Which of the following is not a one-way hashing algorithm?

The correct answer is B. RC4. RC4 is a symmetric stream cipher (Rivest Cipher 4), not a hashing algorithm. It is used for encryption/decryption and is reversible with the correct key. MD2 (Message Digest 2), SHA-1 (Secure Hash Algorithm 1), and HAVAL are all one-way cryptographic hash functions that produce…

Submitted by ashley.k· Apr 18, 2026Cryptography

Question

Options

AMD2
BRC4
CSHA-1
DHAVAL

How the community answered

(32 responses)

B
91% (29)
C
3% (1)
D
6% (2)

Explanation

RC4 is a symmetric stream cipher (Rivest Cipher 4), not a hashing algorithm. It is used for encryption/decryption and is reversible with the correct key. MD2 (Message Digest 2), SHA-1 (Secure Hash Algorithm 1), and HAVAL are all one-way cryptographic hash functions that produce a fixed-length digest from arbitrary-length input and are computationally infeasible to reverse.

Topics

#Hashing Algorithms#Encryption Algorithms#Cryptographic Primitives#RC4

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