All Questions
4 questions
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Can we design a block cipher based on SP-network without loss of E/D similarity theoretically?
I understand what SP-network (Substitution-Permutation Network) and Feistel Network look like. And those ciphers based on Feistel (e.g. DES) often achieve so called E/D similarity, which indicates ...
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2
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1
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DES/AES invertibility
My professor has posted a couple of practice questions that so far I haven't been able to find the answer for and I was hoping you could help.
DES would remain invertible—it would still be ...
user3712347
17
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3
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Why is AES not a Feistel cipher?
I am studying for an exam right now. And I wanted to make sure I got this point correct.
AES is not a Feistel cipher because the operations in AES are not invertible.
Is the above statement correct?...
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5
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Increase number of rounds for SPN and Feistel ciphers
Read a post on Schneiers blog (and again 2011) about increasing the number of rounds for AES from to "AES-128 at 16 rounds, AES-192 at 20 rounds, and AES-256 at 28 rounds" to raise the security. ...
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