alleryStart learning →What are nulls in a substitution cipher message?
ARepeated keywords
BGroup counts shown
CMixed alphabets
DPadding characters
Answer & Solution
Correct answer: D. Padding characters
Nulls are filler characters that decrypt to nonsense so the receiver can spot and discard them.
Keep practising Coding Decoding
Browse all Coding Decoding questions for SSC CGL, or explore more Reasoning topics.
Related questions
A code replaces each letter by the next one in the alphabet. What word does IBM stand for?In a code each letter is replaced by the next letter in the alphabet. How is BAG written?By unicity distance, how many ciphertext letters are needed to crack a mixed alphabet subsAbout how many bits of strength do the 26! possible substitution alphabets give?In a Vigenère tabula recta, how does each successive row differ from the one above?Which cipher mixes the plaintext into the key to avoid periodicity?Which cipher makes its key very long by using text from a book?Which polyalphabetic cipher is self-inverse, so one key sheet both encrypts and decrypts?