Psiphon is designed to provide you with open access to online content. Psiphon is not good at providing security or privacy. All your DNS traffic is safely redirected to secure servers. We were glad to see that Psiphon doesn’t have any DNS leaks. This means that you can access such sites without having your traffic encrypted or your speed reduced. Psiphon offers a split tunneling feature that will allow you to choose which apps will go through the VPN tunnel, and which will not. Sadly, this feature is only offered under the default SSH protocol. It disguises VPN traffic to make it appear just like regular VPN traffic, making it possible to avoid Deep Packet Inspection (DPI). Obfuscation technology is one of the main features of Psiphon VPN. Psiphon also provides the option to use L2TP/IPSec, which is more secure, but reportedly also vulnerable.
It is, however, sufficient for bypassing censorship. This means the protocol may not be good enough for sending sensitive content. The default SSH protocol is not very secure: organizations such as the NSA are known to be able to decrypt SSH traffic. Obfuscation technology (stealth protocol).Compared to most of the top premium VPNs, Psiphon doesn’t offer many security features.
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