01049nam a2200325 i 450099100074826970753620020507173055.0980216s1988 uk ||| | eng 0198532873b10751841-39ule_instLE01301704ExLDip.to Matematicaeng652.8AMS 94AAMS 94A60AMS 94BWelsh, Dominic440809Codes and cryptography /Dominic Welsh1st ed.Oxford :Clarendon Press ; New York : Oxford University Press,1988ix, 257 p. ;24 cm.Includes Bibliography and indexCiphersCryptography.b1075184126-04-0728-06-02991000748269707536LE013 94A WEL11 (1988)12013000096421le013-E0.00-l- 02020.i1084489228-06-02Codes and cryptography79785UNISALENTOle01301-01-98ma -enguk 01