What type of encryption is used in IPsec VPN configurations on FortiGate?

In IPsec VPN configurations on FortiGate, the use of Advanced Encryption Standard (AES) is standard due to its robust security and efficiency. AES is widely considered a secure and efficient encryption method that offers various key lengths (128, 192, and 256 bits), making it versatile for different security requirements. Its adoption in IPsec VPN provides confidentiality and integrity, ensuring that the data being transmitted over the VPN is protected against unauthorized access and alteration.

In contrast, Data Encryption Standard (DES) is an older encryption standard that has been deemed insecure due to its relatively short key length of 56 bits, which makes it susceptible to brute-force attacks. Although Triple DES (3DES) improves upon DES by using three iterations of the encryption process, it is still considered less efficient compared to AES and offers lower levels of performance.

RC4 also suffers from vulnerabilities and is not recommended for secure applications due to significant weaknesses that could allow for attacks on data confidentiality.

Overall, AES is the preferred choice for IPsec due to its strong security features and efficiency in processing, which aligns with the needs for modern VPN implementations.