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

Nova 10.4 Checksum

The SHA256 checksum of the Nova 10.4.zip archive, available at https://download.panic.com/nova/Nova 10.4.zip is:

54949122b3c8d571eb84d49c387f6998c18c730c7383cc7478845c36cd4488e1

Validating the Checksum

1. Download Nova 10.4.zip
2. Run the following command in Terminal to compute the checksum of your copy:

$ shasum -a 256 ~/Downloads/Nova\ 10.4.zip

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

54949122b3c8d571eb84d49c387f6998c18c730c7383cc7478845c36cd4488e1  /Users/panic/Downloads/Nova 10.4.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 10.4.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 10.4 Checksum Signature

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

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

54949122b3c8d571eb84d49c387f6998c18c730c7383cc7478845c36cd4488e1
-----BEGIN PGP SIGNATURE-----

iQEzBAEBCgAdFiEE6i1R0iW3pPNCW77Iq26O7ibMLj0FAmOI8FwACgkQq26O7ibM
Lj2BbAf+KDe8P43h5zWng9+ACNZDJqL24sTAW6G/fBvxMwjGG+aB9HHO0pSXJCBh
pr3L/7Ic6lWEHTPyoM/lPMwI/crMIH8YWeu2NQ4Tkxnmnb9TzUTfkohUap1XZG1O
FPwsExkXtZAsNz6freztMwxMegEcWq1SBEHb/FUuJdBUhZ4G6ZGBd88UPQw+kzd2
nS2XxzmhTSp9H9CQ5YDzUlLKvBfMkIePbfD92mHXlvro23hm2Diweq4kLlFGGO+H
8ytKqRnHzUV6aH5CfkctYVNtRsArdA92mh5KITy9iPNm21TuoMak4rasOQqgj73q
oQOYZ2Y04noaHZhFoBoLp7VVwzzQTg==
=0jXp
-----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:

54949122b3c8d571eb84d49c387f6998c18c730c7383cc7478845c36cd4488e1

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 10.4.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.