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    <p>When you encrypt with a private key, pycrypto is actually using the public key (which can be generated from the private key). </p> <p>Source: <a href="https://stackoverflow.com/questions/9893080/pycrypto-decrypt-only-with-public-key-in-file-no-privatepublic-key">PyCrypto: Decrypt only with public key in file (no private+public key)</a> </p> <p>You'll find that pycrypto doesn't allow you to decrypt using the public key for good reason:</p> <pre><code>&gt;&gt;&gt; publicKey.decrypt(enc2) Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "/usr/local/lib/python2.7/site-packages/pycrypto-2.6-py2.7-linux-x86_64.egg/Crypto/PublicKey/RSA.py", line 174, in decrypt return pubkey.pubkey.decrypt(self, ciphertext) File "/usr/local/lib/python2.7/site-packages/pycrypto-2.6-py2.7-linux-x86_64.egg/Crypto/PublicKey/pubkey.py", line 93, in decrypt plaintext=self._decrypt(ciphertext) File "/usr/local/lib/python2.7/site-packages/pycrypto-2.6-py2.7-linux-x86_64.egg/Crypto/PublicKey/RSA.py", line 239, in _decrypt mp = self.key._decrypt(cp) File "/usr/local/lib/python2.7/site-packages/pycrypto-2.6-py2.7-linux-x86_64.egg/Crypto/PublicKey/_slowmath.py", line 52, in _decrypt raise TypeError("No private key") TypeError: No private key </code></pre> <p>Mathematically, RSA makes it possible to encrypt with the private key and decrypt with the public key, but you're not supposed to do that. The public key is PUBLIC - it's something you would readily share and thus would be easily disseminated. There's no added value in that case compared to using a symmetric cipher and a shared key (see: <a href="https://crypto.stackexchange.com/questions/2123/rsa-encryption-with-private-key-and-decryption-with-a-public-key">https://crypto.stackexchange.com/questions/2123/rsa-encryption-with-private-key-and-decryption-with-a-public-key</a>)</p> <p>Conceptually, "encrypting" with the private key is more useful for signing a message whereas the "decryption" using the public key is used for verifying the message.</p> <p>More background: <a href="https://stackoverflow.com/questions/10967386/exchange-public-private-key-in-pkcs1-oaep-encryption-decryption">exchange public/private key in PKCS#1 OAEP encryption/decryption</a></p>
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