(or Data Encryption Standard), a (symmetric) block cipher using a 64 bit block size, with keys of size 56 bit, the standard US block cipher from 1976 to 2001.

learn more… | top users | synonyms

1
vote
1answer
5k views

c# Correct Triple Des Block Encryption Usage

I found the below code online, but in its original state, the encryption was not using any padding (Padding.None), and was encrypting in blocks of 8. I wasn't able to get this code to properly encrypt ...
3
votes
1answer
1k views

ANSI X9.9 Cryptography Standards

I'm trying to create a ISO8583 Rev93 message. What is the standard way of generating MAC key in ANSI X9.9 DES-CBC encryption algorithm is used to encrypt the ...
7
votes
4answers
3k views

Is there any opensource white-box implementation of AES or DES?

I googled it and give me no result. There is a binary executable of white-box implementation of DES (scroll down), but no source code provided. The same page also links various papers about ...
9
votes
4answers
547 views

Should DES be avoided when developing new systems?

According to wikipedia… DES is now considered to be insecure for many applications However, since it can be broken relatively easy, should it not just be avoided for all applications?
5
votes
1answer
3k views

What are the details of the DES weakness of reusing the same IV in CBC mode with the same key?

I think I once faced the recommendation, that the initialization vector should always be random and never be used twice with the same key. How serious is this weakness? Also, is AES less effected ...
19
votes
2answers
3k views

How were the DES S-box values determined?

It seems like the S-boxes in DES have essentially random values. How were these chosen?
33
votes
3answers
5k views

What are the benefits of the two permutation tables in DES?

Why do we use a permutation table in the first step of DES algorithm and one at the end of algorithm?