To check that you have downloaded a legitimate version of Kryptor, you should verify the signatures provided on the Downloads page.
You can download my public key here.
Fingerprint = 8E1ABC56B1DDB353EA7A47186362459399B0E317
Note that you must remove the square brackets when running the commands. E.g. gpg --verify KryptorCLI-Linux.zip.sig KryptorCLI-Linux.zip
GnuPG should display the message 'Good signature'. If you don't see this message, then your Kryptor download is not legitimate and may be unsafe.