System for advanced protection of consumable or detachable elements
First Claim
1. A method of data transfer between a 1st consumable or detachable element of a continuous inkjet printer and this continuous inkjet printer, said 1st consumable, or detachable element, comprising a 1st encryption algorithm and a 1st secret key, as well as at least one item of data, encrypted with a 2nd encryption algorithm and a 2nd key, termed the shared key, said continuous inkjet printer also comprising said 2nd encryption algorithm, said 2nd shared key being stored in at least one of said 1st consumable or detachable element and of said continuous inkjet printer, the method wherein:
- a)—
at least one item of data, encrypted with said shared key, is transferred from said 1st consumable or detachable element to the continuous inkjet printer or from said continuous inkjet printer to said 1st consumable or detachable element;
b)—
when at least one item of data, encrypted with said shared key, is transferred from said 1st consumable or detachable element to the continuous inkjet printer, said continuous inkjet printer deciphers, with help of said shared key, said at least one item of data.
0 Assignments
0 Petitions
Accused Products
Abstract
A method of authenticating a consumable or detachable element of a continuous inkjet printer comprising: the controller of the printer generating a 1st item of random information that is dispatched to an authentication circuit of the element; encrypting the 1st item of information by the authentication circuit using a 1st encryption algorithm and a 1st secret key to form a 1st item of encrypted random information; dispatching the 1st item of information to the controller; encrypting the 1st item of information by the controller using a 2nd encryption algorithm and a 2nd secret key to form a 2nd item of encrypted random information; comparing the 1st item of encrypted random information with the 2nd encrypted item of random information to authenticate the consumable element; and if the consumable element is authenticated, dispatching at least one part of a 3rd key, termed the shared key, by the element to the printer.
-
Citations
20 Claims
-
1. A method of data transfer between a 1st consumable or detachable element of a continuous inkjet printer and this continuous inkjet printer, said 1st consumable, or detachable element, comprising a 1st encryption algorithm and a 1st secret key, as well as at least one item of data, encrypted with a 2nd encryption algorithm and a 2nd key, termed the shared key, said continuous inkjet printer also comprising said 2nd encryption algorithm, said 2nd shared key being stored in at least one of said 1st consumable or detachable element and of said continuous inkjet printer, the method wherein:
-
a)—
at least one item of data, encrypted with said shared key, is transferred from said 1st consumable or detachable element to the continuous inkjet printer or from said continuous inkjet printer to said 1st consumable or detachable element;b)—
when at least one item of data, encrypted with said shared key, is transferred from said 1st consumable or detachable element to the continuous inkjet printer, said continuous inkjet printer deciphers, with help of said shared key, said at least one item of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A consumable or detachable element for a continuous inkjet printer, (CU), comprising:
-
a circuit implementing a 1st encryption algorithm and a 1st key, termed the secret key; a memory storing at least one item of data, encrypted with a 2nd key, termed the shared key, said at least one item of data to be transferred to said printer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification