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621.391 --- Cryptography --- Data transmission systems --- Digital communications --- Image processing --- -Spread spectrum communications --- Communications, Spread spectrum --- Telecommunication --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Communications, Digital --- Digital transmission --- Pulse communication --- Digital electronics --- Pulse techniques (Electronics) --- Digital media --- Signal processing --- Data communication systems --- Transmission of data --- Electronic data processing --- Electronic systems --- Information theory --- Telecommunication systems --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Signs and symbols --- Symbolism --- Writing --- Ciphers --- Data encryption (Computer science) --- 621.391 General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- Digital techniques --- Spread spectrum communications. --- Spread spectrum communications --- Digital image processing --- Cryptography. --- Digital communications. --- Data transmission systems. --- Digital techniques. --- Image processing - Digital techniques.