PROCESS OF CRYPTOGRAPHIC CONVERSION OF BLOCKS OF DIGITAL DATA

FIELD: electric communication, computer engineering, cryptographic methods and devices to cipher digital data. SUBSTANCE: salient feature of process lies in breaking of data block into N 2 subblocks and in conversion of subblocks by one conversion operation as minimum by turns. This conversion depen...

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Hauptverfasser:	MOLDOVJAN A.A, MOLDOVJAN N.A
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY JAMMING OF COMMUNICATION PHYSICS SEALS SECRET COMMUNICATION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	FIELD: electric communication, computer engineering, cryptographic methods and devices to cipher digital data. SUBSTANCE: salient feature of process lies in breaking of data block into N 2 subblocks and in conversion of subblocks by one conversion operation as minimum by turns. This conversion depends on value of input block. Substitution operation realized with k bits of subblock, where 8 k 16 is used as operation depending on value of input block. Substitution operations are set by substitution table which number T 2. Secrete substitution tables are used as substitution tables. In addition binary vector V is formed and substitution table for implementation of substitution operation is chosen by value of vector V. Vector is formed on present step of conversion depending on its value on preceding step of conversion and on value of one of subblocks. EFFECT: increased cryptographic resistance. 2 cl, 3 dwg