Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: Ko nga putake o DES ka hoki ki te timatanga o nga tau 1970. I te tau 1972, i muri i te whakaoti i tētahi rangahau mō ngā hiahia haumarutanga rorohiko o te kāwanatanga o Amerika, ka kitea e te rōpū paerewa o Amerika NBS (National Bureau of Standards) - kua tapaina nei ko NIST (National Institute of Standards and Technology) - he hiahia mō tētahi paerewa whānui-kāwanatanga mō te whakamunatanga o ngā mōhiohio tūmataiti, mōhiohio tairongo. I runga i tenei, i te 15 o Mei 1973, i muri i te korero ki te NSA, i tono a NBS i nga tono mo tetahi tohu e tutuki ana i nga paerewa hoahoa. Heoi, kaore tetahi o nga tono i puta he pai. I tukuna he tono tuarua i te 27 o Akuhata 1974. I tēnei wā, i tukuna e IBM tētahi kaitono i whakaaetia hei whakaaetanga - he tohu i hangaia i te wā 1973-1974 i runga i tētahi hātepe o mua, te tohu Lucifer a Horst Feistel. Ko te roopu i IBM e uru ana ki te hoahoa me te wetewete i te tohu ko Feistel, Walter Tuchman, Don Coppersmith, Alan Konheim, Carl Meyer, Mike Matyas, Roy Adler, Edna Grossman, Bill Notz, Lynn Smith, me Bryant Tuckerman.  Pātai: He aha te wā i tīmata ai te DES?
tīmatanga o te tekau tau 1970