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I remember looking at SSH public key fingerprints in Savannah at the time and wondering why SO MANY started with AAAA (thought it was some padding first...)

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The AAAA (and several of the following characters) is just a header showing what type of key it is: https://crypto.stackexchange.com/questions/5944/why-do-all-s...

That's the header on the public key itself; the fingerprint GP referred to doesn't have a "header".

The broken keys didn't all have fingerprints of AAAA either.

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