public Builder<T> setEncrypted(final boolean encrypted) {
            this.encrypted = encrypted;
            return this;
        }
@param encrypted {@code true} if this property should be encrypted, {@code false} if can be stored in
                 plain text. Defaults to plain text if not otherwise specified.
@return The current SystemProperty builder
xmppserver/src/main/java/org/jivesoftware/util/SystemProperty.java