Security+ Exam Prep Question of the Week By James Michael Stewart February 22, 2013 What is the encryption algorithm used by WEP? DES IDEA RC4 CAST The correct answer is 3. The encryption algorithm that forms the foundation of WEP is RC4. Related Courses Security+ Certification Boot Camp (SYO-301) Security+ Prep Course (SYO-301) CompTIA Advanced Security Practitioner (CASP) Prep Course In this article CertificationCompTIACybersecuritySecurity+Technology Join the Conversation Cancel Reply Will not be published. Website Notify me of follow-up comments by email. Notify me of new posts by email.