Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
Editions · 5
Paperback
1972 · Simon and Schuster
96 pp · EN
9780671652012
Paperback
1978 · Simon & Schuster
114 pp · EN
9780671299545
Paperback
1984 · Dover
96 pp · EN
9780486247618
Paperback
2013 · Dover Publications, Incorporated
EN
9781306325011
Paperback
2013 · Dover Publications, Incorporated
EN
9780486320311
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