SAFETY CONNECTION TO KEYBOARD OR RELATED DEVICE Russian patent published in 2009 - IPC G06F3/02 G06F1/00 G06F21/00 G09C1/00 

FIELD: information technologies.

SUBSTANCE: first initial value is known both to the keyboard and the component. Keyboard and component exchange time values. Both the keyboard and the component compute the second initial value and the third initial value on the basis of time values and the first initial value. Both the keyboard and the component make one and the same computation so that both the keyboard and the component have one and the same second and third initial values. The keyboard encodes keystrokes meant for the component by using CBC-3DES method on the basis of the key and the second initial component, as well as creates message authentication code for each keystroke by using CBC-3DESMAC on the basis of the key and the third initial value. The component encodes and verifies keystrokes by using the key and the second and the third initial values.

EFFECT: providing safety connection between two components, such as a keyboard or a related device, and software component via an unsafe communication channel.

26 cl, 6 dwg