Midway Atoll

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Midway Atoll
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Captain Joseph J. Rochefort
Captain Thomas H. Dyer, Chief Cryptoanalyst of
Rocheforts Unit
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Plain Text the message that will be put in
secret form
Cipher Text the message in its secret form
Key the secret information needed
to decode
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Candidates for US President in 1876
Samuel J. Tilden Democrats
Rutherford B. Hayes Republicans
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Edward S. Holden
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A German Enigma Machine
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Brass Confederate Cipher Disk
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The most significant instance of codebreaking in
history
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