Substitution Ciphers

 In ciphers, one character represents another.

In codes, one character or symbol can represent a group of letters or words, so all emojis are codes, for example.

This is a simple substitution cipher, where I have randomly chosen one letter to represent another.





Can you tell me which great man said it?

Tip: The most commonly used letters in the English language are:


The most commonly used words in written English (according to an analysis of the Oxford English Corpus, over 2 billion words)  are:

    1. the
    2. be
    3. to
    4. of
    5. and
    6. a
    7. in
    8. that
    9. have
    10. I
  1. it
  2. for
  3. not
  4. on
  5. with
  6. he
  7. as
  8. you
  9. do
  10. at
  1. this
  2. but
  3. his
  4. by
  5. from
  6. they
  7. we
  8. say
  9. her
  10. she
  1. or
  2. an
  3. will
  4. my
  5. one
  6. all
  7. would
  8. there
  9. their
  10. what

As with all averages, these apply best to large samples, but they often help us to crack ciphers and codes.

There are many other types of substitution ciphers and cipher-based codes. Why not try them out by clicking on the links below?

Substitution Ciphers With Keys          Caesar Ciphers          Advanced Caesar Ciphers

Column Codes                                         Pigpen Ciphers         Babington’s Code