alleryThe two middle letters M and N of the alphabet are paired in the Atbash cipher. What does M become?
- O
- M
- N
- L
Show answer and solution
Correct answer: C. N
M is the thirteenth letter and is swapped with the fourteenth, N.
SSC CGL Coding Decoding — practice questions — page 3
Explore 95 free Coding Decoding questions in SSC CGL Reasoning. Open each question or exercise to read its content, reference answers and available explanation.
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The two middle letters M and N of the alphabet are paired in the Atbash cipher. What does M become?Read the answer and worked solution →Writing every letter as its mirror in the alphabet (A with Z), how is BABY coded?Read the answer and worked solution →Atbash was originally used to encrypt which alphabet?Read the answer and worked solution →In Jeremiah, Sheshach is described as an Atbash form of which city?Read the answer and worked solution →Atbash can be viewed as a special case of which cipher?Read the answer and worked solution →Which type of cipher rearranges the plaintext units but leaves the units unchanged?Read the answer and worked solution →A simple substitution cipher operates on what unit?Read the answer and worked solution →A cipher that substitutes larger groups of letters is called what?Read the answer and worked solution →What does a monoalphabetic cipher use over the entire message?Read the answer and worked solution →Which cipher uses a number of different substitutions at different positions in the message?Read the answer and worked solution →Which two ciphers are named as the simplest substitution ciphers?Read the answer and worked solution →Al-Kindi described how to crack simple substitution ciphers in a manuscript written around when?Read the answer and worked solution →A mixed alphabet uses the keyword zebras, followed by the remaining letters in order. What does B become?Read the answer and worked solution →The cipher alphabet starts with the keyword zebras, then the other letters in the usual order. How is SEA written?Read the answer and worked solution →With a mixed alphabet beginning ZEBRAS and then the rest in order, EAR is coded as what?Read the answer and worked solution →A mixed alphabet starts with the keyword zebras. Which letter follows ZEBRAS in the cipher alphabet?Read the answer and worked solution →In a mixed alphabet from the keyword zebras, ciphertext ZQ stands for which plain word?Read the answer and worked solution →Ciphertext is often written in five-letter groups, a habit dating from which mode of sending messages?Read the answer and worked solution →What are nulls in a substitution cipher message?Read the answer and worked solution →In the pigpen cipher, the ciphertext consists of what?Read the answer and worked solution →A salesperson's price code writes 120 as MAT and 5256 as PAPR. What does MAP stand for?Read the answer and worked solution →In a price code, MAT is 120, PAPR is 5256 and OFTK is 7803. What number is TOP?Read the answer and worked solution →The nomenclator cipher is named after whom?Read the answer and worked solution →In which year did Francesco I Gonzaga use the earliest known homophonic substitution cipher?Read the answer and worked solution →Which kind of cipher did Mary, Queen of Scots use while imprisoned by Elizabeth I?Read the answer and worked solution →In what form did Alberti describe polyalphabetic ciphers in 1467?Read the answer and worked solution →How many alphabets does the Gronsfeld cipher use, with a numerical keyword?Read the answer and worked solution →Which polyalphabetic cipher is self-inverse, so one key sheet both encrypts and decrypts?Read the answer and worked solution →Which cipher makes its key very long by using text from a book?Read the answer and worked solution →Which cipher mixes the plaintext into the key to avoid periodicity?Read the answer and worked solution →
Worked practice questions
Writing every letter as its mirror in the alphabet (A with Z), how is BABY coded?
- ZYZB
- YAYB
- YZBY
- YZYB
Show answer and solution
Correct answer: D. YZYB
B maps to Y, A maps to Z, B maps to Y again and Y maps to B.
Atbash was originally used to encrypt which alphabet?
- Latin
- Greek
- Arabic
- Hebrew
Show answer and solution
Correct answer: D. Hebrew
Atbash began as a cipher for the Hebrew alphabet and was later adapted to other scripts.
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