ITPEC FE Morning April 2019 Question 40
ITPEC FE Morning April 2019 — Question 40 of 80
Public Key Cryptography Algorithm — RSA is the public key (asymmetric) encryption algorithm
The correct answer is c) RSA.
RSA (Rivest–Shamir–Adleman) uses a key pair — a public key for encryption and a private key for decryption — making it a public key (asymmetric) cryptography algorithm.
Why not the others:
- a) AES — a symmetric encryption algorithm (single shared key)
- b) KCipher-2 — a symmetric stream cipher (single shared key)
- d) SHA-256 — a hash function, not an encryption algorithm at all; it produces a fixed-length digest and cannot be reversed
Key rule: Symmetric = one key (AES, DES, KCipher-2). Asymmetric = key pair (RSA, ECC, ElGamal). Hash = one-way digest, no key for encryption (SHA, MD5).
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