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’S“–ŽาFX์ ”Ž”VEŽRŒ๛ ‰pE‘บˆไ ƒ ‘ๆ02‰๑ 10/18/2000

Monoalphabetic Cipher (’PŠทŽšˆร†)

• Based on gsubstitution (ŠทŽš)
  
  
• Generalization of Caesar cipher
  
  
  • Arbitrary mapping letter to letter
    
    
  • Possible combinations: 26! = 4ฅ1026 possibilities
    
    
    
    
  plaintext code: a b c d e f g h i f k l m n o p q r s t u v w x y z
  
  ciphertext code: m n b v c x z a s d f g h j k l p o i u y t r e w q
  
  
• How to attack
  
  
  • Statistical analysis of letter frequencies