Cryptography S-box size, use of multiple s-boxes |
- S-box size, use of multiple s-boxes
- Multiple encryption?
- [History] Cracking a medieval code
- Is this encryption enough for my personal files?
S-box size, use of multiple s-boxes Posted: 23 Mar 2018 09:10 PM PDT I've been looking at various s-box implementations and have noticed that 8 and 4 bit sboxes are relatively common in block ciphers. Of course there is an increased memory/performance cost the larger the sbox. I found a paper proposing a 16 bit sbox filled much the same way as AES's sbox and it got me thinking, what are the strength advantages to using a larger sbox over a smaller one? Does it just increase diffusion and reduce the number of rounds required vs a smaller sbox or are there other cryptographic advantages (ignoring speed/cost)? My next question is, would using multiple sboxes either by adding a second sbox step within the round schedule, or selecting the sbox each round from multiple options) ruin the carefully planned design of an sbox? Ie. is it critical to only have one sbox in use for it to be most effective at resisting attacks like differential cryptanalysis? [link] [comments] |
Posted: 24 Mar 2018 02:12 AM PDT I'm a 16 year old who's interested in cryptography. So why don't we encrypt a file then encrypt it again with a separate algorithm? Like for example first AES then blowfish? Please explain it in layman's terms as I couldn't find an article online in simple terms. [link] [comments] |
[History] Cracking a medieval code Posted: 23 Mar 2018 03:39 AM PDT |
Is this encryption enough for my personal files? Posted: 23 Mar 2018 02:50 PM PDT I've finally finished coding the command line app to encrypt my files before uploading them to the cloud. [link] [comments] |
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