S-box

♦ Chiper Product: 12 bit plaintext diubah susunannya oleh P-box kemudian dipecah ke dalam 4 kelompok S-box, dst. hinggga dihasilkan 12 bit chipertext.

Recently Uploaded Slideshows Mrirfan 2010

♦ Substitusi (S-box): pada gb. substitusi diperoleh dengan memasukkan 3 bit plaintext ke decoder 3x8, masuk ke P-box, kemudian encoder 8x3 sehingga diperoleh 3 bit chipertext.

Recently Uploaded Slideshows Mrirfan 2010

♦ Ri-1 dan kunci Ki diproses XOR: B = Ri-1 ⊕ Ki ♦ kemudian masuk ke S-box dan P-box → {0,1} 32 lih.hlm. berikut

Recently Uploaded Slideshows Mrirfan 2010

♦ Substitusi (S-box): pada gb. substitusi diperoleh dengan memasukkan 3 bit plaintext ke decoder 3x8, masuk ke P-box, kemudian encoder 8x3 sehingga diperoleh 3 bit chipertext.

Recently Uploaded Slideshows Mrirfan 2010

♦ Chiper Product: 12 bit plaintext diubah susunannya oleh P-box kemudian dipecah ke dalam 4 kelompok S-box, dst. hinggga dihasilkan 12 bit chipertext.

Recently Uploaded Slideshows Mrirfan 2010

♦ Ri-1 dan kunci Ki diproses XOR: B = Ri-1 ⊕ Ki ♦ kemudian masuk ke S-box dan P-box → {0,1} 32 lih.hlm. berikut

Recently Uploaded Slideshows Mrirfan 2010

However, the P-layer ensures that the output of one S-box in one round will affect several in the next round so, after a few rounds, overall avalanche properties can be very good.

Citizendium, the Citizens' Compendium - Recent changes [en] 2008

A single round of an SP network does not usually provide good avalanche properties; output bits are affected only by inputs to their S-box. not by all input bits.

Citizendium, the Citizens' Compendium - Recent changes [en] 2008

The S-box output then replaces that part so the combined S-box outputs become the S-layer output.

Citizendium, the Citizens' Compendium - Recent changes [en] 2008

The permutation ensures rapid avalanche; a one-bit change in key affects one S-box; a one-bit change in the input block affects one or two S-boxes.

Citizendium, the Citizens' Compendium - Recent changes [en] 2008