2 cissp ® Official Study Guide Eighth Edition

15.
How many keys are required to fully implement a symmetric algorithm with
10 participants?
A.
10
B.
20
C.
45
D.
100
16.
What block size is used by the Advanced Encryption Standard?
A.
32 bits
B.
64 bits
C.
128 bits
D.
Variable
17.
What kind of attack makes the Caesar cipher virtually unusable?
A.
Meet-in-the-middle attack
B.
Escrow attack
C.
Frequency analysis attack
D.
Transposition attack
18.
What type of cryptosystem commonly makes use of a passage from a well-known book for 
the encryption key?
A.
Vernam cipher
B.
Running key cipher
C.
Skipjack cipher
D.
Twofish cipher

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Review Questions 
235
19.
Which AES finalist makes use of prewhitening and postwhitening techniques?
A.
Rijndael
B.
Twofish
C.
Blowfish
D.
Skipjack
20.
How many encryption keys are required to fully implement an asymmetric algorithm with 
10 participants?
A.
10
B.
20
C.
45
D.
100

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PKI and 
Cryptographic 
Applications
The CISSP exAm ToPICS Covered In 
ThIS ChAPTer InClude:
✓
Domain 3: Security Architecture and Engineering
■
3.9 Apply cryptography
■
3.9.1 Cryptographic lifecycle (e.g., key management,
algorithm selection)
■
3.9.2 Cryptographic methods
■
3.9.3 Public Key Infrastructure (PKI)
■
3.9.4 Key management practices
■
3.9.5 Digital signatures
■
3.9.6 Nonrepudiation
■
3.9.7 Integrity
■
3.9.8 Understand methods of cryptanalytic attacks
■
3.9.9 Digital Rights Management (DRM)