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1.
How many 4-digit PINs are possible if no digit may be repeated?
Correct Answer: B [5,040]
Explanation:
10 × 9 × 8 × 7 = 5,040.
2.
Ten branches each need a separate secret key with every other branch (symmetric). How many keys are needed?
Correct Answer: E [45]
Explanation:
n(n − 1)/2 = 10 × 9 / 2 = 45.
3.
Stretch – With a Caesar shift of 5, which ciphertext represents SAFE?
Correct Answer: D [XFKJ]
Explanation:
S(18)+5 = 23 X; A → F; F → K; E → J.
4.
Stretch – A message encrypted with Caesar shift 5 reads HTIJ. The original word is:
Correct Answer: A [CODE]
Explanation:
Shift each letter back by 5: H→C, T→O, I→D, J→E.
5.
Consider the following statements:
I. A virus needs a host program and spreads when that program is run or shared.
II. A Trojan horse copies itself to other computers on the network.
III. A botnet is a group of infected computers controlled remotely.
Which of the statements given above is/are correct?
I. A virus needs a host program and spreads when that program is run or shared.
II. A Trojan horse copies itself to other computers on the network.
III. A botnet is a group of infected computers controlled remotely.
Which of the statements given above is/are correct?
Correct Answer: B [Only I and III]
Explanation:
I and III true; II false – a Trojan does not self-replicate (a worm does).
6.
Consider the following statements:
I. Symmetric encryption is generally faster than asymmetric encryption.
II. In asymmetric encryption, data encrypted with a public key is decrypted with the matching private key.
III. Hashing allows the original data to be recovered using the hash key.
Which of the statements given above is/are correct?
I. Symmetric encryption is generally faster than asymmetric encryption.
II. In asymmetric encryption, data encrypted with a public key is decrypted with the matching private key.
III. Hashing allows the original data to be recovered using the hash key.
Which of the statements given above is/are correct?
Correct Answer: C [Only I and II]
Explanation:
I and II true; III false – hashing is one-way and has no key.
7.
A code is made of 2 capital letters (A–Z) followed by 3 digits; repetition is allowed. How many codes are possible?
Correct Answer: B [6,76,000]
Explanation:
26 × 26 × 10 × 10 × 10 = 6,76,000.
8.
A login uses a password and an OTP sent to the registered mobile. The factors used are:
Correct Answer: D [something you know + something you have]
Explanation:
Password = know; OTP on phone = have.
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