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| Expansion circuit for improved stereo and apparent monaural image |
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| Video disc encoding and decoding system providing intra-field track error correction |
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| Desk/wall mounted telephone subset |
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| Source data compression and decompression in code symbol printing and decoding |
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Data communications system using public key cryptography in a web environment
| Details |
Inventors: Holloway, Christopher James;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Barron, Jr.; Gilberto
Assistant Examiner:
Attorney, Agent or Firm: Ray-Yarletts; Jeanine S.
Described is a communications system in which messages may be processed using public key cryptography with a private key (SKu) unique to one or more users (150). The system comprises a server means (130) adapted for data communication with a client (110) via a network (100), the server means (130) comprising first data storage means in which is stored in a secure manner a private key for the or each user, the private key being encrypted with a key encrypting key. The server means further comprises second data storage means in which is stored applet code executable on the client. The server provides the applet code to the client via the network in response to connection of the client to the server via the network. The applet code comprises secure processing means operable, when executed in the client, to receive a message to be processed from the user, to retrieve the encrypted private key for the user from the server means via the network, to receive the key encrypting key from the user, to decrypt the private key using the key encrypting key, and to perform the public key processing for the message using the decrypted private key. The applet code and the associated keys are removed from the client on termination of the applet code. |
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DETAILED DESCRIPTION To solve this problem, in accordance with the present invention there is now provided a communications system for processing messages using public key cryptography with a private key unique to one or more users, the system comprising: server means adapted for data communication with a client via a network, the server means comprising first data storage means for storing in a secure manner a private key for the or each user, the private key being encrypted with a key encrypting key; characterised in that the server means further comprises second data storage means in which is stored applet code executable on the client, the server providing the applet code to the client via the network in response to connection of the client to the server via the network; the applet code comprising secure processing means operable, when executed in the client, to receive a message to be processed from the user, to retrieve the encrypted private key for the user from the server means via the network, to receive the key encrypting key from the or each user, to decrypt the private key using the key encrypting key, and to perform the cryptographic key processing for the message using the decrypted private key; the applet code and the associated keys being removed from the client on termination of the applet code.
Preferably, the secure processing means is operable, when executed in the client during initial registration of a registering user, to generate the private key and an associated public key, to receive a key encrypting key from the registering user, to encrypt the private key using the key encrypting key received from the registering user, and to send the encrypted private key and public key from the client to the server means for storage in the first data storage means.
In preferred embodiments of the present invention, the server means comprises a key server for storing the encrypted private key, a web server connected to the network, and a fire-wall connecting the web server to the key server, the key server supplying the private key to the client via the web server
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Audio Signal Processing 
