Discussion
Which one of the following is not a Public Key cryptography ?
Answer: C
The one that is not public-key cryptography is AES.
The Advanced Encryption Standard (the Rijndael cipher, adopted by NIST in 2001) is a symmetric block cipher: the same secret key encrypts and decrypts, with 128-bit blocks and 128, 192 or 256-bit keys.
The rest are all public-key (asymmetric) schemes. RSA rests on the difficulty of factoring large numbers, and ECC (elliptic curve cryptography) on the elliptic-curve discrete logarithm problem. Kyber is a lattice-based key-encapsulation mechanism designed to resist quantum computers, standardised by NIST in 2024 as ML-KEM.
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