Historically many ciphers have existed, for instance the specific Caesar shift cipher, the standard monosubstitution cipher and ciphers containing monosubstitution mixed with void characters and the odd code word.

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The Key Distribution Problem

The key distribution problem is something that seems to create an insoluble chicken and egg situation. ...

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The Historical Importance Of Codes And Ciphers

Codes and ciphers whilst for most of us the domain of a bit of fun and a challenge, are actually incredibly important. ...

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The Difference Between A Code And A Cipher

As alluded to in some of the other items in this section, there are differences between a code and a cipher. ...

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Quantum Mechanics And Cryptography: A Truly Unbreakable Cipher

One of the interesting elements about quantum theory is that its whackiness and counter intuitive results coupled with the way that it works in explaining so many phenomena means that we can reliably apply quantum theory to practice. ...

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One Way Functions

A one way function is one that cannot be reversed. ...

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Letter Frequencies In English

It is always useful to know how frequent letters are in English. ...

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Keyword Puzzles: Tips On Solving

Keyword puzzles are known under various names such as codewords, codecracker and so on. ...

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How To Work Out The Factors Of A Large Prime At Speed

As usual the answer to working out the factors of a large prime number requires a leap of faith. We all know that the strongest point of a method is the place you should least consider probing....

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How To Make A Substitution Cipher Harder To Solve

If you have a standard substitution cipher of a reasonable length it can usually be solved through frequency analysis. ...

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How To Create An Unbreakable Cipher Code

The best and easiest way to make an unbreakable cipher - strictly rather than a code, that is a letter substitution rather than a word substitution, is to use a one off key text. ...

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How To Break A Secret Code

Perhaps not something that most of us will need to do except for fun, but particularly in the last few ...

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How RSA Encryption Works

RSA is a type of encryption known as public key encryption. That is anyone can access the specific public key and therefore encrypt. But the key is that the key is asymmetric: it will encrypt data but it will not decrypt data. Only someone with the private key can perform the decryption. ...

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How Quantum Physics Could Help Decipher A Code

There are two interesting consequences of applying quantum physics to codes: ...

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How Hieroglyphs Were Deciphered

Hieroglyphs were an interesting example of decryption and cracking an ancient code to reveal the secrets and tales it tells and enabled us to further our understanding of ancient Egyptian culture and civilisation. ...

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