Cryptography – Key management – Having particular key generator
Reexamination Certificate
2007-02-13
2007-02-13
Song, Hosuk (Department: 2135)
Cryptography
Key management
Having particular key generator
C380S277000, C713S189000, C713S192000, C713S193000
Reexamination Certificate
active
10618177
ABSTRACT:
The invention provides a device, used in a communication apparatus including a cipher-key generating module, for securing a subscriber's information. The device includes a storage module, a cipher-key acquiring module, an encrypting module and a decrypting module. The subscriber's information is stored in the storage module. The cipher-key acquiring module transmits an input to the cipher-key generating module, and then receives a cipher key generated by the cipher-key generating module in response to the input. The encrypting module retrieves the cipher key through the cipher-key acquiring module, retrieves the subscriber's information from the storage module, and encrypts the subscriber's information using the cipher key to generate an encrypted information. After generated, the encrypted information is stored into the storage module and replaces the subscriber's information. When the subscriber's information needs to be used, the decrypting module retrieves the cipher key through the cipher-key acquiring module, retrieves the encrypted information, and decrypts the encrypted information using the cipher key to recover the subscriber's information. When the decrypting module retrieves the cipher key through the cipher-key acquiring module, the cipher-key acquiring module transmits the input once more to the cipher-key generating module, and then receives the cipher key generated once more by the cipher-key generating module in response to the input.
REFERENCES:
patent: 4941176 (1990-07-01), Matyas et al.
patent: 5481613 (1996-01-01), Ford et al.
patent: 5623546 (1997-04-01), Hardy et al.
patent: 2001-309433 (2001-02-01), None
Abstract of JP2001309433 A, Patent Abstracts of Japan, available at esp@cenet database.
Ben-Chuan Du
Chen-Huang Fan
Benq Corporation
Birch & Stewart Kolasch & Birch, LLP
Song Hosuk
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