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    <p>You should use a KeyGenerator to generate the Key, </p> <p>AES key lengths are 128, 192, and 256 bit depending on the cipher you want to use.</p> <p>Take a look at the tutorial <a href="http://java.sun.com/developer/technicalArticles/Security/AES/AES_v1.html" rel="noreferrer">here</a> </p> <p>Here is the code for Password Based Encryption, this has the password being entered through System.in you can change that to use a stored password if you want. </p> <pre><code> PBEKeySpec pbeKeySpec; PBEParameterSpec pbeParamSpec; SecretKeyFactory keyFac; // Salt byte[] salt = { (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c, (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99 }; // Iteration count int count = 20; // Create PBE parameter set pbeParamSpec = new PBEParameterSpec(salt, count); // Prompt user for encryption password. // Collect user password as char array (using the // "readPassword" method from above), and convert // it into a SecretKey object, using a PBE key // factory. System.out.print("Enter encryption password: "); System.out.flush(); pbeKeySpec = new PBEKeySpec(readPassword(System.in)); keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES"); SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec); // Create PBE Cipher Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES"); // Initialize PBE Cipher with key and parameters pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec); // Our cleartext byte[] cleartext = "This is another example".getBytes(); // Encrypt the cleartext byte[] ciphertext = pbeCipher.doFinal(cleartext); </code></pre>
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    1. POJava AES and using my own Key
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    1. COHow do I generate my Key with the password using the KeyGenerator? I want to generate the same key based on the password. So I can decrypt the string later.
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      1. USBernie Perez
    2. COWhat your talking about is password based encryption not AES. I updated my answer with the sample program for PBE
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    3. COTry and use the PBEKDF2 key generator instead, using string "PBKDF2WithHmacSHA1" for the `SecretKeyFactory` for more up to date encryption.
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      1. USMaarten Bodewes
 

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