ef="../chapter_13/13.2/13.2.3.html"><strong aria-hidden="true">13.2.3.</strong> Example</a></li></ol></li><li class="chapter-item expanded "><a href="../chapter_13/13.3/index.html"><strong aria-hidden="true">13.3.</strong> Data Confidentiality Protection</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../chapter_13/13.3/13.3.1.html"><strong aria-hidden="true">13.3.1.</strong> Introduction to Data Encryption</a></li><li class="chapter-item expanded "><a href="../chapter_13/13.3/13