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TB003 Datasheet(PDF) 3 Page - Microchip Technology

Part # TB003
Description  An Introduction to KELLOQ짰 Code Hopping
Download  12 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TB003 Datasheet(HTML) 3 Page - Microchip Technology

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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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