Global Sales Contact List

Contact   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

RSA Laboratories

3.2.7 What is DESX?

DESX is a strengthened variant of DES supported by RSA Security's toolkits (see Question 5.2.3). The difference between DES and DESX is that, in DESX, the input plaintext is bitwise XORed with 64 bits of additional key material before encryption with DES and the output is also bitwise XORed with another 64 bits of key material. The security of DESX against differential and linear attack (see Question 2.4.5) appears to be equivalent to that of DES with independent subkeys (see Question 3.2.8) so there is not a great increase in security with regards to these attacks. However the main motivation for DESX was in providing a computationally simple way to dramatically improve on the resistance of DES to exhaustive key search attacks. This improved security was demonstrated in a formal manner by Killian and Rogaway [RK96] and Rogaway [Rog96]. The DESX construction is due to Rivest.

Top of the page

Connect with EMCConnect with EMC
Need help immediately? EMC Sales Specialists are standing by to answer your questions real time.
Use Live Chat for fast, direct access to EMC Customer Service Professionals to resolve your support questions.
Explore and compare EMC products in the EMC Store, and get a price quote from EMC or an EMC partner.
Explore our world-class business partners and connect with a partner today.
We're here to help. Send us your sales inquiry and an EMC Sales Specialist will get back to you within one business day.
Want to talk? Call us to speak with an EMC Sales Specialist live.