DES Modes Flashcards
1
Q
ECB - Electronic Code Book
A
- simplest & least secure
- 64 bit blocks processed
- same block –> same encrypted block –> easy to break
2
Q
CBC - Cipher Block Chaining
A
- each block of plain text is XORed
- with previous block of cipher text
- reverses XOR operation
3
Q
CFB - Cipher Feedback
A
- streaming version of CBC
- real time
- memory buffers of same block size
- when data is full: encrypted + transmitted
- uses chaining –> more errors
4
Q
OFB - Output Feedback
A
- operates similar to CFV, but XORs with seed value
- no chaining –> less errors
5
Q
CTR - Counter
A
- incrementing counter instead of seed
- errors doe not propagate
