Context-Aware Dynamic RSA Key Sizing for Secure, Low-Latency 5G Communications

Abstract

The frenzied growth of 5G networks has brought about a heterogeneous range of use cases, from improved mobile broadband (eMBB) to ultra-reliable low-latency communications (URLLC) and massive machine-type communications (mMTC). Every of these areas brings unique requirements in terms of latency, device constraints, and security and thus exposes the limitations of traditional cryptographic techniques like fixed- size RSA. Conventional RSA, with its fixed key size, tends to find it difficult to achieve an optimal compromise among security strength, latency sensitivity, and energy consumption in the very variable environment of today’s 5G networks.As an answer to these demands, this paper proposes a context-aware RSA implementation that adaptively adjusts RSA key sizes in real time. This adaptive control considers an extensive array of factors—such as channel quality, device processing power, battery level, and the current security threats—to guide cryp- tographic parameter setting. The system developed in this way is optimized for security while also reducing latency and energy expenditure, thereby synchronizing cryptographic performance with the operating context.Through both simulation studies and theoretical analyses, the framework proposed is shown to incur notable improvements in terms of energy efficiency and latency minimization compared to conventional, static RSA implementa- tions. Notably, these are accomplished without a trade-off and, in certain instances, an improvement in overall security. The context-aware RSA paradigm, therefore, proves to be a versatile and scalable cryptographic mechanism specifically suited for 5G networks’ heterogeneous and dynamic nature. This work thereby establishes a basis for more effective and robust security designs in the changing wireless environment.