People
This Polish mathematician first broke Enigma.
Who is Marian Rejewski?
This is the Caesar decryption of IRXU using the key a-D.
What is "four"?
This code (which is not a cipher) uses two symbols to represent letters and numbers, originally for use in telegraphs.
What is Morse code?
A prime integer has this many positive factors.
What is two?
This is the value of 4!.
What is 24?
This cipher was invented by Charles Wheatstone, but was not named after him.
What is Playfair?
This is the monoalph decryption of OFUE using the keyword TASTE.
What is "nerd"?
A monoalphabetic substitution cipher has this many possible keys.
What is 26! keys?
This term is used to describe the interchanging (or moving) of symbols in a cipher.
What is transposition?
This is the number of ways to select two objects from a pool of 5 and put them in order (number, not formula).
What is 20?
This British mathematician was tasked with mechanizing the breaking of Enigma at Bletchley Park.
Who is Alan Turing?
This is the Vigenere decryption of GOCS using the keyword NO.
What is "tape"?
A Kasiski examination is used to determine this.
What is the length of a Vigenere keyword?
This term refers to a descending product of positive integers that are less than a certain number.
What is a factorial?
This is the minimum number of moves required to solve a 3-disk Tower of Hanoi puzzle.
What is 7?
Independently of Kasiski, this person discovered a general attack on the Vigenere cipher.
Who is Charles Babbage?
This is the Playfair decryption of HC PQ using the keyword LURKS.
What is "crop"?
In the ADFGVX cipher, the key grid holds this many symbols.
What is 36?
This term means a piece of known or suspected plaintext.
What is a crib?
This is the prime factorization of 20.
What is 2*2*5?
Military officials from this country first broke the ADFGVX cipher, although they did not have a general method for doing so.
What is France?
This is the Enigma decryption of NUL with rotor setting 123 AAA and no plugboard.
What is "ace"?
In the Playfair cipher, each plaintext letter can only encrypt to this many other letters.
What is five?
This term is used to refer to a pair of letters.
What is a digraph?
This is the number of ways to select a group of 3 objects from a pool of 5 (number, not formula).
What is 10?