The full title is:

> National Security Agency (NSA) paper: Fifty Years of Mathematical Cryptanalysis (1937-1987), 1988

For context [1][2]:

> Weirdly, this is the second time the NSA has declassified the document. John Young got a copy in 2019. This one has a few less redactions. And nothing that was provided in 2019 was redacted here.

[1] https://www.schneier.com/blog/archives/2025/05/the-nsas-fift...

[2] https://archive.org/details/NSAFiftyYearsOfMathematicalCrypt...

Why did they bother releasing this document—and twice at that? It is so redacted as to be both worthless and an annoyance.