Editing Null cipher (section)

== Definition of a null ==
Put simply, a null cipher is any cipher which involves a number of ''nulls,'' or decoy letters. As well as the methods shown above, a null cipher could be plaintext words with nulls placed in designated areas or even a plaintext message broken up in different positions with a null at the end of each word.<ref name=":4" /><ref>{{Cite book |last=Moore |first=Gareth |title=Explorer Academy Codebreaking Activity Adventure |year=2019 |publisher=National Geographic Books |isbn=9781426333071}}</ref> However, a message with only a couple nulls (for example, one at the beginning and one at the end) is ''not'' a null cipher.

A null cipher is technically only a term for hidden letters or words within an otherwise unimportant message, however, it is occasionally used for the entire category of concealment ciphers.<ref name=":2" />