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| The present invention involves apparatus and methods for providing video, audio, graphics, input/... |
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| Folded bag handle |
| I claim: 1. A handle-equipped bag comprising a carrying handle formed from a sheet of folded ... |
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| Method and apparatus for determining AM modulation factor |
| OF THE INVENTION As shown in FIG. 1, an AM signal (which is referenced to ground, as it will be ... |
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| Sampled differential analyzer |
| OF THE PREFERRED EMBODIMENTS FIG. 1 is a functional block diagram of the analyzer. The image ... |
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| Tube clarifier method for monitoring and/or controlling clarification processes |
| OF THE INVENTION The instant invention relates to a method for on-line monitoring and/or control ... |
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| Press-head |
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| Turret type punch press having a plurality of strikers |
| It is the object of the present invention to provide a new and improved turret type punch press ... |
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| Switched capacitor sine wave generator and keyer |
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| Automatic hand firearm |
| I claim: 1. An automatic hand firearm comprising a body including a handle, a barrel connected to ... |
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`Virtual` encryption scheme combining different encryption operators into compound-encryption mechanism
| Details |
Inventors: Leppek, James;
Assignee: Harris Corporation (Melbourne, FL)
Primary Examiner: Patel; Harshad
Assistant Examiner: Clark; Robin C.
Attorney, Agent or Firm: Wands; Charles E.
A `virtual` encryption scheme combines selected ones of plurality of different encryption operators stored in an encryption operator database into a compound sequence of encryption operators. Data to be transported from a data source site, such as a user workstation, to a data recipient site, such as another workstation, is sequentially encrypted by performing a compound sequential data flow through this sequence prior to transmission. Because of the use of successively different encryption operators, the final output of the sequence will be a compound-encrypted data stream that has no readily discernible encryption footprint. Therefore, even if a skilled data communications usurper possesses a decryption key for each encryption operators, there is a very low likelihood that he would be able to recognize the characteristics of any individual encryption operator. Moreover, without knowledge of the sequence of encryption operators a potential usurper will be forced to operate under a severe resource penalty that makes decryption of such a compound sequence a practical impossibility. At the recipient end of the data communications path, the recovery process involves the use of a complementary virtual decryption scheme that is the exact reverse of that used at the data source site. |
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DETAILED DESCRIPTION In accordance with the present invention, this problem is effectively remedied by a `virtual` encryption scheme that combines selected ones of plurality of different encryption operators stored in an encryption operator database into a compound sequence of encryption operators.
Data to be transported from a data source site, such as a user workstation, to a destination or data recipient site, is sequentially encrypted by performing a compound sequential data flow through this sequence prior to transmission.
By `virtual` encryption scheme is meant that the overall encryption operator itself does not actually perform any encrypting of the data.
Instead, it assembles selected ones of a plurality of true encryption mechanisms into a cascaded sequence of successively different encryption operators, each of which operates on the data, to realize a scrambled data stream that is not practically decryptable by a sophisticated data communications usurper.
For this purpose, a plurality of respectively different data encryption operators are stored in an encryption algorithm database, with each operator having an associated access address code through which the operator may be readily called up or accessed to operate on a data sequence of interest.
The fundamental mechanism of the virtual encryption scheme of the invention involves the generation of a sequence of the access codes, with immediately successive ones of the access codes of the sequence being different from one another.
This access code sequence is employed to call up or read out from the database selected ones of the respectively different data encryption operators so as to produce or assemble a sequence of data encryption operators.
Because immediately successive ones of the access codes of the access code sequence are different from one another, then their associated data encryption operators that have been assembled into the sequence of data encryption operators are also successively different from one another.
When the data is applied to the generated sequence of individual encrypting operators, what results is a scrambled data stream having no readily discernible encryption footprint that would imply what encryption mechanism has been used and facilitate decryption by a sophisticated data communications usurper
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Television 
