This doesn’t make sense. The NSA has certified lots of crypto protocols that we use.
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These days it seems those protocols are used in spite of NSA involvement. See what happened with Speck in the Linux kernel. https://lwn.net/Articles/761992/
Seriously? As soon as the NSA certifies a piece of code it'll be dropped like a hot potato by everyone outside of the US, and probably by a large percentage of the people inside it.
If such a body exists, which seems like a reasonable idea, it has to be nongovernmental and not controlled by large corporations either.