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    <p>I hope this helps you get a general idea. This one is Symmetric cryptography. </p> <pre><code>import java.security.*; import java.security.cert.*; import java.security.interfaces.*; import java.security.spec.*; import javax.crypto.*; import javax.crypto.interfaces.*; import javax.crypto.spec.*; import java.io.*; /** * AES */ public class SymmetricAES { public SymmetricAES() { } public static void main(String args[]){ BufferedReader ch = new BufferedReader(new InputStreamReader(System.in)); char[] toCode; byte[] toCode2; byte[] Coded; char[] Coded2; byte[] decoded; char[] deco2; try{ System.out.print("Text to Encrypt : "); String toMake = ch.readLine(); /** Arxikopoihsh antikeimenou KeyGenerator gia AES * kai dhmhourgia Kleidioy */ KeyGenerator keyGen = KeyGenerator.getInstance("AES"); SecretKey aesKey = keyGen.generateKey(); /* Arxikopoihsh aesCipher gia AES */ Cipher aesCipher = Cipher.getInstance("AES"); /* Orismos aesCipher se ENCRYPT_MODE me to aesKey */ aesCipher.init(Cipher.ENCRYPT_MODE, aesKey); System.out.println("The Key : " + aesKey.getEncoded()); /* Metatroph antikeimenou String se pinaka Char * kai o ka8e xarakthras gineta Cast se Byte kai eisagwgh * se pinaka Byte isou mege8ous me ton prwto pinaka */ toCode = toMake.toCharArray(); toCode2 = new byte[toCode.length]; Coded = new byte[toCode.length]; for(int i=0;i&lt;toCode.length;i++) toCode2[i] = (byte)toCode[i]; /* Teliko stadio Kryptografhshs */ Coded = aesCipher.doFinal(toCode2); /* byte[] --&gt; char[] kai ektypwsh*/ Coded2 = new char[Coded.length]; for(int i=0;i&lt;Coded.length;i++) Coded2[i] = (char)Coded[i]; System.out.println("Test Encrypt: " + new String(Coded2)); Cipher aesCipher2 = Cipher.getInstance("AES"); /* Orismos aesCipher2 se DECRYPT_MODE me to aesKey */ aesCipher2.init(Cipher.DECRYPT_MODE, aesKey); decoded = aesCipher2.doFinal(Coded); /* byte[] --&gt; char[] kai ektypwsh*/ deco2 = new char[decoded.length]; for(int i=0;i&lt;decoded.length;i++) deco2[i] = (char)decoded[i]; System.out.println("Test Decrypt: " + new String(deco2)); } catch(Exception e){ System.out.println(e); } } } </code></pre>
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    1. POHow to use cryptography in Java?
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    1. COThis code could do with some significant improvement. Lines like `System.out.println("The Key : " + aesKey.getEncoded());` and `System.out.println("Test Encrypt: " + new String(Coded2));` don't really make any sense.
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      1. USJames K Polk
 

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