Patent ID: 8793495
Filing Date: 2014-07-29
Classification: G06F,G06K,G06Q,G07F,H04L

Abstract:
1. A method for authenticating a portable data carrier to a terminal device comprising: providing from the data carrier to the terminal device a public group key (PKG) of the data carrier and a modified base value (gl), the public group key (PKG) being derivable from a secret group key (SKG) of the data carrier using a group key base value (g), and the modified base value (gl) being derivable from the group key base value (g) using a modification value (RND providing from the terminal device to the data carrier a public session key (PKT) of the terminal device, the public session key (PKT) being derivable from a secret session key (SKT) of the terminal device using the modified base value (gl); and agreeing on a key agreement key (KK) between the data carrier and the terminal device using the public group key (PKG) and a secret key (SK