N'afọ 1972, mgbe ha mechara nnyocha banyere mkpa nchekwa kọmputa nke gọọmentị US, ụlọ ọrụ na-ahụ maka ọkọlọtọ nke US bụ NBS (National Bureau of Standards) <unk> ugbu a aha ya bụ NIST (National Institute of Standards and Technology) <unk> chọpụtara mkpa ọ dị maka ọkọlọtọ gọọmentị zuru ụwa ọnụ maka izochi ihe nzuzo, ihe ọmụma dị nro. N'ihi ya, na May 15, 1973, mgbe ha nyochachara ya na NSA, NBS rịọrọ arịrịọ maka koodu nke ga-ezute njirisi nhazi siri ike. Otú ọ dị, ọ dịghị nke ọ bụla n'ime ntinye akwụkwọ ndị ahụ dabara adaba. E nyere arịrịọ nke abụọ na August 27, 1974. Oge a, IBM nyere onye na-aga ime nke a na-ewere dị ka ihe a na-anabata <unk> koodu nke e mepụtara n'oge 1973-1974 dabere na algorithm mbụ, Feistel Horst's Lucifer.
mbido afọ 1970