Which is the hardest to decrypt in VPN?

Question

Please reply to all the questions. Thanks.

1. Is PPTP, L2TP, OpenVPN, IPSec or others is the hardest to decrypt?
2. From the choices you have chosen, is that any free vpn which use that? If yes, please stated. If there are more than one, please state all.
3. Is it possible for ISP to decrypt VPN? If your answer is yes, does that mean VPN is useless for hiding behind your ISP or your government?

If you require a reply from me, please visit http://www.ivan-blog.tk/p/blog-page_5242.html to send a message to me directly.

Answer 1

Of the typical protocols used by consumers.



OpenVPN with 256 bit AES is the hardest assuming all other security protocols are followed by the vendor or person setting it up.



PPTP is pretty trivial.



Everything else is in between.

Answer 2

Tools Can Crack Widely Used PPTP Encryption (July-'12); https://www.pcworld.com/businesscenter/article/260012/tools_released_at_defcon_can_crack_widely_used_pptp_encryption.html

"Crack the encryption of any PPTP (Point-to-Point Tunneling Protocol) and WPA2-Enterprise (Wireless Protected Access) sessions that use MS-CHAPv2 for authentication. (Microsoft's version)

"...captured network traffic that contains a MS-CHAPv2 network handshake (PPTP VPN or WPA2 Enterprise handshake) and reduce the handshake's security to a single DES (Data Encryption Standard) key.

Marlinspike's advice to businesses and VPN providers was to stop using PPTP and switch to other technologies like IPsec or OpenVPN. Companies with wireless network deployments that use WPA2 Enterprise security with MS-CHAPv2 authentication should also switch to an alternative."

Answer 3

My spouse and i suggest making use of http://www.vpnpower.net to unblock internet sites. I am using their services for more than 4 years without any difficulties.

Answer 4

I do not have all the answers to your questions but it is true that the US government ordered that a back door be put into VPN. They have to get court order to use it but its there.