Which of the following algorithms uses three different keys to encrypt the plain text?
A. Skipjack
B. 3DES
C. Blowfish
D. AES
正解:B
解説: (Pass4Test メンバーにのみ表示されます)
質問 2:
What is Kerchoff's principle?
A. A minimum key size of 256 bits is necessary for security
B. Only the key needs to be secret, not the actual algorithm
C. A minimum of 15 rounds is needed for a Feistel cipher to be secure
D. Both algorithm and key should be kept secret
正解:B
解説: (Pass4Test メンバーにのみ表示されます)
質問 3:
What is the largest key size that AES can use?
A. 128
B. 56
C. 512
D. 256
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4:
Modern symmetric ciphers all make use of one or more s-boxes. Both Feistel and non-Feistel ciphers use these s-boxes. What is an s-box?
A. Another name for the round function
B. A black box for the algorithm implementation
C. A substitution box where input bits are replaced
D. A shifting box where input bits are shifted
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
質問 5:
The time and effort required to break a security measure.
A. Work factor
B. Payload
C. Non-repudiation
D. Session Key
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 6:
In IPSec, if the VPN is a gateway-gateway or a host-gateway, then which one of the following is true?
A. Only transport mode can be used
B. Encapsulating Security Payload (ESP) authentication must be used
C. IPSec does not involve gateways
D. Only the tunnel mode can be used
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 7:
Which of the following uses an 80 bit key on 64 bit blocks?
A. Skipjack
B. Twofish
C. DES
D. AES
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 8:
A symmetric Stream Cipher published by the German engineering firm Seimans in 1993. A software based stream cipher that uses a Lagged Fibonacci generator along with concepts borrowed from shrinking generator ciphers.
A. Twofish
B. DESX
C. IDEA
D. FISH
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 9:
John is trying to select the appropriate authentication protocol for his company. Which of the following types of authentication solutions use tickets to provide access to various resources from a central location?
A. EAP
B. Radius
C. CHAP
D. Kerberos
正解:D
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