Browse Prior Art Database

Cryptographic Communication Key Entry Unit

IP.com Disclosure Number: IPCOM000047216D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 47K

Publishing Venue

IBM

Related People

Papas, GG: AUTHOR

Abstract

This article discloses a personalization/key-entry unit (KEU) which is a hand-held data entry device that pluggably attaches to an encrypting device. The unit is designed to enter data through a keyboard and display the data so that it can be checked to ensure that the correct data was inserted into the encrypting device. The KEU contains an 18-key-button keyboard 2, a luminous 16-digit hex display 4 and logic for controlling the operation of the unit. The KEU allows entry of 4-character personalization data, which adapts the encrypting device to its communication environment, i.e., start-stop personalization, bisync personalization, or synchronous data link personalization and to different speeds.

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Cryptographic Communication Key Entry Unit

This article discloses a personalization/key-entry unit (KEU) which is a hand- held data entry device that pluggably attaches to an encrypting device. The unit is designed to enter data through a keyboard and display the data so that it can be checked to ensure that the correct data was inserted into the encrypting device. The KEU contains an 18-key-button keyboard 2, a luminous 16-digit hex display 4 and logic for controlling the operation of the unit. The KEU allows entry of 4-character personalization data, which adapts the encrypting device to its communication environment, i.e., start-stop personalization, bisync personalization, or synchronous data link personalization and to different speeds. The KEU also allows entry of seed data consisting of any hexadecimal character or combination of hexadecimal characters to a maximum of 16 as an initial starting point for a synchronizing message which is used to initialize the encrypting circuits of the receiving device with those of the transmitting device. The KEU is additionally used to enter a cryptographic key in the form of 16 randomly selected hexadecimal characters each, however, being chosen to have odd parity, so that each pair of hex characters forming a byte will also have odd parity. The keyboard keys are designated with both alphabetic and numeric characters and include a clear (CLR) key and a clear entry (CE) key. The CLR key is for clearing the full display leaving a zero in the upper left-hand corner of the display 4A, while the CE key is used for blanking the last character displayed and backspacing one character. The CLR and CE keys, depressed in that order, are also used for disabling the parity checking circuit built in the logic module 6 and causing a dot to be displayed in the upper left-hand portion of the first character. The dot will remain displayed so that data, e.g., personalization or seed data, which could contain odd or even parity, can be inserted without parity checking until the CLR key is depressed or the KEU is disconnected from the encrypting device. The luminous display is in two rows, eac...