For Mac OS/X: Please follow these instructions.
- Download and install OpenJDK 11 for Mac OS/X (If you don't have Java 11 already).
- Extract the
.tar.gzfile. The result should be an app namedjcryptoolorjcryptool.app. - Execute the following commands — assuming you extracted JCrypTool directly in the folder "Downloads"; otherwise, adapt the command accordingly to match the folder the app is in.
sudo xattr -r -d com.apple.quarantine ~/Downloads/jcryptool.app