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. Elisp
-programs can set `epg-context-passphrase-callback' to cache user's
-passphrases.
+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.