All Questions
Tagged with spn feistel-network
7 questions
17
votes
3
answers
21k
views
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?...
- 273
6
votes
2
answers
7k
views
What is the diffrence between Feistel networks and SPN?
I recently read about the concept of Feistel Networks and Substitution Permutation Networks but what is exactly the difference between the two ?
- 581
5
votes
1
answer
1k
views
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. ...
- 63
4
votes
1
answer
248
views
Using a round function intended for an SP network in a Feistel network?
If I use the round function from a secure SP network (such as AES) and use it in a Feistel netwok, is this a good starting point for the second cipher?
My thought is "yes" because:
it already has ...
- 4,813
3
votes
2
answers
161
views
Would there be any advantage in combining Feistel network and substitution-permutation network in a single cipher?
One common way to design invertible block ciphers is using a Feistel network used in for example DES and Blowfish. Another common way is a substitution-permutation network used in for example Rijndael ...
- 1,623
2
votes
1
answer
1k
views
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
0
votes
1
answer
164
views
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 ...
- 165