GB1239027A - - Google Patents

Info

Publication number
GB1239027A
GB1239027A GB1239027DA GB1239027A GB 1239027 A GB1239027 A GB 1239027A GB 1239027D A GB1239027D A GB 1239027DA GB 1239027 A GB1239027 A GB 1239027A
Authority
GB
United Kingdom
Prior art keywords
apertures
card
blank
cards
coding
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.)
Expired
Application number
Other languages
English (en)
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 filed Critical
Publication of GB1239027A publication Critical patent/GB1239027A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C1/00—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
    • G09C1/04—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system with sign carriers or indicators moved relative to one another to positions determined by a permutation code, or key, so as to indicate the appropriate corresponding clear or ciphered text

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Packages (AREA)
GB1239027D 1968-08-21 1968-08-21 Expired GB1239027A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3992868 1968-08-21

Publications (1)

Publication Number Publication Date
GB1239027A true GB1239027A (enrdf_load_stackoverflow) 1971-07-14

Family

ID=10412256

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1239027D Expired GB1239027A (enrdf_load_stackoverflow) 1968-08-21 1968-08-21

Country Status (1)

Country Link
GB (1) GB1239027A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196529A (en) * 1978-08-02 1980-04-08 Follett Publishing Company Teaching device and method
US5056142A (en) * 1988-11-30 1991-10-08 Jacques Lapointe Decryption device
GB2261540A (en) * 1991-09-23 1993-05-19 Wouter Goede Memory aiding device
DE4420689A1 (de) * 1994-06-14 1995-12-21 Franz Brunner Verfahren zum Codieren von persönlichen Identifikations-Nummern (PIN) und sonstigen Geheimziffern
GB2429576A (en) * 2005-08-25 2007-02-28 Jonathan Geoffrey Milt Craymer Secure data storage device.
WO2007041816A3 (en) * 2005-10-10 2007-10-18 Luis Henrique Duraes Silva Combination system of variable passwords

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196529A (en) * 1978-08-02 1980-04-08 Follett Publishing Company Teaching device and method
US5056142A (en) * 1988-11-30 1991-10-08 Jacques Lapointe Decryption device
GB2261540A (en) * 1991-09-23 1993-05-19 Wouter Goede Memory aiding device
GB2261540B (en) * 1991-09-23 1995-12-06 Wouter Goede Memory aiding device
DE4420689A1 (de) * 1994-06-14 1995-12-21 Franz Brunner Verfahren zum Codieren von persönlichen Identifikations-Nummern (PIN) und sonstigen Geheimziffern
GB2429576A (en) * 2005-08-25 2007-02-28 Jonathan Geoffrey Milt Craymer Secure data storage device.
WO2007041816A3 (en) * 2005-10-10 2007-10-18 Luis Henrique Duraes Silva Combination system of variable passwords

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees