A convenient encryption using one-time-pad, great for short strings within files
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M-x one-time-pad-encrypt or Bind Command to a key:
(global-set-key (kbd "C-x") 'one-time-pad-encrypt) -
Use M-x one-time-pad-encrypt-hide-key to enter your key like a password (if you don't want people to see what you type)
- Mark text that should be encrypted
- Run command M-x one-time-pad-encrypt or with your shortcut
- Enter a string to be used as the encryption key (The length of the string should be as long if not longer than the marked text)
- The marked text should now be encrypted!
- Mark the encrypted text
- Run command M-x one-time-pad-encrypt or with your shortcut
- Enter the encryption key used to originally encrypt the text
- The marked text should now be decrypted!
This type of encryption is extremely secure (though inefficient in space) if several rules are followed
- Never reuse the same key for other data
Keys should be as different as possible from other keys also used with this encryption
- The key should be random (should contain as few repeated sequences as possible)
More details can be seen here https://en.wikipedia.org/wiki/One-time_pad