On Keybase.io and encrypted private key uploading

One thing in particular of Keybase.io attracts a lot heat recently: they support uploading your encrypted key on their servers. This usually is pointed at as a mortal sin.

Well, here is my private key, the untouched output of gpg --armor --export-secret-keys filippo.io | gpg --armor --clearsign.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

- -----BEGIN PGP PRIVATE KEY BLOCK-----
Version: GnuPG v1

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A2SG4sC5bTyjwkoUA4uNOBedh37+cXcKHCG4aPVHSjlzWvEyuQxYsoUIMQZYcQB5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=ROzK
- -----END PGP PRIVATE KEY BLOCK-----
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBCgAGBQJTOcOhAAoJECBNgkAQH1IWD5gH/2lGtDIu3d5GWA+GRRc1mL1I
FA1w2jdB1m4RGDgQWi7xX38cx0/8J8b+OzYKxC0pYezoKBmWMEa/xCdKIwrDLcBg
bx89qYgbeyJYY3B0PrVMBa2NdkNr8J1RXv+GVOUpkhJiVJY9OSJKmjDbVnpL5jEZ
3+j3DXK+5c56LdsWAQ5x5ZPyDWL6vEAUTxwL89Uy7GQSmeA7yh2j+xrjd2wBgAzq
FC/2wKJZYDLLuFFqMwi8fsX1vfsll/eAlb++vbel4pdunqqG4eW0C69jqe+RMyNK
1+YkPzGAJf7KWMcYzk9bzpFBEHmNh+0ZWiXkfrOsOw+vQjHJbXN8wE5pszBD0og=
=2qD5
-----END PGP SIGNATURE-----

What you have now on me is what Keybase would have on anyone that uploaded their private key, and this is not even TripleSec'd, is just my very own, signed by many people, regular PGP key as it lives password protected on my laptop. And now on my blog. (Isn't it Backup Day or something?)

If this is indeed dangerous you will shortly see messages signed by me saying that I stink, and immediately after me waving revocation certificates in the air. But it's not going to happen, because decrypting the above is arguably as difficult as computing my secret key from the public one.

The sensible argument

There is however a more informed point that is made against uploading your key: "what if they start serving a keylogger on their site?"

However here the issue is not having uploaded the private key to the Keybase servers but using the in-browser client. If the server turns malicious and you are doing crypto in the browser, you are pwn'd, otherwise you are not.

Let's look at the threat models.

Keybase is compromised; you use the website to do crypto

The attacker does not need to upload any keylogger, they just modify the code to catch your decrypted private key while you use it and send it hidden in the next upload. The End.

Keybase is compromised; you use the CLI client (uncompromised)

Here the attacker has only an encryption of the private key as the one above, you keep using your client happily and when he desperately upload a keylogger to the site you just go like "WTF!? I don't do crypto in the browser, why is it asking me some password? MAX!"

The CLI client is compromised

Goodbye. Your computer is compromised, don't even try. But this holds true of any tool, even the very GnuPG.