Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
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Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
Read Less
Add this copy of Secrets With Ciphers and Codes to cart. $74.56, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 1969 by Atheneum.
