Cryptanalysis of an Enciphered Code Problem: Where an Additive Method of Enchipherement Has Been Used (Cryptographic Series)
Aegean Park Pr, June 1979. Paper Back. {8 & 1/4' x 10& 3/4'} Quarto. Beige cardstock cover. Foxing/dust stains top textblock edge. Clean internally with no underlining, side notes and etc. 174 pages. More