KEY MANAGEMENT METHOD AND ITS SYSTEM

PROBLEM TO BE SOLVED: To provide a system such that each key storage agent keeps a correct partial key from the user and that parties other than the user cannot know the secret key. SOLUTION: A user 11i shares a partial key Sij with a plurality of key storage agent 12j(j=1, 2, 3). This sharing is co...

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Bibliographic Details
Main Authors KANDA MASASUKI, TANAKA KIYOTO, KURODA IKUKO
Format Patent
LanguageEnglish
Published 30.07.1999
Edition6
Subjects
ADVERTISING
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
SEALS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To provide a system such that each key storage agent keeps a correct partial key from the user and that parties other than the user cannot know the secret key. SOLUTION: A user 11i shares a partial key Sij with a plurality of key storage agent 12j(j=1, 2, 3). This sharing is conducted cooperatively by both parties according to a common key delivery method. The user 11I sums partial keys Sij to obtain a secret key Si, an agent 12j stores the partial key Sij for each user (i) and encrypts the key Sij with a system open information (g), and the result is sent to a key registration agent 13. The agent 13 multiplies the encrypted partial keys to obtain an open key Pi of the user (i) by encrypting the Si with the (g), and the open key Pi is registered for each user (i) and open to public.
Bibliography:Application Number: JP19980008661