JPS6433773A - Data falsification checking system - Google Patents

Data falsification checking system

Info

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
Application number
JP19119687A
Other languages
Japanese (ja)
Other versions
JPH0664842B2 (en
Inventor
Tatsuji Unrinin
Takahiko Miyata
Kotaro Yamashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62191196A priority Critical patent/JPH0664842B2/en
Publication of JPS6433773A publication Critical patent/JPS6433773A/en
Publication of JPH0664842B2 publication Critical patent/JPH0664842B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62191196A 1987-07-30 1987-07-30 Data tampering check method Expired - Lifetime JPH0664842B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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