Secure communication with a keyboard or related device
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United States of America Patent
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Jul 10, 2007
Grant Date -
Nov 18, 2004
app pub date -
May 2, 2003
filing date -
May 2, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Secure communication between a keyboard and a component, such as a piece of software running on a computer. A first initial value is known to both the keyboard and the component. The keyboard and the component exchange nonces. The keyboard and the component each compute a second initial value and a third initial value based on the nonces and the first initial value. Both the keyboard and the component perform the same computation, so that the keyboard and the component each have the same second and third initial values. The keyboard encrypts keystrokes destined for the component using CBC-3DES based on the key and the second initial value, and also creates a message authentication code for each keystroke using CBC-3DESMAC based on the key and the third initial value. The component decrypts and verifies the keystrokes using the key and the second and third initial values.
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