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cipher

 
     
  A symbol, whether letter or number, which represents a single letter or number, as opposed to a code where plurals are employed. A message written in cipher is said to have been ‘encrypted’. The distinction between a cipher and code is a purely technical one and though it is still common to see references to ‘codes and ciphers’, the terms are often used today as synonyms. Consistently with this, messages are said to be ‘deciphered’ when a government agency translates into plain text one of its own encrypted messages, whether a cipher or a code had been employed. Broken ciphers are said to have been ‘decrypted’.


The key to a system of symbols used in this manner.
 
 

 

 

 
 
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