US5261070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming unique user identification data at remote terminal for secure transmission of data from host terminal
Assignee: Meiji Dairies Corp
•
Filing: 1990-09-20
•
Granted: 1993-11-09
•
Expires: 2010-09-20
Abstract
Abstract The present invention relates to a method and apparatus to determine whether a user is authorized to utilize a data communication network, and more particularly a terminal machine in the network. Data having a predetermined number of bits are read out from a relatively large random number memory, containing previously stored data, by using key data to address said bits at the terminal machine. The addressed data are used as new key data and data each having a predetermined number of bits are repeatedly read from the data in the random number memory to form identification data on the basis of the old and new key data in each cycle. In such manner, there are formed identification data unequivocally determined in accordance with the key data and having high security or confidentiality.
Inventors
- 👤 Junichi Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/30; G06F21/31; H; H04; H04L; H04L9/00; H04L9/32; H04L9/3226
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
321 words
A method for forming identification data for use in a computer system including a host machine and a user terminal machine, comprising the steps of: transmitting to the user terminal machine from the host machine a number L representing a length of the identification data and key data in response to a user entering a password in the user terminal machine; reading out random number data having a prescribed number of bits equal to a number of bits of said key data from a random number memory in the user terminal machine by addressing said random number memory using said key data, said random number memory having previously stored therein a relatively large number of bits compared to said prescribed number, said large number being within a range to permit use as random number data, and said random number data being read out from said random number memory forming a portion equal to 1/L of the identification data; generating new key data at the user terminal machine, at least a part of said new key data being formed by said portion of identification data having said prescribed number of bits read out from said random number memory; reading out, from said random number memory, new identification data having said prescribed number of bits from said random number data containing a relatively large number of bits by addressing said random number memory using said new key data; and repeatedly performing a number of times equal to said number L the operation of reading out the new data from said random number memory by addressing said random number with successive new key data and forming identification data having a length given by said number L times said prescribed number of bits; and transmitting said identification data having a length given by said number L times said prescribed number of bits for storage in said host machine to subsequently identify said user terminal machine.
Claim 2
Independent Claim
321 words
A method for forming identification data for use in a computer system including a host machine and a user terminal machine, comprising the steps of: transmitting to the user terminal machine from the host machine a number L representing a length of the identification data and key data in response to a user entering a password in the user terminal machine; reading out random number data having a prescribed number of bits equal to a number of bits of said key data from a random number memory in the user terminal machine by addressing said random number memory using said key data, said random number memory having previously stored therein a relatively large number of bits compared to said prescribed number, said large number being within a range to permit use as random number data, and said random number data being read out from said random number memory forming a portion equal to 1/L of the identification data; generating new key data at the user terminal machine, at least a part of said new key data being formed by said portion of identification data having said prescribed number of bits read out from said random number memory; reading out, from said random number memory, new identification data having said prescribed number of bits from said random number data containing a relatively large number of bits by addressing said random number memory using said new key data; and repeatedly performing a number of times equal to said number L the operation of reading out the new data from said random number memory by addressing said random number with successive new key data and forming identification data having a length given by said number L times said prescribed number of bits; and transmitting said identification data having a length given by said number L times said prescribed number of bits for storage in said host machine to subsequently identify said user terminal machine.
Claim 3
Dependent Claim
35 words
A method according to claim 1 further comprising the step of subjecting said key data and each new key data to an irreversible function processing to form address data for addressing said random number memory.
Claim 4
Dependent Claim
32 words
A method according to claim 1 including the further step of incorporating said identification data with said new key data in the host machine for subsequent transmission to the user terminal machine.
References Cited (Backward Citations)
US3798605A
Cited
US4255811A
Cited
US4011545A
Cited
US4238854A
Cited
US4310720A
Cited
US4281215A
Cited
US4218738A
Cited
US4283599A
Cited
US4349695A
Cited
CA1189925A
Cited
US4304961A
Cited
US4386416A
Cited
US4450535A
Cited
WO1983001881A1
Cited
US4531023A
Cited
US4757468A
Cited
US4652990A
Cited
US4630201A
Cited
US4780905A
Cited
US4779224A
Cited
US4733345A
Cited
US4791669A
Cited
US4868045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |