MODULE 2 Flashcards
1
Q
Symmetric encryption ingredients:
A
- Plaintext
- Encryption algorithm
- Secret key
- Ciphertext
- Decryption algorithm
2
Q
Cryptanalysis types of attacks:
A
- Ciphertext only
- Known plaintext
- Chosen plaintext
- Chosen ciphertext
- Chosen text
2
Q
Encryption is computationally secure if:
A
- Cost of breaking cipher exceeds info value
- Time to break cipher exceeds info useful lifetime
3
Q
Feistel cipher design features:
A
- Block size
- Key size
- Number of rounds
- Ease of analysis
- Function
- Fast encryption/decryption
- Subkey generation algorithm
4
Q
AES:
A
An encryption standard that processes a block as a matrix each round
5
Q
Design considerations for stream ciphers:
A
- Encryption sequence must have a large period
- Keystream approximate true random number
- A key length of at least 128 bits is desirable
5
Q
RC4:
A
A stream cipher with variable key size and byte-oriented operations for random permutations
6
Q
WEP stands for _____
A
Wired Equivalent Privacy
7
Q
WPA stands for _____
A
Wi-Fi Protected Access
8
Q
ECB stands for _____
A
Electronic Codebook
8
Q
RC4’s practical uses:
A
- SSL/TLS
- WEP/WPA
9
Q
CBC stands for _____
A
Cipher Block Chaining
10
Q
CFB stands for _____
A
Cipher Feedback
10
Q
CTR stands for _____
A
Counter
11
Q
OFB stands for _____
A
Output Feedback
