Neco 2022 Computer Studies Question 18
Practice objective / multiple choice question 18 from the 2022 Neco Computer Studies examination.
A company stores user passwords as salted SHA‑256 hashes. For each user a unique 4‑character alphanumeric salt (each character can be an uppercase letter A‑Z or a digit 0‑9) is concatenated with the password before hashing. An attacker obtains the database containing usernames, salts and the corresponding hash values. Explain why the attacker cannot directly recover the original passwords. Then, assuming a password is known to be exactly six lowercase letters (a‑z), calculate the total number of possible salted‑hash inputs that the attacker would have to try for a single user.
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About This Question
This is Neco 2022 Computer Studies Question 18. It is one of the objective questions from the 2022 Neco Computer Studies examination.
Difficulty level: Medium .
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