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Codes, Ciphers, and Secret Writing.
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Paperback
from Dover Pubns (October 1, 1984); titled "Codes, Ciphers and Secret Writing"
9780486247618 | details & prices | 96 pages | 5.50 × 8.50 × 0.25 in. | 0.30 lbs | List price $5.95
About: Explains various methods used in cryptography and presents examples to help readers in breaking secret codes
About: Explains various methods used in cryptography and presents examples to help readers in breaking secret codes
School and Library
from Simon & Schuster (October 1, 1972)
9780671652012 | details & prices | Rec. grade levels 4-6 | List price $6.95
About: Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
About: Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.