to the passage below and then answer the question afterwards in the same language as the passage: Passage: The origins of DES go back to the early 1970s. In 1972, after concluding a study on the US government's computer security needs, the US standards body NBS (National Bureau of Standards) <unk>now named NIST (National Institute of Standards and Technology) <unk>identified a need for a government-wide standard for encrypting unclassified, sensitive information. accordingly, on 15 May 1973, after consulting with the NSA, NBS solicited proposals for a cipher that would meet rigorous design criteria. none of the submissions, however, turned out to be suitable. a second request was issued on 27 August 1974. this time, IBM submitted a candidate which was deemed acceptable<unk>a cipher developed during the 19731974 period<unk> based on an earlier algorithm, Feistel Horst's Lucifer involved DES. The team at IBM included Walter Feistelman, Walter Copperman, Bill Smith, Roy Bryant, Don Bryant, Roy Adler, Brian Grossman, and Mike Adler.
ìbẹ̀rẹ̀ ọdún 1970