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Which of the following symmetric key algorithms are exa…

Which of the following symmetric key algorithms are examples of block ciphers? (Choose three.)

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A.
RC4

B.
3DES

C.
AES

D.
MD5

E.
PGP

F.
Blowfish

Explanation:
B: Triple DES (3DES) is the common name for the Triple Data Encryption Algorithm (TDEA or Triple DEA)
symmetric-key block cipher, which applies the Data Encryption Standard (DES) cipher algorithm three times to
each data block.
C: Advanced Encryption Standard (AES) is a block cipher that has replaced DES as the current standard, and it
uses the Rijndael algorithm. It was developed by Joan Daemen and Vincent Rijmen. AES is the current product
used by U.S. governmental agencies.
F: Blowfish is an encryption system invented by a team led by Bruce Schneier that performs a 64-bit block
cipher at very fast speeds.

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