- MAC = message authentication code
- PT = plaintext
- CT = ciphered text
- Fully secure only if the key is as long as the input (5TB data needs 5TB key)
- physical process (thermal noise, …) - aperiodic, slow
- sw function - periodic and fast
- initialized by seed - fully determines all random data
- Every output bit should depend on every input bit in complex way
- EFF - Electronic Foundation
- ECB = electronic code block
- CBC = cipher block chaining
- blocks with the same data wont result in same encrypted data
- CRT = counter mode