System for advanced protection of consumable or detachable elements

A control device of a continuous inkjet printer, or data medium, for authentication of a 1st consumable or detachable element of said continuous inkjet printer, the device comprising:

• a generator of an item of random information, and for despatching same to an authentication circuit of the element;
• an encryption circuit for encrypting this item of random information, using a 1st encryption algorithm and a 1st secret key, thereby forming an item of encrypted random information;
• a circuit to compare this item of encrypted random information and another item of encrypted random information received from a consumable or detachable element and for authenticating, or not, the 1st consumable as a function of the result of the comparison;
• a receiver receiving, after authentication, at least a part of a key, termed the shared key, dispatched by said consumable or detachable element to the control device;
• a memory storing a 2nd key, termed the shared key, and a 2nd algorithm, termed the deciphering algorithm, to decipher at least one data with the shared key.

A consumable or detachable element for a continuous inkjet printer, (CIJ), comprising:

• a generator to generate an item of random information, and a circuit to despatch this item of random information to a controller of a printer, or a receiver to receive an item of random information from the controller of a printer;
• a circuit to encrypt this item of random information, using a 1st encryption algorithm and a 1st key, termed the secret key, thereby forming an item of encrypted random information;
• a circuit to compare this item of encrypted random information and another item of encrypted random information received from the controller of a printer, and for authenticating, or not, said printer as a function of the result of the comparison;
• a receiver to receive, after authentication, at least a part of a 2nd key, termed the shared key, for example dispatched by said printer to the consumable or detachable element, or for despatching at least a part of a 2nd key, termed the shared key, for example to said printer;
• a memory to store said 2nd key, termed the shared key, and a 2nd algorithm, to decipher or encrypt at least one data with said shared key.