JPS57142057A - Mail box communication system - Google Patents

Mail box communication system

Info

Publication number
JPS57142057A
JPS57142057A JP56026954A JP2695481A JPS57142057A JP S57142057 A JPS57142057 A JP S57142057A JP 56026954 A JP56026954 A JP 56026954A JP 2695481 A JP2695481 A JP 2695481A JP S57142057 A JPS57142057 A JP S57142057A
Authority
JP
Japan
Prior art keywords
terminal
reception
information
exchanger
transmits
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.)
Pending
Application number
JP56026954A
Other languages
Japanese (ja)
Inventor
Hiroshi Kanai
Toshiaki Toyama
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 JP56026954A priority Critical patent/JPS57142057A/en
Publication of JPS57142057A publication Critical patent/JPS57142057A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/22—Arrangements for preventing the taking of data from a data transmission channel without authorisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

PURPOSE:To prevent the leakage of confidential information for data communication and facsimile communication, by providing a logical terminal number being a specific address designation in a start signal to a reception terminal. CONSTITUTION:A transmission terminal transmits the information given to a reception terminal and the required information such as opposing terminal designation and the like to an exchanger 10, and a logical terminal signal making address designation is provided in the required information. The exchanger 10 stores the information from the transmission terminal once, makes a reception terminal start signal SOM from the information and transmits it to the reception terminal. The reception terminal detects that the logical terminal signal is included and transmits a negative response NACK indicating that the reception preparation is not ready to the exchanger 10. The exchanger 10 transmits the SOM again, the reception station inputs the pass word of an addressed person, and if this is coincident with the logical terminal signal, an affirmative signal ACK is returned. Thus, the information stored in the exchanger is transmitted to the reception terminal.
JP56026954A 1981-02-27 1981-02-27 Mail box communication system Pending JPS57142057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56026954A JPS57142057A (en) 1981-02-27 1981-02-27 Mail box communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56026954A JPS57142057A (en) 1981-02-27 1981-02-27 Mail box communication system

Publications (1)

Publication Number Publication Date
JPS57142057A true JPS57142057A (en) 1982-09-02

Family

ID=12207542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56026954A Pending JPS57142057A (en) 1981-02-27 1981-02-27 Mail box communication system

Country Status (1)

Country Link
JP (1) JPS57142057A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733680A1 (en) * 1986-10-06 1988-04-14 Canon Kk Message transmission system
JPH0250650A (en) * 1988-08-12 1990-02-20 Canon Inc Facsimile equipment
EP0375139A2 (en) * 1988-12-22 1990-06-27 International Business Machines Corporation Classified document transmission control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733680A1 (en) * 1986-10-06 1988-04-14 Canon Kk Message transmission system
DE3733680C2 (en) * 1986-10-06 1999-11-04 Canon Kk Central unit for a messaging system
JPH0250650A (en) * 1988-08-12 1990-02-20 Canon Inc Facsimile equipment
EP0375139A2 (en) * 1988-12-22 1990-06-27 International Business Machines Corporation Classified document transmission control

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