94A05 Communication theory [See also 60G35, 90B18]
94A08 Image processing (compression, reconstruction, etc.) [See also 68U10]
94A11 Application of orthogonal functions in communication 
94A12 Signal theory (characterization, reconstruction, etc.)
94A13 Detection theory 
94A14 Modulation and demodulation 
94A15 Information theory, general [See also 62B10]
94A17 Measures of information, entropy 
94A20 Sampling theory 
94A24 Coding theorems (Shannon theory)
94A29 Source coding [See also 68P30]
94A34 Rate-distortion theory 
94A40 Channel models 
94A45 Prefix, length-variable, comma-free codes [See also 20M35, 68Q45]
94A50 Theory of questionnaires
94A55 Shift register sequences and sequences over finite alphabets
94A60 Cryptography [See also 11T71, 14G50, 68P25]
94A62 Authentication and secret sharing
94A99 None of the above, but in this section