adjective

using letters and numbers

verb

if someone breaks a code (=a secret way of writing), they learn how to understand it

completely automated public Turing test to tell computers and humans apart: a system for checking that a human is using a computer, often consisting of a group of letters in strange shapes that the person must type again

noun

a secret system of writing, used for sending messages so that no one can understand them unless they know the system

noun

a system of words, numbers, or signs used for sending secret messages. To put a message into code is to encode it, and to translate it back from code is to decode it

noun

a set of numbers or letters that gives information about something, for example by showing what it is or when it was made

verb

to mark something with a code that gives information about it

verb

to mark something with a code instead of a name, so that people do not know what it is

verb

to put a message in code so that it is secret

adjective

marked with letters or numbers that give information

adjective

marked with numbers or letters instead of a name

adjective

written using a secret system of words or signs

noun

a name for someone or something that you use when you want to keep their real name secret

noun

a secret message written in code

noun

the use of codes to put information on a website into a form that can only be read by users with permission

another spelling of cipher

noun

a long signal used for sending messages in morse code. Short signals are called dots.

verb

to succeed in understanding the meaning of something written in a secret system of letters or symbols called a code

verb

to succeed in understanding the meaning of a message written in code

verb

to change digital electronic signals into a picture and sound on your television

verb

to change information that was in a code that could not be read or understood into a form that can be read and understood

noun

a short flash of light or sound used in morse code (=a system for sending messages, used especially in the past). A long flash or sound is called a dash.

verb

to put secret information into code (=a system of words, numbers, or symbols that hides its real meaning)

verb

to put information into code (=a system of words, numbers, or symbols that hides its real meaning)

noun

a system of instructions that are added to documents in the form of codes to tell a computer how to print or organize the information

noun

a system of sending messages using signals of sound or light that represent the letters of the alphabet

noun

a way of keeping Internet messages secret in which a single key (=letter or number) changes the message into code and back again

noun

a system for sending messages in which you hold two flags in various positions to represent different letters and numbers

noun

a quick way of writing that uses symbols to represent letters, words, or phrases, used especially when you write what someone is saying as they are talking

verb

to change a signal or message that has been sent in code into a form that you can understand

noun