Cryptography Fundamentals Questions and Answers

Q: Encrypt “INTERNET” using transposition cipher with the following key :3 5 2 1 41 2 3 4 5

The cipher text is TRNIE TZENZ.Split the plaintext into blocks of five, padding the last with Z: INTER and NETZZ. The key's top row tells which plaintext position goes into each cipher position: the first cipher letter is plaintext letter 3, then 5, 2, 1 and 4.INTER: letters 3, 5, 2, 1, 4 are T, R, N, I, E, giving TRNIE. NETZZ: letters 3, 5, 2, 1, 4 are T, Z, E, N, Z, giving TZENZ.The other options are wrong arrangements: (B) simply swaps the two padded blocks, and (A) and (C) do not follow the key's order of positions.

Q: Encryption transforms data to

Encryption transforms data into cipher text.Encryption applies an algorithm and a key to readable plain text, producing unreadable cipher text. Only someone with the right key can reverse it by decryption to recover the plain text. That reversibility with a key is what separates encryption from other transformations.Plain text is the input to encryption, not its output. Hash values come from hashing, a one-way function with no key that cannot be reversed. Metadata is data about data, such as a file's size or timestamps.

Encrypt “INTERNET” using transposition cipher with the following key :

3 5 2 1 4
1 2 3 4 5

A.RINTE ZZNET
B.ZZNET INTER
C.ETRNI NZETZ
D.TRNIE TZENZ

Exam Year(s)

MH SET - 2019, SET Exam - 2019,

Answer: D

The cipher text is TRNIE TZENZ.

Split the plaintext into blocks of five, padding the last with Z: INTER and NETZZ. The key's top row tells which plaintext position goes into each cipher position: the first cipher letter is plaintext letter 3, then 5, 2, 1 and 4.

INTER: letters 3, 5, 2, 1, 4 are T, R, N, I, E, giving TRNIE. NETZZ: letters 3, 5, 2, 1, 4 are T, Z, E, N, Z, giving TZENZ.

The other options are wrong arrangements: (B) simply swaps the two padded blocks, and (A) and (C) do not follow the key's order of positions.

Discuss in Forum

Encryption transforms data to

A.Plain text
B.Cipher text
C.Metadata
D.Hash values

Exam Year(s)

Tripura Public Service Commission - 2026,

Answer: B

Encryption transforms data into cipher text.

Encryption applies an algorithm and a key to readable plain text, producing unreadable cipher text. Only someone with the right key can reverse it by decryption to recover the plain text. That reversibility with a key is what separates encryption from other transformations.

Plain text is the input to encryption, not its output. Hash values come from hashing, a one-way function with no key that cannot be reversed. Metadata is data about data, such as a file's size or timestamps.

Discuss in Forum

Data Encryption Techniques are particularly used for ______.

A.protecting data in Data Communication System.
B.reduce Storage Space Requirement.
C.enhances Data Integrity.
D.decreases Data Integrity.

Exam Year(s)

UGC NET - 2012,

Answer: A

Data encryption techniques are used for protecting data in a data communication system. The data is converted to a form that cannot be read without the key, so it is safe while it travels on the network and from tapping.

Encryption does not reduce the storage space (compression does that), and it does not itself improve or decrease data integrity, which is the task of checks like checksums and hashes. So the other options are wrong.

Discuss in Forum

Loading…

Topics

Other Subjects

Tags: Cryptography Fundamentals Questions and Answers || Cryptography Fundamentals MCQ Questions and Answers || Cryptography Fundamentals GK Questions and Answers || Cryptography Fundamentals GK MCQ Questions || Cryptography Fundamentals Multiple Choice Questions and Answers || Cryptography Fundamentals GK || GK on Cryptography Fundamentals || Cyber Security Questions and Answers || Cyber Security MCQ Questions and Answers || Cyber Security GK Questions and Answers || GK on Cyber Security

Cryptography Fundamentals Questions and Answers

Topics

Other Subjects

About Us

Stay informed about all important Dates & Notifications