AMBIGUITY INCREASE Russian patent published in 2020 - IPC H04L9/06 H04L9/08 H04L9/14 

FIELD: safe data transmission.

SUBSTANCE: method includes: performing a number of operations affecting the message conversion, resulting in higher uncertainty (Conditional entropy) of the HE(M) message; when an intruder (cracker) performs a full brute force attack on a third encrypted text, said operation, including both XOR encryption and subsequent conversion with fixed-period encryption, receives combined first and second encrypted texts as input data and creates third encrypted text as output data, using third and fourth keys obtained from second entropy pool; performing an operation for increasing the Key Conditional entropy after each encryption cycle, in which it is said that operation results in increase of key conditional entropy HE(K) after performance of full brute force attack on third coded text.

EFFECT: technical result is providing a security system which is robust to full busting with any possible encryption, despite using a key of finite length.

10 cl, 7 dwg