strings may be moved elsewhere in memory.
Fortunately, there is gpg-agent to cache passphrases in more secure
-way, so the EasyPG library dares *not* to cache passphrase by itself.
+way, so the EasyPG Library dares *not* to cache passphrase by itself.
Elisp programs can set `epg-context-passphrase-callback' to cache
user's passphrases.