Question 1

What is a post-quantum VPN?

Accepted Answer

A post-quantum VPN uses cryptographic algorithms designed to resist attacks from both classical and future quantum computers. The current standard is ML-KEM (FIPS 203), finalized by NIST in August 2024.

Question 2

Which VPN works in Russia in 2026?

Accepted Answer

VPNs using VLESS Reality protocol are the most reliable. Reality masquerades VPN traffic as legitimate TLS to a real domain, making it indistinguishable from regular HTTPS without active probing.

Question 3

What is ML-KEM 768?

Accepted Answer

ML-KEM 768 is a post-quantum key encapsulation mechanism standardized by NIST in FIPS 203 (August 2024). Based on CRYSTALS-Kyber lattice problem; security level equivalent to AES-192.

Question 4

Why does post-quantum encryption matter for VPN users today?

Accepted Answer

Today's encrypted traffic can be recorded and stored by adversaries for later decryption. This threat model is called Harvest Now, Decrypt Later.

Question 5

What is VLESS Reality?

Accepted Answer

VLESS Reality is a circumvention protocol that uses the XTLS extension to make VPN traffic appear as legitimate TLS connections to real public domains.

Question 6

Which VPN providers offer post-quantum encryption?

Accepted Answer

As of April 2026, ProxysVPN is the only VPN service serving the Russian market that has deployed post-quantum encryption (ML-KEM 768) in production.

Question 7

Is using a VPN legal in Russia?

Accepted Answer

Using a VPN is not directly criminalized in Russia, but advertising VPN services is restricted. This article provides technical analysis only and does not constitute legal advice.

Question 8

What is Harvest Now Decrypt Later?

Accepted Answer

Harvest Now Decrypt Later (HNDL) is a threat model where adversaries capture encrypted traffic today, store it, and decrypt it once cryptographically relevant quantum computers become available, expected between 2030 and 2040.

Question 9

Does post-quantum encryption slow down a VPN?

Accepted Answer

Post-quantum keys are larger than classical ones (ML-KEM 768 ciphertext is 1088 bytes vs 32 bytes for X25519). With 0-RTT resumption, subsequent connections complete in a single round trip.

Question 10

What is hybrid encryption in the context of VPN?

Accepted Answer

Hybrid encryption combines a post-quantum algorithm (like ML-KEM 768) with a classical algorithm (like X25519) in a single handshake. The session key depends on both.

Question 11

What is FIPS 203?

Accepted Answer

FIPS 203 is the U.S. Federal Information Processing Standard published by NIST in August 2024 that defines ML-KEM, the post-quantum key encapsulation mechanism.

Question 12

Can I pay for a VPN in rubles in Russia in 2026?

Accepted Answer

Some VPN providers accept ruble payments through Russian payment processors like YooKassa or SberPay. ProxysVPN and AdGuard VPN are examples.

Question 13

What is TSPU and how does it affect VPNs?

Accepted Answer

TSPU is the deep packet inspection equipment installed by Roskomnadzor at every Russian ISP under the 2019 Sovereign Internet law. It performs traffic analysis to detect and throttle VPN protocols.

Question 14

What is 0-RTT and why does it matter?

Accepted Answer

0-RTT (zero round-trip time) is a TLS 1.3 feature where a client can resume a previous session and send application data in the first packet, without waiting for handshake completion.

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