A prominent US senator is urging the National Security Agency (NSA) to provide public guidance on best practices for using virtual private networks (VPNs) to protect communications from foreign surveillance. According to reporting by Ars Technica, VPNs encrypt a user’s internet traffic and route it through a remote server, ensuring that the contents remain unreadable to anyone intercepting the data. However, while US agencies have recommended VPN usage, they have not specified which services offer adequate protection.
Understanding VPN Limitations
Despite their advantages, VPNs have limitations that can compromise user security. For example, the encrypted tunnel may terminate at a single server, which decrypts the traffic before sending it to its final destination. This exposes the decrypted data and the IP addresses involved to potential snooping by malicious actors or rogue employees. Additionally, VPNs do not encrypt certain metadata, such as timestamps, which can be exploited by nation-states for intelligence purposes.
Senator Ron Wyden (D-Ore.) has expressed concern over the lack of detailed guidance available to users. In a letter to NSA Director Gen. Joshua Rudd, he emphasized that individuals facing advanced foreign threats—including government personnel, defense contractors, journalists, and human rights defenders—deserve clear advice on safeguarding their communications. Wyden has requested that the NSA update its public guidance on VPN configurations to address these issues.
The senator’s letter raises specific technical questions regarding VPN architecture, including the effectiveness of single-hop versus multi-hop VPNs. Single-hop VPNs use one server to decrypt traffic, while multi-hop configurations route traffic through multiple servers, enhancing privacy. Wyden also inquires about the use of random delays and cryptographic padding to mitigate timing attacks and the adequacy of services like Apple Private Relay, Nym, and Tor.
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