‎MOREL FIONA, BUSHNELL GRAHAM, GIBBS-GOODEY DIANA‎
‎CHANNEL 3‎

‎The Wire-Tap Channel. - [PERFECT SECRECY - FIRST DESCRIPTION OF THE WIRE-TAP CHANNEL.]‎

‎New York, American Telephone and Telegraph Company, 1975. 8vo. Original full green cloth, bound with the original blue wrappers. Volume 54, 1975 of ""The Bell System Technical Journal"". Library stamp to pasted down front free end-paper. Minor bumping to extremities. Beside a very few pencil marks a nice and clean copy. Pp. 1355-1387. [Entire issue: Pp. 1179-1796 + 4 wrappers].‎

‎First edition of Wyner's highly influential paper on the wire-tap channel. In the paper, Wyner shows how one could obtain ""perfect secrecy"" when a receiver enjoys a better channel than does the wire-tapping opponent.""Aaron's interest in cryptography led him to invent the wire-tap channel.'' In his 1975 BSTJ paper introducing this channel, he worked out virtually its complete theory, showing the then-surprising fact that one could obtain perfect secrecy without the advance exchange of secret keys provided that the legitimate receiver enjoys a better channel from the sender than does the wire-tapping opponent. This work, which preceded the introduction of public-key cryptography, has had a steadily increasing influence on developments in this field. Recent results by Maurer and by Csiszar and Korner showing the remarkable usefulness of common randomness'' in cryptography are direct consequences of Wyner's work."" (From the ITSOC obituary).Aaron D. Wyner is also known for his contributions in coding theory, particularly the Gaussian channel and cryptography. ‎

‎Insight Pocket guide singapore Discovery Channel‎

‎Channel 4 Sans date. Insight Pocket Guide: Singapore/ Discovery Channel . Insight Pocket Guide: Singapore/ Discovery Channel‎

‎Très bon état‎

‎Parish Church of st Brelade and the Fishermen's chapel Jersey Channel Islands‎

‎Channel 4 Sans date. Parish Church of St. Brelade and the Fishermen's Chapel/ Jersey Channel Islands . Parish Church of St. Brelade and the Fishermen's Chapel/ Jersey Channel Islands‎

‎Très bon état‎

‎Probability Error for Optimal Codes in a Gaussian Channel.‎

‎(New York), American Telephone and Telegraph Compagny, 1959. 8vo. In the original blue printed wrappers. In ""The Bell System Technical Journal"", Volume 38, Number 3, pp. Light miscolouring to spine, otherwise a very fine, clean and fresh copy. Pp. 611-656. [Entire volume: Pp. 611-907].‎

‎First printing of Shannon's important 1959-paper in which he showed that an optimal code is built by uniformly placing codewords on an n-dimensional sphere. An upper and a lower bound for the word error rate performance Pew of such a spherical code have been established by Shannon on anAWGN channel for finite n.""A study is made of coding and decoding systems for a continous channel with an additive gaussian noise and subject to an average power limitation at the transmitter. Upper and lower bounds are found for the error probability in decoding with optimal codes and decoding systems. These bounds are close together for signaling rates near channel capacity and also for signaling rates near zero, but diverge in between. Curves exhibiting these bounds are given."" (Shannon p. 611).Hook & Norman: 898. ‎

‎Correspondence respecting the proposed Channel Tunnel and Railway. Presented to both Houses of Parliament.(+) Report of the Commissioners for the Channel Tunnel and Railway.‎

‎London, Harrison and Sons, 1875-76. Folio. Bound together in orig. blue printed boards, clothbacked. IV,766 pp. 4 folded maps and plans.‎