Question: The widely used algorithm 3 DES is a triple composition of DES and has a security level of 1 1 2 bits. Why did cryptographers

The widely used algorithm

3

DES is a triple composition of DES and has a security level of

112

bits. Why did cryptographers not try

2

DES

(

a double composition

)

with two independent

56

bit keys, for a total key length of

112

bits? In your answer please make clear that you know the difference between key length and security level. Be sure to explicitly define what "bits of security" means in cryptography.

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