Five Generations of NSA Encryption
The large number of encryption systems that NSA has developed in its half century of operation can be grouped into five generations (decades given are very approximate):
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“The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done; men and women who are creative, inventive and discoverers, who can be critical and verify, and not accept, everything they are offered.”
—Jean Piaget (1896–1980)