What encryption standard is commonly utilized in FortiClient VPNs for data transmission?

The commonly utilized encryption standard in FortiClient VPNs for data transmission is Advanced Encryption Standard (AES). This symmetric encryption protocol is widely regarded for its security, efficiency, and speed, making it suitable for secure communications over networks. AES allows for multiple key lengths, typically 128, 192, or 256 bits, providing flexibility in balancing security with performance requirements.

In the context of VPNs, AES is preferred because it offers strong protection against a variety of cryptographic attacks while maintaining high performance, even on devices with limited processing power. This is particularly important for VPN solutions like FortiClient, which need to secure internet traffic without significantly degrading the user experience or performance.

Other encryption standards mentioned, such as RSA, DES, and 3DES, do not match AES in terms of both security and efficiency for modern VPN applications. RSA is primarily used for secure key exchange rather than data encryption. DES and 3DES, while historically significant, have been largely phased out in favor of AES due to their vulnerabilities and lower security levels. Therefore, AES stands out as the optimal choice for FortiClient VPNs, ensuring robust data protection during transmission.