Edited ch13_security.adoc with Atlas code editor

ch13_security.adoc

@@ -80,6 +80,7 @@ removes control from users and centralizes control over keys in a single
 system. Many such systems have been hacked, with disastrous consequences
 for their customers.
 
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 Unless you are prepared to invest heavily in operational security,
 multiple layers of access control, and audits (as the traditional banks
 do), you should think very carefully before taking funds outside of