> 94-XX Information and communication, circuits > 94AXX Communication, information

94A05 Communication theory	94A08 Image processing (compression, reconstruction, etc.)	94A11 Application of orthogonal functions in communication
94A12 Signal theory (characterization, reconstruction, etc.)	94A13 Detection theory	94A14 Modulation and demodulation
94A15 Information theory, general	94A17 Measures of information, entropy	94A20 Sampling theory
94A24 Coding theorems (Shannon theory)	94A29 Source coding	94A34 Rate-distortion theory
94A40 Channel models	94A45 Prefix, length-variable, comma-free codes	94A50 Theory of questionnaires
94A55 Shift register sequences and sequences over finite alphabets	94A60 Cryptography	94A62 Authentication and secret sharing
94A99 None of the above, but in this section

94AXX Communication, information