35364
Crypto U2,
Crypto design
principles
- large keyspace is necessary
- possible to break
cryptosystem without
first determining the key
- cryptosystem designers must
worry about more than the key
- cryptosystem designers must
worry about more than the key
- effective
techniques for
disguising plaintext
- increase
alphabet sizes
- ensure that each
plaintext letter
encrypts to a
variety of
different
ciphertext
"letters"
- introduce
positional
dependency
- increase
alphabet sizes
- always a tradeoff
between efficiency and
security
- can design for attacks that we
know already, but keep watch for
new attacks and adapt as needed
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