 |
|
|
|
|
|
 Title: |
US4135240:
Protection of data file contents
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Ritchie, Dennis M.; Summit, NJ
|
| Assignee: |
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ
other patents from AT&T CORP. (706518) (approx. 16,328)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1979-01-16
/ 1973-07-09
|
| Application Number: |
US1973000377591
|
| IPC Code: |
Advanced:
G06F 1/00;
G06F 21/00;
Core:
more...
IPC-7:
G06F 11/10;
G06F 13/00;
|
| ECLA Code: |
G06F21/00N9A2T;
|
| U.S. Class: |
Current:
711/164;
Original:
364/200;
|
| Field of Search: |
340/172.5
364/200 MS File,900 MS File
|
| Priority Number: |
| 1973-07-09 |
US1973000377591 |
|
| Abstract: |
An improved arrangement for controlling access to data files by computer users. Access permission bits are used in the prior art to separately indicate permissions for the file owner and nonowners to read, write and execute the file contents. An additional access control bit is added to each executable file. When this bit is set to one, the identification of the current user is changed to that of the owner of the executable file. The program in the executable file then has access to all data files owned by the same owner. This change is temporary, the proper identification being restored when the program is terminated.
|
| Attorney, Agent or Firm: |
Phillips, Stephen J. ;
|
| Primary / Asst. Examiners: |
Thomas, James D.;
|
| INPADOC Legal Status: |
Show legal status actions
|
| Family: |
None
|
First Claim:
Show all 4 claims |
What is claimed is:
1. In a computer system serving at least one external current user and having stored at least one file of executable program instructions owned by a file owner different from said current user,
- means for storing access control information in association with said file, including identification of said file owner and a control indicator having selectively either a first or a second binary state,
- means for sensing said first state of said control indicator, and
- means responsive to said first state of said control indicator for changing temporarily the identification of said current user of the computer system to that of said file owner during the execution of said program instructions,
- whereby said current user selectively may be given access by said computer system to files owned by said file owner during the execution of said program instructions.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 93 U.S. patent(s) that reference this one
|
