...pushed through an interim standard that strengthened the encryption scheme, he said. "Vendors will jump in with interimsolutions, like Cellcrypt," Schatt said. "Mobile operators themselves will have to jump in and offer additional levels...
http://news.cnet.com/8301-27080_3-10316812-245.html
...token- or challenge response-based authentication, and standard IPsec supports these poorly. Proprietary and interimsolutions exist, but are complicated and saddled with their own vulnerabilities. The information IPsec VPNs use for policy...
http://www.findwhitepapers.com/whitepaper45/