Encrypted data recovery method using split storage key and syste

Details Encrypted data recovery method using split storage key and syste Encrypted data recovery method using split storage key and syste

1998-03-30

2000-09-12

Swann, Tod R.

Cryptography

Key management

Key distribution

380 46, 380286, 713156, H04L 908, H04L 932

Patent

active

061188743

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.

REFERENCES:
patent: 5276737 (1994-01-01), Micali
patent: 5315658 (1994-05-01), Micali
patent: 5883956 (1999-03-01), Le et al.
patent: 5917911 (1999-06-01), Dabbish et al.
Denning, D., "Key Escrowing Today," IEEE Communications Magazine, vol. 32, No. 9, Sep. 1994, pp. 58-68.
"Fair Cryptosystems", MIT/LCS/TR-579,C,MA, Published Aug.11, 1994.

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