*** There is no way to clear strings safely.
To prevent passphrases from been stealing from cores, `read-passwd'
function clears passphrase strings by `(fillarray string 0)'.
-However, it is not enough. In GC sweep phase, Emacs does compaction
-on small strings. If GC happens before `fillarray', passphrase
-strings may be copied elsewhere in the memory.
-
-PGG and gpg.el enables passphrase caching by default.
+However, it is not enough. Emacs does compaction of small strings in
+GC sweep phase. If GC happens before `fillarray', passphrase strings
+may be copied elsewhere in the memory. PGG and gpg.el enables
+passphrase caching by default.