terms Flashcards
1
Q
Substitution
A
replaces symbols
2
Q
Codes
A
replace words
3
Q
ciphers
A
replace letters
4
Q
transposition
A
rearranges symbols
5
Q
Confusion
A
Obscure the relationship between input, output, and key. This is usually done by substitution
6
Q
Diffusion
A
Spread out the influence of bits of input. Usually done by permutation or transposition.
7
Q
TCP exploits: types of scans
A
SYN Scan
FIN scan
ACK scan - a way to defeat firewalls
8
Q
TCP connect
A
go through whole connection
9
Q
SYN Scan
A
2/3 of handshake. As soon as target responds with SYN-ACK , RESET. Less likely to be detected by servers. May results in SYN flood.
10
Q
FIN scan
A
teardown nonexistent connections
Open ports don’t respond
Closed port send a RESET
11
Q
ACK scans
A
if the firewall allows ACK packets without keeping session info, then an easy exploit
