1
vote
1answer
91 views

Does the key schedule function need to be a one-way function?

For some key schedule $e_n(e_{n-1}(k))$ (where $e_{n-1}(k)$ is the result of the previous round) , does $e$ need to be a one-way function? In the case of DES or Rijndael the key schedule doesn't ...
5
votes
2answers
448 views

why DES uses exactly 16 rounds?

Why DES uses 16 rounds why not more or less then 16. what is the significant of using 16.