java - Crypt information in a file -


i'm developing desktop application, , have login form user has fill in order access application.

in login form have jcheckbox "remember me".

when user enters id , password , check "remember me" jcheckbox, want program crypt id , password save them in file.

my question is: how can crypt data? , if crypt them , want read them file, have decipher them?

the best solution not encrypt/decrypt username/password since can broken. anyway here java code example can use encrypt/decrypt data. use [aes][1] algorithm.

warning: code keep secret key inside java class not secure way store key, because have access class able view , use key decrypt encrypted information. key should stored in external file.

    import javax.crypto.cipher;     import javax.crypto.secretkey;     import javax.crypto.spec.secretkeyspec;      import org.apache.commons.codec.binary.base64;      public class cipherutil {          private static base64 coder;         // linebreak         private static byte[] linebreak = {}; // remove base64 encoder default         private static string secret = "qhebp92ihc13g741"; // secret key length must         // 16         private static secretkey key;         private static cipher cipher;          static {             try {                 key = new secretkeyspec(secret.getbytes(), "aes");                 cipher = cipher.getinstance("aes/ecb/pkcs5padding", "sunjce");                 coder = new base64(32, linebreak, true);             } catch (throwable t) {                 t.printstacktrace();             }         }          public static synchronized string encrypt(string plaintext) throws exception {             cipher.init(cipher.encrypt_mode, key);             byte[] ciphertext = cipher.dofinal(plaintext.getbytes());             return new string(coder.encode(ciphertext));         }          public static synchronized string decrypt(string codedtext) throws exception {             byte[] encypted = coder.decode(codedtext.getbytes());             cipher.init(cipher.decrypt_mode, key);             byte[] decrypted = cipher.dofinal(encypted);             return new string(decrypted);         }     }     [1]: http://en.wikipedia.org/wiki/advanced_encryption_standard

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