Encrypted data recovery method using split storage key and system thereof
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United States of America Patent
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Sep 12, 2000
Grant Date -
N/A
app pub date -
Mar 30, 1998
filing date -
Mar 31, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
When a secret is encrypted and stored, it is necessary to provide a countermeasure for the situation where a key is lost (key recovery system). In the present invention, a key recovery system for an enveloped data format in which a common key is used to encrypt a plaintext (secret) and a user's public key is used to encrypt the common key and attached to an encrypted text is provided. In the present invention, only the common key is decrypted to recover the secret without reconstruction of split secret keys kept in a plurality of key storage apparatuses.
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