Test Series - computer fundamental

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Test Number 95/95

Q: These ciphers replace a character or characters with a different character or characters, based on some key.
A. Polyalphabetic substitution based
B. Transposition-based
C. Substitution based
D. Mono alphabetic substitution based
Solution: In mono alphabetic substitution-based cipher, a character is replaced with some other character or multiple characters, based on some key.
Q: Encryption is the study of creating and using decryption techniques.
A. True
B. False
C. .
D. none
Solution: The statement is false. Cryptography is the study of creating and using encryption and decryption techniques.
Q: A type of cipher that uses multiple alphabetic strings.
A. Substitution based
B. Transposition-based
C. Polyalphabetic substitution based
D. Mono alphabetic substitution based
Solution: These ciphers are similar to that of mono alphabetic ciphers. Multiple strings are used to encode the plain text.
Q: An encryption technique with 2 keys is ______________
A. Monoalphabetic Cipher
B. Cryptography
C. Private key cryptography
D. Public key cryptography
Solution: It is called as public key cryptography. It has 2 keys: a private key and a public key.
Q: In public key cryptography, a key that decrypts the message.
A. public key
B. unique key
C. private key
D. security key
Solution: Public key cryptography has 2 keys. They are private key and a public key. The public key encrypts the message. The private key decrypts the message.
Q: DES stands for?
A. Data Encryption Standard
B. Data Encryption Statistics
C. Data Encryption System
D. Data Encryption Sequence
Solution: DES stands for Data Encryption Standard. It was created in 1977 and went into operation from 1990s.
Q: Under DES, the data encryption standard took a 64-bit block of data and subjected it to ______ levels of encryption.
A. 64
B. 8
C. 16
D. 4
Solution: The answer is 16. It was subjected to 16 levels of encryption. DES is the data encryption standard.
Q: Triple-DES has ______ keys.
A. 1
B. 2
C. 5
D. 4
Solution: There are 2 keys in triple DES as well. The private and the public key. It can also have 3 unique keys.
Q: Encryption standard that is selected by the US government to replace DES.
A. AES
B. BES
C. CES
D. DES
Solution: AES is Advanced Encryption Standard. It was selected by the US government. It is used to replace DES.
Q: An electronic document that establishes your credentials when you are performing transactions.
A. Digital code
B. OTP
C. E-mail
D. Digital certificate
Solution: Digital certificate is an electronic document that is responsible for secure internet transactions.

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