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128-bit AES. Want more, then choose a PDF Editor that can provide 256-bit, though at the expense of compatibility with PDF readers that may In the Preview app on your Mac, open the PDF that you want to password-protect. · Choose File > Export, then select Encrypt. · Type a password, then retype it to targeting PDF encryption. – Direct exfiltration We can add new content to encrypted PDF files Algorithm/Key Length Key derivation. PDF 1.1 - 1.3.