Question: Suppose Alice and Bob are using a shared secret key encryption algorithm in which the cost to do encryption and decryption is linear in the

Suppose Alice and Bob are using a shared secret key encryption algorithm in which the cost to do encryption and decryption is linear in the length of the key. Suppose they decide to start using

256 -

bit keys instead of

128 -

bit keys. How much longer will encryption and decryption take them?

Now suppose evil Trudy is doing brute

-

force search to decrypt Alice and Bob

s conversation. How much more computation will Trudy need to use with

256 -

bit keys than when they were using

128 -

bit keys?

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