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!SLIDE

Substitution Cipher

!SLIDE

Substitution Cipher

a = i b = c c = u
d = h e = v f = d
g = j h = q i = z
...

!SLIDE

Extended Substitution Cipher

a = i b = c c = u
d = h e = v f = (
g = 5 h = <space> i = z
...
7 = j 8 = q 9 = d

!SLIDE bullets incremental

Substitution Cipher Vulnerabilities

  • Letter Frequency Analysis
  • Word Frequency Analysis
  • Temporal Analysis
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