Talk:S-box

This page does not agree with the page on Confusion and Diffusion. While that page associates diffusion with dissipating the relationship between a plaintext and a ciphertext (as here), substitution is there considered to be a component of confusion not diffusion. IMHO the first paragraph here needs to be reworked. Dvunkannon (talk) 20:44, 21 November 2007 (UTC)

hashes

Note that for some hashes (like the simple s-box hash) the s-box is also an important technique in hashes to increase the avalanche achievement behaviour of relatively simple algorithms. —Preceding unsigned comment added by 213.61.9.74 (talk) 12:29, 26 January 2011 (UTC)

Cache timing attacks against S-boxes

djb wrote an interesting paper about cache timing available here. While the paper focuses on AES, the attack is applicable against most encryption algorithm using large S-boxes. —Preceding unsigned comment added by 24.1.63.132 (talk • contribs)

Expansion

This article needs expansion. It doesn't talk much about what a S-box is, or how it works, at all. I'd expand it, but I don't know myself. Surgo 05:32, 20 November 2005 (UTC)

I second this. 68.126.192.237 06:01, 30 October 2006 (UTC)

Title should be S-box

The "S" may stand for "substitution" but no-one ever talks about a "substitution box", only an "S-box". If we're to follow the terminology used in the field, we should title this appropriately. — ciphergoth 18:02, 25 November 2008 (UTC)

The answer for "Corresponding Output.." ?

Looks to have been updated. Thank you. Brifish (talk) 07:21, 7 November 2012 (UTC)

DES S-box size

What's the meaning of "6×4-bit"? It's neither 6 4-bit boxes, nor 6×4 = 24-bit boxes. Shouldn't it be on of the following?

• 4×2-bit
• 16×4
• 2^6×4 = 64×4-bit — Preceding unsigned comment added by 2A02:8070:A193:9601:7CFD:6A43:B3D9:5DF (talk) 17:09, 2 November 2014 (UTC)

I agree, it's confusing. The only way it makes sense is to read it as a 6-bit input (there are 2⁶ boxes) mapped into a 4-bit output, so 2⁶×4 bits total. I'll change it. -- intgr [talk] 19:34, 13 November 2014 (UTC)

Not that the current text is wrong, but the notation "m×n S-box" is introduced right in the preceding paragraph. 92.10.41.178 (talk) 23:21, 2 April 2016 (UTC)