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`MII` for RSA private keys.

MII is not RSA, it's an opening header of asn1 structure encoded to DER -- 30 82 0x which is basically "{" when which can be pretty much anything from x509 certificate to private keys fro ECDSA.

Actual RSA oid is somewhere in the middle.

True, but for the most part, RSA keys are the only keys that anyone encounters that start with long SEQUENCEs requiring two-byte lengths.

`eY` could be any JSON, but it's most likely going to be a JWT.

Neither is a perfect signal, but contextually is more likely correct than not.

That depends on the kind of abyss you are staring into. Mine had plenty of non-RSA keys, certificates (which are of course two-byte length all the time) and CMS containers.

IMO depends on your career. I did a lot of pentesting with Burp Suite so I was able to (forced to) pick it up.

Probably is, but I still found it to be a fun tidbit.

I work with this stuff often enough to recognize something that looks like a key or a hash. I don't work with it often enough to have picked up `ey` and `LS`.

I thought so too, but xkcd 1053 / lucky 10000, I guess! I knew about ey but not LS