What is the name of the cipher that shifts each letter a fixed number of places along the alphabet?
AnswerCaesar cipher
The Caesar cipher is named after Julius Caesar, who reportedly used a shift of three.
Tech · Facts & stats
Codes facts & stats
7 fact-checked facts about codes and ciphers, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does QR stand for in 'QR code'?
AnswerQuick Response
QR stands for Quick Response, a 2D barcode that can be read quickly by a camera.
Going deeper
Using a Caesar cipher with a shift of 3, what does the letter A become?
AnswerD
Shifting A forward three places gives B, C, then D.
What does ASCII stand for?
AnswerAmerican Standard Code for Information Interchange
ASCII is a character encoding standard that assigns numbers to letters, digits and symbols.
How many different characters can standard 7-bit ASCII represent?
Answer128
Seven bits give 2^7 = 128 possible codes, numbered 0 to 127.
Expert level
How many digits does a standard UPC-A barcode encode?
Answer12
UPC-A barcodes encode 12 digits, including a final check digit; the related EAN-13 uses 13.
In the Atbash cipher applied to the English alphabet, what does the letter A become?
AnswerZ
Atbash reverses the alphabet, so A swaps with Z, B with Y, and so on.
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