Editing Glossary 2011

* '''Block Cipher''' – a key cipher operating on fixed-length groups of letters (blocks)
* '''Cipher''' – Any general system for hiding the meaning of a message by replacing each letter in the original message with another letter.
* '''Cipher Cross-off List''' – a page on the project’s wiki page that contains all details of the project’s cipher investigations. Available at: [[Cipher Cross-off List]]
* '''CipherGUI''' – The name given to the interactive GUI, developed by the project this year, that implements multiple ciphers.
* '''Ciphertext''' – The message (or plaintext) after encryption.
* '''crawler4j''' – The OTS Java-based web crawler used by the project this year.
* '''Digraph cipher''' – A cipher that encrypts by enciphering the plaintext letters in pairs.
* '''Frequency Analysis''' - the study of the frequency of letters or groups of letters in a ciphertext usually performed in order to solve a substitution cipher.
* '''Index of Coincidence''' – the probability that any two randomly chosen characters within a text (plaintext or ciphertext) are the same letter.
* '''Key''' – the element that turns the general encryption algorithm into a specific method for encryption.
* '''Mono-alphabetic cipher''' – a cipher in which the cipher alphabet is fixed throughout the encryption process.
* '''Pattern Matcher''' – the module of the Web Crawler search application developed for the project responsible for detecting patterns in web-page content.
* '''Plaintext''' – the original message before encryption.
* '''Poly-alphabetic cipher''' – a cipher in which the cipher alphabet changes during encryption.
* '''Polybius square''' - simple form of fractionating an alphabet into a smaller set of symbols. Most common form is a 5x5 square filled in with alphabet. Letters can be replaced by [row][column] numbers between 1 and 5 each.
* '''Polygraphic cipher''' – a cipher which substitutes plaintext letters in groups larger than one.
* '''Regular Expression''' or '''Regex''' - a concise and flexible means for matching strings of text, such as particular characters, words, or patterns of characters.
* '''Rubaiyat of Omar Khayyam''' – the book of Persian Poems linked to the Somerton Man case.
* '''Seed page''' – the web page a user enters specifying the starting point from which a web crawler will operate.
* '''Stenography''' – the science of hiding the existence of a message, as opposed to cryptography which is the science of hiding the meaning of the message.
* '''Substitution Cipher''' – a system of encryption in which each letter of a message is replaced with another character, but retains its position within the message.
* '''Transposition Cipher''' – a system of encryption in which each letter of a message changes its position within the message, but retains its identity.
* '''Web Crawler''' - a program that browses the internet in a methodical and automated manner.

[[Final Report 2011]]