Authentication of entitlement authorization in conditional access systems
First Claim
1. In a terminal of a conditional access system in which a user selects a service associated with a frequency, the terminal having a tuner and a secure element with at least one authorized entitlement unit number stored therein, a method of determining whether the terminal is authorized to receive the selected service having at least one component, the method comprising steps of:
- receiving at least one entitlement management message including an authorized multi-session key;
receiving, over an out of band data link, at least one entitlement control message corresponding to the service, wherein each entitlement control message includes the at least one authorized entitlement unit number, a packet identifier (PID) and a payload, wherein the authorized multi-session key is changed infrequently and reveals encrypted control words for each of the at least one component, the encrypted control words changing frequently;
authenticating each of the at least one entitlement control messages in the secure element, each authenticated entitlement control message revealing at least one first entitlement unit number associated with the selected service and at least one control word associated with the selected service, wherein the at least one first entitlement unit number and the at least one control word are carried in the payload; and
determining that the terminal is authorized to receive the selected service when any first entitlement unit number of any authenticated entitlement control message corresponds to an authorized entitlement unit number, wherein the authorized entitlement unit number corresponds to a group of services that a receiver is authorized to receive.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for determining whether the terminal is authorized to receive the selected service is practiced in a terminal of a conditional access system in which a user selects a service, the selected service being associated with a frequency, the terminal having a tuner and a secure element with at least one authorized entitlement unit number stored therein. The method includes receiving at least one encrypted entitlement control message corresponding to the service, and decrypting each of the at least one encrypted entitlement control message in the secure element, each decrypted entitlement control message revealing at least one first entitlement number associated with the selected service. The method further includes determining that the terminal is authorized to receive the selected service when any first entitlement number of any decrypted entitlement control message represents any number of the at least one authorized entitlement unit number. Alternatively, the method includes receiving at least one entitlement control message corresponding to the service, and authenticating each of the at least one entitlement control message in the secure element, each authenticated entitlement control message revealing at least one first entitlement number associated with the selected service. The method further including determining that the terminal is authorized to receive the selected service when any first entitlement number of any authenticated entitlement control message represents any number of the at least one authorized entitlement unit number.
165 Citations
18 Claims
-
1. In a terminal of a conditional access system in which a user selects a service associated with a frequency, the terminal having a tuner and a secure element with at least one authorized entitlement unit number stored therein, a method of determining whether the terminal is authorized to receive the selected service having at least one component, the method comprising steps of:
-
receiving at least one entitlement management message including an authorized multi-session key; receiving, over an out of band data link, at least one entitlement control message corresponding to the service, wherein each entitlement control message includes the at least one authorized entitlement unit number, a packet identifier (PID) and a payload, wherein the authorized multi-session key is changed infrequently and reveals encrypted control words for each of the at least one component, the encrypted control words changing frequently; authenticating each of the at least one entitlement control messages in the secure element, each authenticated entitlement control message revealing at least one first entitlement unit number associated with the selected service and at least one control word associated with the selected service, wherein the at least one first entitlement unit number and the at least one control word are carried in the payload; and determining that the terminal is authorized to receive the selected service when any first entitlement unit number of any authenticated entitlement control message corresponds to an authorized entitlement unit number, wherein the authorized entitlement unit number corresponds to a group of services that a receiver is authorized to receive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A system in which a user selects a service having at least one component, the service associated with a frequency, the system comprising:
-
a tuner; and a processor communicatively coupled to the tuner and including a secure element, the processor configured to; receive at least one entitlement management message including an authorized multi-session key; receive, over an out of band data link, a transport stream comprising a plurality of packets having different packet types, one packet type comprising at least one entitlement control message corresponding to the service, wherein each entitlement control message includes at least one authorized entitlement unit number, a packet identifier (PID) and a payload, wherein the authorized multi-session key is changed infrequently and reveals encrypted control words for each of the at least one component, the encrypted control words changing frequently, the PID uniquely identifying the packet corresponding to the entitlement control message from the other packet types; authenticate each of the at least one entitlement control messages in the secure element, each authenticated entitlement control message revealing at least one first entitlement unit number associated with the selected service and at least one control word associated with the selected service, wherein the at least one first entitlement unit number and the at least one control word are carried in the payload; and determine that the terminal is authorized to receive the selected service when the first entitlement unit number of any authenticated entitlement control message corresponds to an authorized entitlement unit number, wherein the authorized entitlement unit number corresponds to a group of services that a receiver is authorized to receive. - View Dependent Claims (14, 15)
-
-
16. In a terminal of a conditional access system in which a user selects a service associated with a frequency, the terminal having a tuner and a secure element with at least one authorized entitlement unit number stored therein, a method of determining whether the terminal is authorized to receive the selected service having at least one component, the method comprising steps of:
-
receiving at least one entitlement management message including an authorized multi-session key; receiving, over an out of band data link, at least one encrypted entitlement control message corresponding to the service, wherein each entitlement control message includes the at least one authorized entitlement unit number, a packet identifier (PID) and a payload, wherein the authorized multi-session key is changed infrequently and reveals encrypted control words for each of the at least one component, the encrypted control words changing frequently; decrypting each of the at least one encrypted entitlement control messages in the secure element, each decrypted entitlement control message revealing at least one first entitlement unit number associated with the selected service and at least one control word associated with the selected service, wherein the at least one first entitlement unit number and the at least one control word are carried in the payload; authenticating each of the at least one decrypted entitlement control messages in the secure element using a keyed secure hash; and determining that the terminal is authorized to receive the selected service when the first entitlement unit number of any decrypted entitlement control message corresponds to an authorized entitlement unit number, wherein the authorized entitlement unit number corresponds to a group of services that a receiver is authorized to receive. - View Dependent Claims (17, 18)
-
Specification