div tag problem
hi there,
i creating website.i seem having bit of trouble div tag...i think.the navigation bar , main content seem overlapping each other.any ideas?id appreciated help.
thanks.
<body>
<div id="header">heading</div>
<div id = "nav">
<ul id="fyp">
<li><a href="html/index.html">home</a> </li>
<li><a href="html/conventional.html">conventional encryption</a></li>
<li><a href="#">public key encryption</a>
<ul>
<li><a href="html/publickey-confidentiality.html">publickey-confidentiality</a></li>
<li><a href="html/publickey-authentication.html">publickey-authentication</a></li>
<li><a href="html/public key-confidentiality , authentication.html">public key-confidentiality , authentication</a></li>
</ul>
</li>
<li><a href="#">mac encryption</a>
<ul>
<li><a href="#">mac - message authentication</a></li>
<li><a href="#">message authentication , confidentiality (plaintext)</a></li>
<li><a href="#">message authentication , confidentiality(ciphertext)</a></li>
</ul>
</li>
<li><a href="#">hash encryption</a>
<ul>
<li><a href="#">encryption after concatenation</a></li>
<li><a href="#">encryption before concatenation</a></li>
<li><a href="#">authentication</a></li>
<li><a href="#">authentication , confidentiality</a></li>
<li><a href="#">secret value</a></li>
<li><a href="#">secret value , encryption</a></li>
</ul>
</li>
<li><a href="#">self test</a></li>
</ul>
</div>
<div id="main_content">
<p> </p>
<p>this home page message authentication , digital signatures.this page explain funamental basis of these elements.</p>
<p> </p>
<p><strong>authentication</strong>:</p>
<p><a name="#authtentication"></a>
the authentication service concerned assuring communication authentic. authentication acts warning or alarm signal. function of authentication service assure recipient message source calms from.</p>
<p> </p>
<p><strong>confidentiality</strong>:</p>
<p><a name = "confidenitiality"></a>
confidentiality protection of transmitted data passive attacks. makes sure message sent can not read anyboby except intended recipient .
</p>
<p> </p>
<p><strong>public key:</strong></p>
<p><a name = "public key"></a>
</p>
<p><strong>digital signature:</strong>
<p><a name = "digital signature"></a></p>
</p>
<p><strong>integrity:</strong>
<p><a name = "integrity"></a> </p>
<p><strong>mac function:</strong></p>
<p><a name = "mac"></a> </p>
<p>a mac (message authentication code) small fixed size block of data appended message. technique assumes hat 2 communicating parties (source , b) share common secret key(k). when sends message b, calculates mac function of message , key. recipient performs same calculation on received message using same key, generate new mac. received mac , calculated mac compared. if received mac matches calculated mac, message said authentic.</p>
</p>
</div>
<div id="footer">
<p>
footer - designer , contact links go here
</p>
</div>
</body>
</html>
can give css styles page please?
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