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

Nova 9.3 Checksum

The SHA256 checksum of the Nova 9.3.zip archive, available at https://download.panic.com/nova/Nova 9.3.zip is:

682e78d38ad3043a27b292721539a9446ed3363993d3374c62b82b79818a83e4

Validating the Checksum

1. Download Nova 9.3.zip
2. Run the following command in Terminal to compute the checksum of your copy:

$ shasum -a 256 ~/Downloads/Nova\ 9.3.zip

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

682e78d38ad3043a27b292721539a9446ed3363993d3374c62b82b79818a83e4  /Users/panic/Downloads/Nova 9.3.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 9.3.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 9.3 Checksum Signature

Using our public profile on Keybase, we have PGP-signed the SHA256 checksum from above:

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

682e78d38ad3043a27b292721539a9446ed3363993d3374c62b82b79818a83e4
-----BEGIN PGP SIGNATURE-----

iQEzBAEBCgAdFiEE6i1R0iW3pPNCW77Iq26O7ibMLj0FAmJYesUACgkQq26O7ibM
Lj26SQgAgIZFBQIs3o6U/L/bG9XLed5v0+0JQXhFJVwB2KErUO2prSu5ZwBUKRtz
DvWfxJI0dLEKDHit0B29o1ITIJARDj14ilqvNGTjVM2PAlhJmCV9KD2nZGDqb4bQ
h2MHSGxQeWayk7/99NSg8fQIicio47L5qqGs/eGgUCZOrAlrc3ziLbYuR0X0m+jE
BZKJZIIan7RtSOWocKxYX5vKKnh1hME7o2uV9RoriryS9jKNEKK7fVsDnKYlnE7k
UNrNzSH6xbC3m/MahG0P1qS0H8he7SYE9tt2jCUoSjRf2cnjN6isBf7+gSUYmjez
OdjkAfdJLucV8qynFQ9Qjui/2lVTTg==
=YK+G
-----END PGP SIGNATURE-----

Validating the Signature

1. Copy the entire PGP message above, including -----BEGIN PGP MESSAGE----- and -----END PGP MESSAGE-----
2. Paste the contents into the Message to verify box on Keybase
3. Click Verify

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

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

682e78d38ad3043a27b292721539a9446ed3363993d3374c62b82b79818a83e4

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 9.3.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.