Increasing the Reliability of Determining the Source of Fragmented Messages by Using Methods for Analyzing the Time of Receipt of Individual Fragments

Purpose of research. The article discusses a method for increasing the reliability of authentication of data sources in distributed information systems using communication channels with low bandwidth. Such systems are characterized by a small size of authentication codes contained in individual messages, which leads to a significant frequency of authentication errors.

Methods. The article presents an algorithm for correcting authentication errors performed for chains of information blocks. Due to the analysis of the time of receipt of blocks to the receiver, a numerical metric is formed for each message chain, which is recognized by the receiver as a chain formed by the target source. The chain is selected based on the minimum value of the calculated metric.

Results. Based on the real time characteristics of network packet delivery, a simulation model was created for the formation and verification of metrics generated for message chains. It is shown that, depending on the value of the simulated parameters of network packet transmission, the use of the proposed universal metric allows with a probability of up to 80% to choose from two chains identified by the receiver as a chain of blocks of the target source the one that is actually formed by it.

Conclusion. The paper shows that the use of an algorithm for analyzing meta-information - the time of receiving a data packet - can be used as a means of increasing the reliability of the authentication procedure performed for a remote subject of information exchange in conditions when the use of conventional cryptographic algorithms does not provide the required reliability. The proposed algorithm has low computational complexity, is easily implemented in hardware and reduces the number of errors when processing information data packets.

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