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<a href="Crypto-module.html">Package Crypto</a> ::
Package Cipher
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<!-- ==================== PACKAGE DESCRIPTION ==================== -->
<h1 class="epydoc">Package Cipher</h1><p class="nomargin-top"></p>
<p>Symmetric- and asymmetric-key encryption algorithms.</p>
<p>Encryption algorithms transform plaintext in some way that
is dependent on a key or key pair, producing ciphertext.</p>
<div class="rst-section" id="rst-symmetric-algorithms">
<h1 class="heading">Symmetric algorithms</h1>
<p>Encryption can easily be reversed, if (and, hopefully, only if)
one knows the same key.
In other words, sender and receiver share the same key.</p>
<p>The symmetric encryption modules here all support the interface described in PEP
272, "API for Block Encryption Algorithms".</p>
<p>If you don't know which algorithm to choose, use AES because it's
standard and has undergone a fair bit of examination.</p>
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<tr><td><a href="Crypto.Cipher.AES-module.html" class="link">Crypto.Cipher.AES</a></td>
<td>Block</td>
<td>Advanced Encryption Standard</td>
</tr>
<tr><td><a href="Crypto.Cipher.ARC2-module.html" class="link">Crypto.Cipher.ARC2</a></td>
<td>Block</td>
<td>Alleged RC2</td>
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<tr><td><a href="Crypto.Cipher.ARC4-module.html" class="link">Crypto.Cipher.ARC4</a></td>
<td>Stream</td>
<td>Alleged RC4</td>
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<tr><td><a href="Crypto.Cipher.Blowfish-module.html" class="link">Crypto.Cipher.Blowfish</a></td>
<td>Block</td>
<td>Blowfish</td>
</tr>
<tr><td><a href="Crypto.Cipher.CAST-module.html" class="link">Crypto.Cipher.CAST</a></td>
<td>Block</td>
<td>CAST</td>
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<tr><td><a href="Crypto.Cipher.DES-module.html" class="link">Crypto.Cipher.DES</a></td>
<td>Block</td>
<td>The Data Encryption Standard.
Very commonly used in the past,
but today its 56-bit keys are too small.</td>
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<tr><td><a href="Crypto.Cipher.DES3-module.html" class="link">Crypto.Cipher.DES3</a></td>
<td>Block</td>
<td>Triple DES.</td>
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<tr><td><a href="Crypto.Cipher.XOR-module.html" class="link">Crypto.Cipher.XOR</a></td>
<td>Stream</td>
<td>The simple XOR cipher.</td>
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<div class="rst-section" id="rst-asymmetric-algorithms">
<h1 class="heading">Asymmetric algorithms</h1>
<p>For asymmetric algorithms, the key to be used for decryption is totally
different and cannot be derived in a feasible way from the key used
for encryption. Put differently, sender and receiver each own one half
of a key pair. The encryption key is often called <tt class="rst-docutils literal">public</tt> whereas
the decryption key is called <tt class="rst-docutils literal">private</tt>.</p>
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<tr><td><a href="Crypto.Cipher.PKCS1_v1_5-module.html" class="link">Crypto.Cipher.PKCS1_v1_5</a></td>
<td>PKCS#1 v1.5 encryption, based on RSA key pairs</td>
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<tr><td><a href="Crypto.Cipher.PKCS1_OAEP-module.html" class="link">Crypto.Cipher.PKCS1_OAEP</a></td>
<td>PKCS#1 OAEP encryption, based on RSA key pairs</td>
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<li> <strong class="uidlink"><a href="Crypto.Cipher.AES-module.html">Crypto.Cipher.AES</a></strong>: <em class="summary">AES symmetric cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.ARC2-module.html">Crypto.Cipher.ARC2</a></strong>: <em class="summary">RC2 symmetric cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.ARC4-module.html">Crypto.Cipher.ARC4</a></strong>: <em class="summary">ARC4 symmetric cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.Blowfish-module.html">Crypto.Cipher.Blowfish</a></strong>: <em class="summary">Blowfish symmetric cipher</em> </li>
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<li> <strong class="uidlink"><a href="Crypto.Cipher.DES-module.html">Crypto.Cipher.DES</a></strong>: <em class="summary">DES symmetric cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.DES3-module.html">Crypto.Cipher.DES3</a></strong>: <em class="summary">Triple DES symmetric cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.PKCS1_OAEP-module.html">Crypto.Cipher.PKCS1_OAEP</a></strong>: <em class="summary">RSA encryption protocol according to PKCS#1 OAEP</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.PKCS1_v1_5-module.html">Crypto.Cipher.PKCS1_v1_5</a></strong>: <em class="summary">RSA encryption protocol according to PKCS#1 v1.5</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.XOR-module.html">Crypto.Cipher.XOR</a></strong>: <em class="summary">XOR toy cipher</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Cipher.blockalgo-module.html">Crypto.Cipher.blockalgo</a></strong>: <em class="summary">Module with definitions common to all block ciphers.</em> </li>
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