This article contains details on validating the origin and integrity of the latest version of Nova

Nova 13 Checksum

The SHA256 checksum of the Nova 13.zip archive, available at https://download.panic.com/nova/Nova 13.zip is:

c3f018cad3c03f1cc21ec6f54ec4631b2bd06129b74ac718bca3d19116d812ef

Validating the Checksum

1. Download Nova 13.zip
2. Run the following command in Terminal to compute the checksum of your copy:

$ shasum -a 256 ~/Downloads/Nova\ 13.zip

If the hash portion of the command output matches the checksum above:

c3f018cad3c03f1cc21ec6f54ec4631b2bd06129b74ac718bca3d19116d812ef  /Users/panic/Downloads/Nova 13.zip

you can be sure that your copy of the download is identical to the version on our website.

Unfortunately, validating the checksum alone does not guarantee that the contents of Nova 13.zip haven’t changed since we posted it*. However, with one extra step you can also determine with certainty that the checksum above, and therefore the contents of the ZIP, originated from Panic.

*Why not? In the very unlikely circumstance that a malicious actor replaced the ZIP archive on our website and modified the contents of this article using a new SHA256 hash, the checksum could still validate.

Nova 13 Checksum Signature

Using our public key, we have PGP-signed the SHA256 checksum from above:

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

c3f018cad3c03f1cc21ec6f54ec4631b2bd06129b74ac718bca3d19116d812ef
-----BEGIN PGP SIGNATURE-----

iQEzBAEBCgAdFiEE6i1R0iW3pPNCW77Iq26O7ibMLj0FAmhjE7IACgkQq26O7ibM
Lj0ILgf/dpCIjB7v/xbXbYQJjLzKSsiNbNw8isXFOBg0DDabsF7J4ZUNc2qkaXl8
ov7bEn7V9PwmXqGs+a9ySET/O7IId5cmWCthr6Go7c8cIrvn7opsJ5vgmdBs4lRT
7QTaUkB4d7wLXcH8sLPmHEFLm3uOCv2MP9y1tCzUBe/5fVftsEBZEBAkQ+f0EhL0
G8A8uHactUy/jikEiwaFQl54F6GmPx4SaGMWbliewh6PCZU/tCn8uueqZZDoimJ3
EXM/rdx+OCRfNCAYXLCYFmJyON+WU95uh0lfshBupQHNmIRdZKpHEarMi6SGSl9d
/wkVzsPzJTaR//5T8RGOxt+qHjFzXQ==
=UVaI
-----END PGP SIGNATURE-----

Validating the Signature

1. Follow these instructions to install GnuPG
2. Open your terminal
3. Copy the entire PGP message above, including -----BEGIN PGP MESSAGE----- and -----END PGP MESSAGE-----
4. Use the echo "<message" | gpg --verify - command to verify the PGP message copied above

Most importantly, GnuPG should indicate that the message was signed by Panic:

Additionally, the resulting Signed Text should match our original checksum:

c3f018cad3c03f1cc21ec6f54ec4631b2bd06129b74ac718bca3d19116d812ef

If both items match, you can be sure that the checksum in this article originated from Panic.

Putting it all together

By using two factors of validation:

• A checksum which ensures that your copy of Nova 13.zip is identical to the copy on our website
• A PGP signature which ensures that the checksum originated from Panic

you can be sure that you are installing the release that we originally posted.

Support

We are more than happy to answer questions or help provide any guidance you might need to validate the checksum and signature for this release. Please email us, nova@panic.com.