This book presents a selection of the papers presented at EUROCODE '90, the symposium on coding theory held in Udine, Italy, November 1990. The book is divided into eight sections: - Algebraic codes - Combinatorial codes - Geometric codes - Protection of information - Convolutional codes - Information theory - Modulation - Applications of coding.

Concatenated spherical codes codes sphériques concaténés.- A note on automorphism groups of codes and symbol error probability computation.- A direct proof for the automorphism group of reed solomon codes.- A family of binary codes with asymptotically good distance distribution.- A transformation on boolean functions, its consequences on some problems related to reed-muller codes.- Covering radius of RM(1,9) in RM(3,9).- The weights of the duals of binary bch codes of designed distance ?=9.- The minimum distance of some binary codes via the newton's identities.- Minimum-change binary block-codes which are well balanced.- Construction of unequal error protection codes.- Unidirectional error detecting codes.- Coherent partitions and codes.- $$\frac{1}{\lambda }$$ -regular and $$\frac{1}{\lambda }$$ -homogeneous tournaments.- Decoding of codes on hyperelliptic curves.- Decoding of codes on the klein quartic.- Asymptotically good families of geometric goppa codes and the gilbert-varshamov bound.- Multiplicative character sums and non linear geometric codes.- A survey of identification schemes.- A correlation cryptographic scheme.- Pseudorandom permutations based on the D.E.S. scheme.- Linear complexity of transformed sequences.- Some remarks on a LFSR “disturbed” by other sequences.- Parameters for complex FFTs in finite residue class rings.- A cryptographic tool for programs protection.- Decoding techniques for convolutional codes.- A weighted-output variant of the viterbi algorithm for concatenated schemes using a convolutional inner code / Une Variante À Sortie Pondérée De L'Algorithme De Viterbi Pour Des Schémas Concaténés À Code Intérieur Convolutif.- Coded modulation with convolutional codes over rings.- A shannon-theoretic coding theorem in authentication theory.- Joint fractional entropy.- On the adaptive source coding / Sur Le Codage De Source Adaptatif.- Minimum codeword length and redundancy of Huffman codes.- Binary covering codes and high speed data transmission.- Coding and modulation for the gaussian channel, in the absence or in the presence of fluctuations / Codage Et Modulation Pour Le Canal Gaussien, Sans Ou Avec Fluctuations.- Comparison of two modulation-coding schemes for low-rate digital land mobile radiocommunication.- Chernoff bound of trellis coded modulation over correlated rayleigh channel.- A hybrid FEC-ARQ communication system using sequential decoding.- A 30 Mbits/s (255,223) reed-solomon decoder.