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| Personal object detector with enhanced stereo imaging capability |
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| Cryptosystem |
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| Recognition procedure and an apparatus for carrying out the recognition procedure |
| We claim: 1. A recognition procedure including the steps of teaching a reference pattern to a ... |
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| Apparatus for discriminating information signals from noise signals in a communication signal |
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| Method and apparatus for sending secure datagram multicasts |
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| Mounting arrangement for a position locating system |
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| Amplifier device for a condenser microphone |
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| Multichannel matrix logic and encoding systems |
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Cryptographic key, or other secret material, recovery
| Details |
Inventors: Arthan, Robin Denis;
Assignee: Fujitsu Services Limited (Slough, GB)
Primary Examiner: Smithers; Matthew
Assistant Examiner: Tran; Tongoc
Attorney, Agent or Firm: Barnes & Thornburg LLP
Secret material, such as a cryptographic key, that is needed for operation of a computer system (4a), can be stored under password protection on a storage medium for insertion into the computer system as required. If the password is forgotten, or the storage medium is faulty, the secret material will not be accessible. To permit secure recovery of the secret material in these or other circumstances, the secret material is encrypted using a recovery key and stored on the computer system, together with a value used in the generation of the recovery key from the secret material. The secret material is also stored on a remote secure system (5). When recovery of the secret material is required, the value for generating the recovery key is supplied to the remote system and used to generate the recovery key there. The generated recovery key is then supplied to the computer system, where it is used to decrypt the secret material. A new recovery key is then generated using a different value for a future recovery instance. The value can be supplied to the remote system (5) by dictation of a corresponding alphanumeric expression by a computer system operator (6), over a telephone connection (7, 8, 9) to a support technician (10) at the remote system for input thereat, and another alphanumeric expression corresponding to the generated recovery key can be dictated back to the computer system operator for insertion into the computer system and subsequent decryption of the secret material, thus allowing operation of the computer system, in circumstances where there is no data connection link between the two systems. |
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DETAILED DESCRIPTION According to the present invention there is provided a method permitting secure storage and secure recovery of secret information at a first location, comprising the steps of generating a recovery key from the secret information using a recovery key generation value, encrypting the secret information using the recovery key, storing the recovery key generation value and the encrypted secret information at the first location, and storing the secret information at a second location, and wherein when recovery of the secret information is required at the first location performing the steps of supplying the recovery key generation value from the first location to the second location, generating the recovery key from the secret information stored at the second location using the supplied recovery key generation value, supplying the recovery key generated at the second location to the first location, and, at the first location, decrypting the encrypted secret information using the supplied recovery key.
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Audio Signal Processing 
