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Application Notes/
Technical Brief
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TB003
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Title:
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An Introduction to KEELOQ® Code Hopping Technical Brief
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Name:
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TB003
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Date:
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5/31/11
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Author:
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Kobus Marneweck
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Description:
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Remote control via RF or IR is popular for many applications, including vehicle alarms and automatic garage doors. Conventional remote control systems are based on unidirectional transmission and have limited security. More sophisticated devices based on bi-directional transmission are also available but, because of their high cost and certain practical disadvantages, they are not widely used in commercial remote control devices. The popular unidirectional transmission systems currently have two very important security shortcomings: the codes they transmit are usually fixed and the number of possible code combinations is relatively small. Either of these shortcomings can lead to unauthorized access.
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Keywords:
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Technical Brief, KEELOQ, Code Hopping
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Related Information
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App Notes and Source Code
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TB003
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