signify-openbsd 28-1 (arm64 binary) in ubuntu focal

 Similar to GNU Privacy Guard (GPG), signify is the tool which
 OpenBSD uses to cryptographically sign its releases, so that
 you can be sure that you are actually getting a release made by
 OpenBSD, as opposed to a malicious forgery designed to look
 the same.
 .
 Signify's usage is not limited to OpenBSD's releases, however -
 it can be used to sign anything.
 .
 So that it will work on Linux, the version of signify provided
 in this package is not exactly the same as the version provided
 in OpenBSD's CVS tree.
 .
 Please note that OpenBSD's public keys are not included with
 this package; you will have to find your own version in order
 to verify their releases.