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Block Cipher (modes (Electronic Codebook (each block separate, no IV,…
Block Cipher
modes
increases security :lock:
Electronic Codebook
each block separate
no IV
break one, break all
Cipher Block Chaining
xor plain with previous cipher block
needs good IV
Output Feedback
generates a keystream
keystream XOR plaintext
Counter
key stream
encryption+authentication
Counter w/ CBC-MAC
Galois Counter
block size
128 bit (current)
fixed
attacks
known-plaintext