# US 2004/0073802 A1 · User identification with an improved password input method

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- Number: US 2004/0073802 A1
- Document ID: US20040073802A1
- Status: Published application
- Kind: A1
- Application number: 10/468,160
- Filed: 2003-08-28
- Published: 2004-04-15
- Earliest claimed: 2001-03-02
- Inventors: Dong-Seok Seol
- Web page: https://patentgrep.com/patent/US20040073802A1

## CPC

- G06F 21/31: User authentication
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

The present invention relates to a user identification method that uses an indirect password. This method allows a password control system to identify a user with a received value, which is calculated by a predetermined function known to both the user and the password control system, and a value of a variable. The variable being provided from the password control system. According to the present invention, the password is less likely to be misappropriated in the input stage and interception on the transmission line by hacking would be futile.

## Claims

### Claim 1

A method for identification of a user by the input of an indirect password comprising:
registering a password input method as a function composed of variables which are agreed with or assigned by a password control system; and
comparing an identifier and a password input by the user for identification with the variables which are agreed to or assigned by a password control system and a value calculated by the registered function.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the password control system comprises
a password memory (1) for storing a password for an identifier;
a password input method memory (2) for storing an equation or a function having a basic variable of a password for the same identifier;
a reference variable memory (3) for storing variables, which are referred to when the user inputs, and a reference signal, management, device (4) for managing reference signals;
an output device (5);
a channel memory (6) for specifying a kind of exercise of authorities for the identifier;
an input device (7) to which the user inputs a result;
a response time memory (8) for storing a time for responding to the input;
a central processing unit (9) for comparing/analyzing the inputted response time and the result, identifying whether the registered password and the equation are known, and conducting/managing a process of the channel required by the user;
a temporary memory (10) necessary in processing;
an output port (11) communicated with the outside; and
a communication line (12) for transmitting/receiving signals among the above elements,
and wherein the method comprises the steps of
inputting an identifier which the user wishes to use (21);
inputting an indirect password by the user which is processed by the pre-registered password input method and reference signals, reference variables, constants and channel provided by the password control system (22);
classifying the result input by the user into an effective one and channel, and recalculating a response time according to a predetermined calculation method (23);
determining whether the inputted response time is within the response time which the user defined and comparing/analyzing the inputted response time with the result calculated by the password control system (24);
if the results are in accord with each other, assuming that the user is the right person for the identifier, conducting a process corresponding to the required channel (25); and
if the result input by the user is not in accord with the result calculated by the system, conducting a process for an unauthorized user (26).

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein unnecessary data can be inserted or the channel which defines a process classifying the user's authorities can be input together, when variables provided by the password control system and the indirect password calculated by the function defined in advance are input.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein authorities of the identifier are classified by channels and different processes are provided according to the channel input by the user.

### Claim 5 (depends on 1)

The method as claim in claim 1, wherein the response time in which the user inputs the password is checked.