CIPHER KEY MANAGING METHOD AND APPARATUS

PURPOSE: To obtain a cryptographic key managing method excellent in security protection of a cipher by inspecting the first and second fields of a candidate control vector so as to allow the restoration of the cryptographic key only when the execution of a ciphering function is permitted. CONSTITUTI...

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Bibliographische Detailangaben
Hauptverfasser:	SUTEIBUN EMU MACHIYUUZU, DONARUDO BIII JIYONSON, RAMETSUSHIYU KEI KAAN, AN BUI RI, DENIIIZU JIII ABURAHAMU, ROSUTEISUROO PURAIMATSUKU, JIYON DEII UIRUKINZU, PATORITSUKU JIEI MAKUKOOMATSUKU
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING CALCULATING CHECKING-DEVICES CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY COMPUTING COUNTING CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY FARE-REGISTERING APPARATUS FRANKING APPARATUS PHYSICS SEALS TICKET-ISSUING APPARATUS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	PURPOSE: To obtain a cryptographic key managing method excellent in security protection of a cipher by inspecting the first and second fields of a candidate control vector so as to allow the restoration of the cryptographic key only when the execution of a ciphering function is permitted. CONSTITUTION: A first control vector inspecting means receives the first part of a related control vector, judges whether the execution of the ciphering function is permitted by using the cryptographic key and outputs a first permission signal. A second control vector inspecting means receives the second part of the related control vector, judges whether the execution of the ciphering function is permitted by using the cryptographic key and outputs a second permission signal. A cipher processing means starts the execution of the ciphering function by using cryptographic key in response to the first and second permission signals. Thereby a managing means excellent in the security protection and the maintainability of ciphers.