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TB003 Datasheet(PDF) 3 Page - Microchip Technology |
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TB003 Datasheet(HTML) 3 Page - Microchip Technology |
3 / 12 page Ó 1996 Microchip Technology Inc. DS91002A-page 3 TB003 DEFINITIONS USED IN CODE HOPPING Transmitter Serial Number Each transmitter is programmed with a unique 28- or 32-bit serial number at the time of transmitter manufacture. This ensures that each transmitter will be unique within a system. Secret Key This 64-bit secret key is generated by a key generation function from the 28- or 32-bit serial number or the 32- or 48-bit seed and 64-bit manufacturer's key as inputs. A manufacturer’s key can be used to control the key generation func- tion. The secret key is not readable and is never transmitted. Seed The seed is a 32- or 48-bit value that is programmed into the encoder. This can be programmed to be the same as one half of the key or be used in key gener- ation. It is only transmitted when a specific button combination is activated and can be disabled once learning is completed. Key Generation The key generation function is used to generate a unique key for each trans- mitter from the serial number or seed value. It is preferable that the function is nonlinear. This function is performed by the programming station to generate keys to be programmed into transmitters. Manufacturer's Key The manufacturer’s key is necessary in the receiver if a key generation func- tion with a manufacturer’s was used to generate the secret keys. The manufac- turer's key must be programmed into the receiver during manufacture. Normal Learn (Serial Number Derived) The receiver uses the same information that is transmitted during normal oper- ation to derive the transmitter’s secret key, decrypt the discrimination value and the synchronization counter. All the transmitter information is then stored. Secure learn (Seed Derived) The transmitter is activated through a special button combination to transmit a stored 32- or 48-bit value (seed) that can be used for key generation or be part of the key. Transmission of the random seed can be disabled after learning is completed. Discrimination value The discrimination value is a 12-bit fixed portion of the encrypted word. It is used as a post decryption check. Synchronization counter A16-bit counter that is incremented on every activation of the encoder. It is stored on the receiver controller and compared to determine if a transmission is a previously received transmission, in which case it is ignored or falls within a forward window in which case it is accepted. |
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