SY0-301 · Question #737
Which of the following are restricted to 64-bit block sizes? (Select TWO).
The correct answer is B. DES E. 3DES. DES and 3DES are symmetric block ciphers that both operate on 64-bit block sizes, distinguishing them from AES which uses a 128-bit block size.
Question
Which of the following are restricted to 64-bit block sizes? (Select TWO).
Options
- APGP
- BDES
- CAES256
- DRSA
- E3DES
- FAES
How the community answered
(54 responses)- B87% (47)
- C7% (4)
- D4% (2)
- F2% (1)
Why each option
DES and 3DES are symmetric block ciphers that both operate on 64-bit block sizes, distinguishing them from AES which uses a 128-bit block size.
PGP (Pretty Good Privacy) is an encryption program and standard, not a block cipher with a defined block size.
DES (Data Encryption Standard) encrypts data in 64-bit blocks using a 56-bit key, making it one of the original 64-bit block ciphers.
AES256 refers to AES with a 256-bit key; AES uses a 128-bit block size regardless of key length.
RSA is an asymmetric (public-key) algorithm that does not use fixed block sizes in the same way as symmetric block ciphers.
3DES (Triple DES) applies DES encryption three times to each 64-bit block, inheriting the 64-bit block size from DES while improving key strength.
AES (Advanced Encryption Standard) uses a 128-bit block size for all key lengths (128, 192, or 256 bits).
Concept tested: DES and 3DES 64-bit block size characteristic
Source: https://csrc.nist.gov/publications/detail/fips/46/3/archive/1999-10-25
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