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epa: Caching Passphrases

 
 5 Caching Passphrases
 *********************
 
 Typing passphrases is a troublesome task if you frequently open and
 close the same file.  GnuPG and EasyPG Assistant provide mechanisms to
 remember your passphrases.  However, the configuration is a bit
 confusing since it depends on your GnuPG installationGnuPG version
 compatibility, encryption method (symmetric or public key), and
 whether or not you want to use gpg-agent.  Here are some questions:
 
   1. Do you use GnuPG version 2.1 or 2.0 instead of GnuPG version 1.4?
   2. Do you use symmetric encryption rather than public key encryption?
   3. Do you want to use gpg-agent?
 
    Here are configurations depending on your answers:
 
 1     2     3     Configuration
 Yes   Yes   Yes   Set up gpg-agent.
 Yes   Yes   No    You can’t, without gpg-agent.
 Yes   No    Yes   Set up gpg-agent.
 Yes   No    No    You can’t, without gpg-agent.
 No    Yes   Yes   Set up elisp passphrase cache.
 No    Yes   No    Set up elisp passphrase cache.
 No    No    Yes   Set up gpg-agent.
 No    No    No    You can’t, without gpg-agent.
 
    To set up gpg-agent, follow the instruction in GnuPG manual.  
 Invoking GPG-AGENT (gnupg)Invoking GPG-AGENT.
 
    To set up elisp passphrase cache, set
 ‘epa-file-cache-passphrase-for-symmetric-encryption’.  
 Encrypting/decrypting gpg files.
 

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