Whereas cryptography is the practice of protecting the contents of a message alone, steganography is concerned with concealing the fact that a secret message is being sent as well as concealing the contents of the message. Media files are ideal for steganographic transmission because of their large size. In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. the process of hiding secret messages inside some multimedia files (like photo, audio or video file), which usually contain unused or irrelevant data spaces filled by terrorists’ secret information, using different steganographic techniques. Wikipedia defines steganography as “the practice of concealing a file, message, image, or video within another file, message, image, or video.” It represents the “hidden writing” ie.
Space synthetic biology emerging as key technology for Space Exploration and deep space manned missions. DARPA B-SURE developing Biomanufacturing in Space for DoD orbital and lunar missions. DARPA SBIR for 3D printing of safe and edible food products converted from waste. DOD developing hardened Military GPS receivers or User Equipment (MGUE) to mitigate the threat of GPS Jamming and Navigation Warfare. 
US launches 5G Military strategy and declares 5G competition as a “New arms race.”. 
DARPA SDCPS & JARVIS developing AI assisted design of Military Cyber Physical Systems. Europe and US launch Quantum testbeds and Quantum loop to catchup China in Quantum Communications Race. Vertical-cavity surface-emitting lasers (VCSEL& VECSEL) arrays enable data communication to lidar and military infrared imaging. Materials for nonlinear integrated photonics. Nonlinear photonics or optics key enabling technology for imaging, high-speed data communication and optical computing. Silicon Waveguides critical element of silicon photonics in communications, interconnects, and biosensors. 
Microsatellite and Nanosatellite constellations require new micro propulsion technologies for autonomous civil and military missions. Electric Propulsion based on Iodine Fuel will enable Moon and other near Earth objects missions to deorbiting, rendezvous, and satellite maintenance mission. Dynamic metasurfaces including Liquid crystal metasurfaces allow tuning of metasurface functionality also after fabrication. Quantum computer threat on digital infrastructure requires Quantum proof cryptography, NIST standardizing post-quantum cryptographic algorithms. AI enabled Intelligent Satellite Networks. Quantum cryptography (QC) or Quantum key distribution (QKD) are assumed hackproof but its implementations have vulnerabilities. DARPA CCU developing AI enabled automated cultural interpreters and dialogue assistants. Wireless power for drones and drone swarms.
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