SY0-501 · Question #243
Which of the following cryptographic algorithms is irreversible?
The correct answer is B. SHA-256. SHA-256 is an irreversible cryptographic hash function that produces a fixed-size output, designed so that the original input cannot be reconstructed from the hash value.
Question
Which of the following cryptographic algorithms is irreversible?
Options
- ARC4
- BSHA-256
- CDES
- DAES
How the community answered
(58 responses)- A3% (2)
- B78% (45)
- C7% (4)
- D12% (7)
Why each option
SHA-256 is an irreversible cryptographic hash function that produces a fixed-size output, designed so that the original input cannot be reconstructed from the hash value.
RC4 is a symmetric stream cipher used for encryption, which is by definition designed to be reversible to decrypt the original plaintext from the ciphertext using the correct key.
SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function, which takes an input and produces a fixed-size alphanumeric string called a hash value. This process is inherently one-way, meaning it is computationally infeasible to reverse the hash value back to the original input data.
DES (Data Encryption Standard) is a symmetric block cipher used for encryption, meaning it is designed to be reversible to decrypt the original plaintext from the ciphertext using the correct key.
AES (Advanced Encryption Standard) is a symmetric block cipher used for encryption, meaning it is designed to be reversible to decrypt the original plaintext from the ciphertext using the correct key.
Concept tested: Cryptographic hash functions vs. encryption algorithms
Source: https://learn.microsoft.com/en-us/windows/win32/seccrypto/cryptographic-hash-functions
Topics
Community Discussion
No community discussion yet for this question.