The main difference between SSL and PPTP and IPSEC VPN is that SSL VPN uses the HTTPS protocol for encryption, while PPTP and IPsec VPN use the IPsec protocol. SSL VPN is more compatible with most firewalls and routers than PPTP and IPSEC VPN. SSL VPN is also easier to set up than PPTP and IPSEC VPN.
PPTP uses a Point-to-Point Protocol (PPP) and IPsec uses the Internet Key Exchange (IKE) protocol. IKE is an Internet standard protocol that uses a Diffie-Hellman key exchange to set up a secure session.
SSL VPN is more secure than PPTP but less secure than IPSEC. PPTP is less secure than SSL VPN but more secure than IPSEC.
When should SSL and PPTP and IPSEC VPN be used?
SSL VPN should be used when security is paramount and data confidentiality is required. PPTP should be used when speed is more important than security. IPsec should be used when data integrity is important.