div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../../../Cryptography/Private-Key Cryptography/Security Definitions/Ciphertext-Only Attack (COA)/Perfect Secrecy.html">Perfect Secrecy</a></li><li class="chapter-item "><a href="../../../../Cryptography/Private-Key Cryptography/Security Definitions/Ciphertext-Only Attack (COA)/Semantic Security.html">Semantic Security</a></li></ol></li><li class="chapter-item "><a href="../../../../Cryptography/Private-Key Cryptography/Secur