Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ntughari: N'inye ntinye 6-bit, a na-achọta mmepụta 4-bit site na ịhọrọ ahịrị site na iji mpụga abụọ (bit mbụ na nke ikpeazụ), na kọlụm site na iji bit anọ dị n'ime. Dịka ọmụmaatụ, ntinye "011011" nwere mpụga bit "01" na n'ime bit "1101"; mmepụta kwekọrọ na ya ga-abụ "1001". Igbe S 8 nke DES bụ isiokwu nke ọmụmụ kpụ ọkụ n'ọnụ ruo ọtụtụ afọ n'ihi nchegbu na a ga-akụdo ụzọ azụ <unk> adịghị ike nke naanị ndị na-emepụta ya maara <unk> n'ime cipher. E mechara bipụta ụkpụrụ S-igbe (na Coppersmith 1994) mgbe ọha na eze nwetaghachiri nkewa cryptanalysis, na-egosi na a na-ahazi ha nke ọma iji mee ka nguzogide megide mwakpo a. Biham na Shamir chọpụtara na ọbụlagodi obere mgbanwe na S-igbe nwere ike belata DES. Enweela ọtụtụ nnyocha na imewe nke ezigbo S-igbe, na ọtụtụ ihe a ghọtara banyere ojiji ha na ngọngọ ciphers karịa mgbe a tọhapụrụ DES. S-igbe ọ bụla ebe a na-emepụta bit ọpụpụ ọ bụla site na ọrụ gbagọrọ agbagọ nke ntinye ntinye, na ebe njikọta ọ bụla nke ntinye ntinye bụkwa ọrụ gbagọrọ agbagọ nke ntinye ntinye, bụ S-igbe zuru oke.  Ajụjụ: Olee otu ị ga-esi chọta mmepụta 4-bit?
ahọpụta ahịrị site na iji mpụga abụọ bits (nke mbụ na nke ikpeazụ bits), na kọlụm site na iji n'ime anọ bit