If speed is your top priority, consider PPTP. Here are the best VPN protocols that use should consider instead:. Most VPN providers offer this protocol as well. L2TP tunnels are extremely stable, even more-so than PPTP, though speeds might be a tad slower partially due to stronger encryption.
It offers even better security and equivalent performance if not better. OpenVPN is available in multiple encryption strengths, which allow you to prioritize speed or security based on your needs. AC , Torguard and Private Internet Access are a few of the services that let you switch encryption modes. Wireguard is the newest mainstream protocol, and still proving itself in the eyes of security researchers. Wireguard uses eliptic curve encryption ECC in an effort to achieve a more optimal blend of security, stability and performance.
MPPE uses unique keys in each direction. This is to prevent the trivial cryptanalytic attack of XORing the text stream in each direction to remove the effects of the encryption. The only thing left according to Schneier and Mudge is password guessing which you can circumvent by using a decent password and optionally not using integrated Windows AD authentication, but separate logins.
These changes address most of the major security weaknesses of the orginal protocol. However, the revised protocol is still vulnerable to offline password-guessing attacks from hacker tools such as L0phtcrack. Especially suitable for use in home routers. Years later another authentication issue came up.
An attacker has to be able to intercept the victim's MS-CHAP v2 handshake in order to exploit this weakness, by performing man-in-the-middle attacks or by intercepting open wireless traffic. An attacker who obtained the MS-CHAP v2 authentication traffic could then use the exploit code to decrypt a user's credentials. We never heard of a real hack or even attempts. The hacker needs to be able to read the client's network communication which is mostly not feasible. It still kind of works.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Ask Question. Asked 7 years, 11 months ago. Active 2 months ago. Viewed 39k times. Improve this question. This is what I'm looking for For enterprise use, PPTP is out.
How broken is PPTP for single, non-enterprise use? Everything we found was based on our own testing on our own test network. Who paid you to do the cryptanalysis? Their needs were much more general than the analysis we did, and we completed the detailed analysis on our own time because it was interesting. It depends on your data.
Well, Microsoft could rewrite the whole thing from scratch if they wanted to. Customers have no way of fixing it; they can either use it or not. There are several on the market, and there will be more. It would have been the right thing to do. Someone who is developing a VPN product can, but individual users cannot. Most people seem to downplay the importance of good security. Products that are buzzword compliant—that have strong algorithms and long keylengths and meet standards—do very well in the marketplace even though they may be completely insecure.
All the analysis has been verified in the labs of Counterpane Systems. We stand by our work.
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