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10 cards from this deck
Converting plaintext into ciphertext
Data in readable, understandable format
Substitution cipher shifting letters by fixed positions
Exploits predictable letter patterns to crack ciphers
'e' appears ~12.7% of the time
Rearranges letters rather than substituting them
One-time pad method invented ~100 years ago
Key as long as plaintext, used once then destroyed
Combines plaintext & key bits to create ciphertext
Theoretically breakable but impractical with current tech
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