[Cryptography] Correction: the Joseph Meyer letter is dated 1977, not 1997

[John Young]

Correction: the Joseph Meyer ex-Top Secret Umbra letter is dated 
1977, not 1997, as the NSA cover letter states.

<https://t.co/Z9iws1q55Y?amp=1>https://cryptome.org/2021/04/Joseph-Meyer-IEEE-1977.pdf 
(8MB)

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