Browse Prior Art Database

Algorithim to Inhibit Record/Play in a Non-Display Field

IP.com Disclosure Number: IPCOM000100504D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 4 page(s) / 98K

Publishing Venue

IBM

Related People

Inomata, T: AUTHOR [+3]

Abstract

Disclosed is an algorithm for inhibiting record or play mode in a non-display field in which confidential information, such as a personal password, is displayed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Algorithim to Inhibit Record/Play in a Non-Display Field

       Disclosed is an algorithm for inhibiting record or play
mode in a non-display field in which confidential information, such
as a personal password, is displayed.

      Prior display terminals offer the Record/Play function which
provides a mechanism to allow a frequently used key-stroke sequence
to be stored (recorded) and retrieved (played) by a terminal
operator.  This function facilitates the operator's creation of memos
by storing his/her frequently used key-stroke sequences and then
reproducing them in play mode.  Since this function is sometimes used
as a 'LOGON process' with a 'Password' so that the operator can logon
easily, the confidential data/information will be leaked out if
another operator plays it back.

      If the terminal can protect the key-in (record/play) in a non-
display field, the confidential data will not be recorded and will
not play back.  Then the operator can use this function without
paying any attention to record.

      Even if the operator records the logon sequence under
simulation of a logon panel, the play back will be inhibited in
non-display field.

      Under the configuration of a terminal, as shown in Fig. 1, the
MPU processes the appropriate tasks which are programmed in ROS
(Control Program/Microcode).  MPU can read the Scan code (keyboard
data) and refresh buffer (presentation space).  The terminal has the
NVM (Non- Volatile Memory) to keep the key-sequence.  The terminal
can communicate with the Host/Controller.

      On the screen, the non-display field where the operator cannot
see any character is set, as shown in Fig. 2.  The refresh buffer
corresponds with the screen, and the write pointer is at t...