Abstract: “System-on-Chip applications have been widen to various public, private, government and social communication systems for handling security and trust as a systems for mission critical and e-government. Most mission critical and embedded real time applications run on System -on -Chip. SoCs will have limited resources, processing ability and rigid power constraints therefore, SoCs becomes a holdup when it comes to handling the complex and large footprint software [3]. saRTL is standalone Real Time Linux operating system with small footprint and having hard real time features. The bare kernel of saRTL is approximately 200KB only. Therefore using saRTL is a better option for SoC based applications. miniDES is a symmetric key encryption algorithm with very small footprint. Approximately, the size of algorithm is 3KB only and it has the power and elegance of Data Encryption Standard lgorithm (DES). Since, SoCs used in critical and Real Time embedded applications, security has to be enforced in”

Keywords: Digital Signature, miniDES, standalone Real Time Linux, System -on-Chip, TCP/IP