(A) In Modern Cryptography, symmetric
key algorithms use same key both for Encryption and Decryption.
(B) The symmetric cipher DES (Data
Encryption Standard) was widely used in the industry for security product.
(C) The AES (Advanced Encryption
Standard) cryptosystem allows variable key lengths of size 56 bits and 124
bits.
(D) Public key algorithms use two different
keys for Encryption and Decryption.
Answer C
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