Cryptography 101
- By Melissa Salpietra
- Posted 07.01.07
- NOVA scienceNOW
You can make a message secret in countless different ways. One common way is to use a substitution cipher, in which one letter is substituted for another. Another is to employ a transposition cipher, in which the letters change position within the message. In this interactive, explore examples of a substitution cipher and two kinds of transposition cipher.
Credits
Image
- (Kryptos)
- © NOVA/WGBH Educational Foundation
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