JPS6433773A - Data falsification checking system - Google Patents
Data falsification checking systemInfo
- Publication number
- JPS6433773A JPS6433773A JP19119687A JP19119687A JPS6433773A JP S6433773 A JPS6433773 A JP S6433773A JP 19119687 A JP19119687 A JP 19119687A JP 19119687 A JP19119687 A JP 19119687A JP S6433773 A JPS6433773 A JP S6433773A
- Authority
- JP
- Japan
- Prior art keywords
- data
- positive
- bits
- recording
- checking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
PURPOSE:To check the propriety and the falsification of data by recording the data and checking data based on the number of positive or negative bits of recording data at the time of recording the data to a recording medium and checking the translation of the data by second checking data based on the number of the positive or the negative bits of reading data. CONSTITUTION:The number of the bits of the positive bits of writing data 1 is counted in the positive bit counting part 10 of a system to form the complement of the number counted in a bit inverting part 11. The checking data consisting of the complement of this inverting part 11 and the data 1 are written in a recording part 14 in a laser card 13 by a laser card writing part 12. The contents of the data part 15, the checking data part 16 of this card 13 are read to a laser reading part 17 and the number of the positive bits is counted in a positive bits counting part 18. In a bit inverting part 19, the complement of the data part 16 is formed and the abnormality of a value counted in the counting part 18 and the formed complement value is detected in an abnormal value detecting part 20.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191196A JPH0664842B2 (en) | 1987-07-30 | 1987-07-30 | Data tampering check method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191196A JPH0664842B2 (en) | 1987-07-30 | 1987-07-30 | Data tampering check method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6433773A true JPS6433773A (en) | 1989-02-03 |
JPH0664842B2 JPH0664842B2 (en) | 1994-08-22 |
Family
ID=16270503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62191196A Expired - Lifetime JPH0664842B2 (en) | 1987-07-30 | 1987-07-30 | Data tampering check method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0664842B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010058032A (en) * | 2008-09-03 | 2010-03-18 | Takushoo:Kk | Dust collector for sheet work |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5797187A (en) * | 1980-10-13 | 1982-06-16 | Kopitetsukusu Gmbh Zuitsuhiaah | Method of preventing rewriting of information only recorded on data holder and apparatus for recording and/or reading information for preventing said rewriting |
JPS57140050A (en) * | 1981-02-23 | 1982-08-30 | Shinko Electric Co Ltd | Checking method for transmission data |
JPS57188159A (en) * | 1981-05-15 | 1982-11-19 | Nec Corp | Error check system |
-
1987
- 1987-07-30 JP JP62191196A patent/JPH0664842B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5797187A (en) * | 1980-10-13 | 1982-06-16 | Kopitetsukusu Gmbh Zuitsuhiaah | Method of preventing rewriting of information only recorded on data holder and apparatus for recording and/or reading information for preventing said rewriting |
JPS57140050A (en) * | 1981-02-23 | 1982-08-30 | Shinko Electric Co Ltd | Checking method for transmission data |
JPS57188159A (en) * | 1981-05-15 | 1982-11-19 | Nec Corp | Error check system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010058032A (en) * | 2008-09-03 | 2010-03-18 | Takushoo:Kk | Dust collector for sheet work |
Also Published As
Publication number | Publication date |
---|---|
JPH0664842B2 (en) | 1994-08-22 |
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