Solved

Java .class Files and Security

Posted on 2009-05-07
4
180 Views
Last Modified: 2013-12-29
Hello,

I was curious how secure Java .class files are created using current versions of Java.

1. Can a Java .class file be uncompiled to be able to see the source code?

2. Is there a way to prevent this and\or encrypt it?


Thanks,

Michael
0
Comment
Question by:michael4606
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 150 total points
ID: 24326420
>>1. Can a Java .class file be uncompiled to be able to see the source code?

Yes, using a decompiler

>> 2. Not ultimately. All you can do is make it more difficult by using an obfuscator.


If you keep classes server-side, they should be safe though.
0
 
LVL 12

Expert Comment

by:basav_com
ID: 24326434
You can use java decompilers to see the source code of the .class files.
http://www.javaworld.com/javaworld/jw-07-1997/jw-07-decompilers.html
0
 
LVL 12

Accepted Solution

by:
basav_com earned 250 total points
ID: 24326453
You can use 'Code Obfuscation' to prevent reverse engineering :)
http://www.cs.arizona.edu/~collberg/Research/Students/DouglasLow/obfuscation.html
0
 
LVL 92

Assisted Solution

by:objects
objects earned 100 total points
ID: 24332221
1. usually, though the quality of the source depends on what ofuscation was applied

Have a look here http://www.zelix.com/klassmaster/index.html


This is a good read on the subject

http://www.excelsior-usa.com/articles/java-obfuscators.html
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
fibonacci ten numbers 4 54
servlet example 17 59
Java Restore security prompts not working 10 140
Java 8 to Java 6 8 33
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This video teaches viewers about errors in exception handling.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question