A New Secure Encryption Algorithm Based on RC4 Cipher and 4D Hyperchaotic Sprott-S System

The widespread exchange of data in various formulas such as text and images via multimedia has created a great need for encryption techniques development, that can protect sharing of important secure data from untrusted or unauthorized access. In this paper, a two-level encryption method is proposed, the first level involves the use of an RC4 algorithm with several different length keys. The number of used keys depends on the length of the input original text. The keys are extracted from a 4D hyperchaotic Sprott_S system. The first encryption process is followed by the second encryption using the XOR gate for the first encryption output, with another key chain extracted from the same hyperchaotic system, that is pre-processed differently. Several measurements were used to measure the efficiency of the algorithm, including the time of application of the algorithm, histogram, bit error rate, and correlation. The experiments that were conducted on texts of different sizes showed the efficiency of the algorithm's performance, its high level of security, and the lack of time it needs, which confirms its quality.