The casebook 8 entries
How the codes
come apart.
Every case file hides its secrets behind a cipher of one kind or another. These are the working notes: what each code is, where it came from, and the method that cracks it.
Codebreaking 24 July 2019
Column Ciphers
Column Ciphers, or Poem ciphers have been in use by the intelligence services for some time.
Read the notes-
Codebreaking 10 June 2019
Secret words and secret messages
There are a variety of ways you can get hidden messages into ordinary messages.
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Codebreaking 21 May 2019
Vigenère cipher
A Vigenere cipher is a form of letter substitution cipher that is incredibly difficult to break.
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Codebreaking 20 May 2019
Caesar Ciphers
Caesar ciphers are one of the earliest known and simplest ciphers we use in Cosykiller.
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Codebreaking 15 May 2019
Directional codes
Directional codes are probably some of the easiest codes to work with in Cosykiller.
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Codebreaking 8 May 2019
One Time Cipher Pads
One time Cipher Pads are one of the hardest ciphers to solve, and yes – sorry – they do crop up in cosykiller.
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Codebreaking 17 April 2019
Breaking Letter Substitution codes
A Letter Substitution Cipher replaces the letters in the alphabet with symbols or another random letter.
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Codebreaking 17 April 2019
Knock Code
Knock Codes, sometimes called Tap Code come up intermittently in our Cosykiller boxes.
Nothing filed under that yet.
Put it into practice
Reading about ciphers is one thing.
Solving one is another.
Every technique on this page turns up somewhere in a Cosykiller box — usually when you least want it to.