Document Management Cryptography
OwnerGideon Samidinventor
Life of this patent
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Abstract
Using composite cipher technology a single ciphertext C will decrypt to plaintext Pi using key Ki, and to plaintext Pj≠Pi using key Kj≠Ki, thereby a single file C will carry any number of distinct messages so that each key holder will see in C the message intended for them. Applicable for complex project management where frequent changes and large number of people are involved. Also in email systems where a single email will deliver a shared message plus individual messages to selected readers.
Claims9
A document management cryptography system called DMC supporting a multi-party project, serving to manage knowledge distribution to all relevant parties where parties are each limited to their sphere of project knowledge, and no further, by consolidating project documentation D to a single master file, P, updated as necessary, wherein P is encrypted to a corresponding composite ciphertext C, then C is distributed to the parties such that each party extracts from C only the information it is authorized to see, and no more;
- thereby eliminating the need for many project documents adapted to each party based on their information exposure credentials, and since it is a burden to timely update these many project documents, having one master file P serving all relevant parties is a distinct functional advantage;
- so doing by
- using a composite cipher, CC, which generates the composite ciphertext C corresponding to the plain version of the project master file, P, and that decrypts to an arbitrary number p of plaintexts P1, P2, . . ., Pp, by decrypting C with respective cryptographic keys:
- K1, K2, . . ., Kp, such that Pi=Decrypt(C, Ki), for i=1,2, . . .p,
- a party in possession of k of the p keys will extract from C the plaintexts corresponding to these k keys, and no more.
Dependencies are inferred from the claim text.