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    <p>Official document of <a href="http://www.cryptopp.com/wiki/Advanced_Encryption_Standard" rel="noreferrer">Crypto++ AES</a> is a good start. And from my archive, a basic implementation of AES is as follows:</p> <p>Please refer <a href="http://www.cryptopp.com/fom-serve/cache/79.html" rel="noreferrer">here</a> with more explanation, I recommend you first understand the <a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard" rel="noreferrer">algorithm</a> and then try to understand each line step by step.</p> <pre><code>#include &lt;iostream&gt; #include &lt;iomanip&gt; #include "modes.h" #include "aes.h" #include "filters.h" int main(int argc, char* argv[]) { //Key and IV setup //AES encryption uses a secret key of a variable length (128-bit, 196-bit or 256- //bit). This key is secretly exchanged between two parties before communication //begins. DEFAULT_KEYLENGTH= 16 bytes byte key[ CryptoPP::AES::DEFAULT_KEYLENGTH ], iv[ CryptoPP::AES::BLOCKSIZE ]; memset( key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH ); memset( iv, 0x00, CryptoPP::AES::BLOCKSIZE ); // // String and Sink setup // std::string plaintext = "Now is the time for all good men to come to the aide..."; std::string ciphertext; std::string decryptedtext; // // Dump Plain Text // std::cout &lt;&lt; "Plain Text (" &lt;&lt; plaintext.size() &lt;&lt; " bytes)" &lt;&lt; std::endl; std::cout &lt;&lt; plaintext; std::cout &lt;&lt; std::endl &lt;&lt; std::endl; // // Create Cipher Text // CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption( aesEncryption, iv ); CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink( ciphertext ) ); stfEncryptor.Put( reinterpret_cast&lt;const unsigned char*&gt;( plaintext.c_str() ), plaintext.length() + 1 ); stfEncryptor.MessageEnd(); // // Dump Cipher Text // std::cout &lt;&lt; "Cipher Text (" &lt;&lt; ciphertext.size() &lt;&lt; " bytes)" &lt;&lt; std::endl; for( int i = 0; i &lt; ciphertext.size(); i++ ) { std::cout &lt;&lt; "0x" &lt;&lt; std::hex &lt;&lt; (0xFF &amp; static_cast&lt;byte&gt;(ciphertext[i])) &lt;&lt; " "; } std::cout &lt;&lt; std::endl &lt;&lt; std::endl; // // Decrypt // CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption( aesDecryption, iv ); CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink( decryptedtext ) ); stfDecryptor.Put( reinterpret_cast&lt;const unsigned char*&gt;( ciphertext.c_str() ), ciphertext.size() ); stfDecryptor.MessageEnd(); // // Dump Decrypted Text // std::cout &lt;&lt; "Decrypted Text: " &lt;&lt; std::endl; std::cout &lt;&lt; decryptedtext; std::cout &lt;&lt; std::endl &lt;&lt; std::endl; return 0; } </code></pre> <p>For installation details :</p> <ul> <li><a href="https://stackoverflow.com/questions/6619042/how-do-i-install-crypto-in-visual-studio-2010-windows-7">How do I install Crypto++ in Visual Studio 2010 Windows 7?</a></li> <li><a href="http://www.cryptopp.com/wiki/Linux" rel="noreferrer">*nix environment</a></li> <li>For Ubuntu I did: </li> </ul> <p><code>sudo apt-get install libcrypto++-dev libcrypto++-doc libcrypto++-utils</code></p>
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    1. COi added cryptlib.lib in the additional dependencies and tried to build it on VS2010 but got 47 linking errors most are like the following :- error LNK2005: _tolower already defined in MSVCRTD.lib(MSVCR100D.dll) , any help in that?
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    2. CO@user1470033 , i just added some installation links.
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    3. COI accidentally clicked the Flag icon in your last comment. I hope it didn't harm your points! Sorry.
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