Secure key authentication and ladder system

摘要

Method and system for secure key authentication and key ladder are provided herein. Aspects of the method for secure key authentication may include generating a digital signature of a secure key in order to obtain a digitally signed secure key and transmitting the digitally signed secure key from a first location to a second location. The digital signature may be generated by utilizing an asymmetric encryption algorithm and/or a symmetric encryption algorithm. The digitally signed secure key may be encrypted prior to transmission. The secure key may be a master key, a work key and/or a scrambling key. The digitally signed secure key may be received at the second location and the digitally signed secure key may be decrypted to obtain a decrypted digitally signed secure key.

主权项

1. A conditional access system for preventing unauthorized receipt of broadcast signals, the system comprising:
a key generating unit configured to generate a plurality of keys; a key signing unit, coupled to the key generating unit, configured to sign at least two of the plurality of keys to generate first and second signed keys; and an encryption unit, coupled to the key signing unit, configured to encrypt the first and second signed keys to generate first and second encrypted and signed keys; wherein the second signed key is encrypted to generate the second encrypted and signed key using the first encrypted and signed key, and the first signed key is encrypted to generate the first encrypted and signed key using a master key; and a transmitter configured to transmit the first and second encrypted and signed keys, and to broadcast signals scrambled using the second signed key.