generate a shared key that is also generated by a host device and used to establish a secure channel wit the host device, by: (i) generating a first random number (RNm), (ii) sending the first random number (RNm) and the medium device key certificate (Certmedia) to the host device, (iii) generating a second random number (Mk) and calculating a value (Mv) by using abase point (G) of an elliptic curve, and (iv) generating medium signature information by using the medium device key (Kmd_i),which is generated by decrypting the encrypted medium device key (Enc(Kcu, Kmd_i)using the controller unique key (Kcu),the value (Mv), a host random number (RNh), and a controller unique ID(IDcntr), wherein the controller unique ID (IDcntr),is generated from the controller key (Kc) and the first controller identification information (IDcu).