WO1996015604B1 - Message protection system and method - Google Patents

Message protection system and method

Info

Publication number
WO1996015604B1
WO1996015604B1 PCT/US1995/012403 US9512403W WO9615604B1 WO 1996015604 B1 WO1996015604 B1 WO 1996015604B1 US 9512403 W US9512403 W US 9512403W WO 9615604 B1 WO9615604 B1 WO 9615604B1
Authority
WO
WIPO (PCT)
Prior art keywords
elements
array
mask
encryption
information
Prior art date
Application number
PCT/US1995/012403
Other languages
French (fr)
Other versions
WO1996015604A1 (en
Filing date
Publication date
Priority claimed from US08/336,766 external-priority patent/US5717760A/en
Application filed filed Critical
Priority to EP95936202A priority Critical patent/EP0795240A4/en
Priority to JP8516035A priority patent/JPH10508955A/en
Publication of WO1996015604A1 publication Critical patent/WO1996015604A1/en
Publication of WO1996015604B1 publication Critical patent/WO1996015604B1/en

Links

Abstract

An encryption/decryption apparatus that provides at least two masks (48, 54), each of which is used in logic/mathematic operation with information to be encrypted to preserve confidentiality. The operations include exclusive oring (114), addition (110), subtraction (112). The source of the masks can be any commonly found data, for example, the code of a music CD. In such a manner the sender may tell the receiver in private that the masks are from a particular track on a particular CD, sampled in a particular fashion, using a particular password (23). The product of the number of elements in each mask need not be greater or equal to the number of elements in the data file being encrypted. Repetition may make the decoding easier for an eavesdropper, but the use of a password character array (126) to control the use and sequencing of each set of encoding mask receptions greatly helps in maintaining the confidentiality of the data. The present invention includes use as a one-time pad and can be implemented on personal computers.

Claims

AMENDED CLAIMS
[received by the International Bureau on 3 May 1996 (03.05.96); original claims 1-54 replaced by new claims 1-54 (2 pages)]
1 . Encryption and decryption apparatus comprising: means for retrieving information to be encoded, said information defining an array D of elements, a first mask array of elements M1 and a second mask a r r a y o f e l e m e n t s M 2 , a password array of P elements, wherein the P elements are arranged to provide information for directing and controlling said encryption processing, an encoder that encodes the array of elements D in accordance with said password information, where the means for encoding includes means for performing a first operation of the elements D and the elements M1 , forming an intermediate array of elements R, and where the encoder performs a second operation on the elements R using the elements M2 whose results form a n e n c o d e d m e s s a g e , means for accessing the encoded message, and a decoder that recreates the original message from the encoded message in accordance with said password information, where the decoder performs the logical inverse of the encoder to recreate the original message.
2. Encryption apparatus as defined in claim 1 where the first operation is an "exclusive oring" and the second operation is "adding" and where the corresponding logical inverse of "adding" is "subtracting" and the corresponding logical inverse of "exclusive oring" is "exclusive oring."
3. Encryption apparatus as defined in claim 1 where the first operation is an "adding" and the second operation is "exclusive oring", and where the corresponding logical
6 6 elements of the first mask array and the second counter output selects the elements of the second mask array.
24. Apparatus as defined in claim 1 further comprising at least a first and a second address register, each said register output forming the address to select the elements of the first mask array and the second address register forming the address to select the elements of the second mask array, and means to load and increment said registers such that the output of each register forms a nonlinear sequence.
25. Apparatus as defined in claim 24 comprising: a set of constants, other counters, in any order that are used to modify the contents of the address registers at different times such that the address register output forms a nonlinear sequence.
26. Apparatus as defined in claim 1 further comprising one or more additional mask arrays wherein each additional array contents is used by the means for encoding to modify the result of the operation with the preceding mask array.
27. Encryption as defined in claim 1 where each of the masking arrays both reside as elements of a single array.
28. A method for encrypting and decrypting messages c o m p r i s i n g t h e s t e p s o f : retrieving an array D of elements to be encoded, defining a mask array of elements M , creating a password array of P elements, wherein the P elements are arranged to provide encryption processing information,
6 7
PCT/US1995/012403 1994-11-09 1995-09-29 Message protection system and method WO1996015604A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95936202A EP0795240A4 (en) 1994-11-09 1995-09-29 Message protection system and method
JP8516035A JPH10508955A (en) 1994-11-09 1995-09-29 Information security system and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/336,766 US5717760A (en) 1994-11-09 1994-11-09 Message protection system and method
US08/336,766 1994-11-09

Publications (2)

Publication Number Publication Date
WO1996015604A1 WO1996015604A1 (en) 1996-05-23
WO1996015604B1 true WO1996015604B1 (en) 1996-07-04

Family

ID=23317561

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/012403 WO1996015604A1 (en) 1994-11-09 1995-09-29 Message protection system and method

Country Status (5)

Country Link
US (1) US5717760A (en)
EP (1) EP0795240A4 (en)
JP (1) JPH10508955A (en)
CA (1) CA2204878A1 (en)
WO (1) WO1996015604A1 (en)

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