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In Kleopatra, go to File > New Key Pair > Create personal OpenPGP key pair > Advanced Settings > Select RSA with 4096 bits and a strong passphrase. For Linux/Mac: Use the GPG command line: gpg --full-generate-key . Choose RSA (sign and encrypt) with 4096 bits, set an expiration, and use a strong passphrase. Best practices: Generate keys on a secure, offline machine if possible, and backup your private key safely.