 The Next Generation Modernization Plan for Automatic Dependent Surveillance Broadcast, ADSB, systems involves the use of Format Preserving, F, Feistel-based Encryption, F, with multiple implementation variances, X, FFX, algorithms to enhance security. This paper assesses the feasibility of these algorithms for enhancing ADSB's security by evaluating their performance metrics such as message entropy, correlation, and serial correlation. The authors also conducted flight tests to demonstrate the effectiveness of the proposed method. The results show that the proposed scheme is achievable, compatible, and efficient for the avionics industry. This article was authored by Jamal Habibi Markani, Abdesimad Amarhar, Jean-Marc Gagny, and others.