1Windows
Gpg4win installs GnuPG together with Kleopatra, a graphical key manager suitable for beginners.
2macOS
GPG Suite adds key management and integrates with the system clipboard for quick verification.
3Linux
GnuPG is usually installed already. Kleopatra or the gpg command line both work.
4Download safely
Get the tool from the project's official site and, if you can, verify the installer signature before running it.
Lesson summary
Kleopatra or GPG Suite are fine first tools; download them only from their official sites.
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