Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Based on a previous question, I am using a sequential integer as a record ID in my database. I want to obfuscate the integer IDs using Skip32. I found a Java implementation but I am uncertain of how to initialize it using the standard JCE APIs. I need to encrypt an integer and decrypt it as necessary. Can anyone show me an example of this?
The code you found belongs to the Cryptix project. You need not just this one file, but you should take the whole package. Take the JCE package, install it as a provider. Then you should be able to use
But actually, instead of using an unsupported library like Cryptix, using the BouncyCastle library (or parts thereof) might be more recommendable. They have lots of documentation, and a SkipJack-implementation, too.
I’m not sure why you would need to use Skipjack instead of any cipher which comes with your JRE, though – just for the smaller block size?
If I understand right, Skip32 is a separate cipher (working on 4-byte blocks), just build by similar principles like Skipjack (which works on 8-byte blocks). I didn’t find any specification of it, only some C and Perl source code, so I doubt there will be some Java implementation available. Have a look at Format-preserving encryption on Wikipedia, or Can you create a strong blockcipher with small blocksize, given a strong blockcipher of conventional blocksize? on Cryptography Stack Exchange, which show other ways of building a small-block cipher from a larger one.