More History

• Leon Battista Alberti

• 1452

• Polyalphabetic substitution

• ABCDEFGHIJKLMNOPQRSTUVWXYZ Plaintext

• FGUQHXSZACNDMRTVWEJBLIKPYO T00

• OFGUQHXSZACNDMRTVWEJBLIKPY T01

• YOFGUQHXSZACNDMRTVWEJBLIKP T02

• PYOFGUQHXSZACNDMRTVWEJBLIK T03

• ...

• GUQHXSZACNDMRTVWEJBLIKPYOF T25

• Cycle different keys

• Giovan Batista Belaso

• 1553

• Keywords

• HowdyMisterJones

  • 1st letter offset by H
  • 2nd letter offset by O
  • ...
  • 17the offset by S
  • 18th offset by H

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