java android URL encrypting

Question

I am working on an application that uploads a file to amazon s3(part of the application). But when I generate the URL of the files, it shows the authentication key, file name and etc. I need to encrypt the URL. Also I am using tiny url to shorten the URL but when I put the curser on the link it shows the real URL. I looked for md5 but I couldn't make it work. Is there any suggestion?

You are already deep in a solution attempt, lets go back a few steps, what is the root problem you try to solve? Why should nobody see the real URL? — Henry
– Henry, Commented Nov 1, 2013 at 8:48

Lucas Kauffman · Accepted Answer · 2014-01-11 07:47:32Z

2

I will try to explain how MD5 works

import java.math.*;
import java.security.*;

public class testMain {

    /**
     * @param args
     */
    public static void main(String[] args) {

        String stringThatNeedsToBeEncrpyted = "yourURL"; // Value to encrypt
        MessageDigest mdEnc = null;
        try {
            mdEnc = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } // Encryption algorithm
        mdEnc.update(stringThatNeedsToBeEncrpyted.getBytes(), 0, stringThatNeedsToBeEncrpyted.length());
        String md5 = new BigInteger(1, mdEnc.digest()).toString(16); //Make the Encrypted string
        System.out.println(md5); //print the string in the console

    }   
}

The output is : 7f5976785d03c60f9fd4b08fb78e72ce

This is your message digest.

EDIT

Hashing a username and password should always be done with an appropriate hashing algorithm like PBKDF2, bcrypt or scrypt. Furthermore always use SSL to transfer confidential data.

edited Jan 11, 2014 at 7:47

answered Apr 24, 2011 at 23:27

Lucas Kauffman

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2 Comments

Emre Canbazoğlu Over a year ago

but how can I use this output as URL?

Lucas Kauffman Over a year ago

well what you can do is instead of completely hashing your algorithm, just hash the password and username (preferably salt it) and add to a GET in your url ?

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