Why is PPTP rated Grade D?

PPTP uses outdated encryption algorithms (e.g., RC4) with known security vulnerabilities, making it easy to crack. Therefore, it is rated the lowest grade and is not recommended for any use case.

How to determine a VPN's privacy protection grade?

Consider three factors: whether it has a strict no-logs policy (preferably independently audited), whether it supports anonymous registration (e.g., cryptocurrency payment), and whether the provider's jurisdiction is privacy-friendly (e.g., Iceland and Switzerland are Grade A; Five Eyes countries are Grade C).

A Guide to VPN Grading Standards: A Layered Evaluation Framework for Protocols, Encryption, and Privacy

Q: What is a VPN grading standard?

A VPN grading standard is a systematic evaluation framework that rates VPN services across five dimensions: protocol security, encryption strength, privacy protection, speed performance, and compatibility, helping users select the appropriate grade based on their needs.

5/26/2026 · 1 min

1. Introduction

With the increasing threats to cybersecurity, VPNs have become essential tools for protecting online privacy. However, the market is flooded with services of varying quality, lacking a unified evaluation standard. This article proposes a layered evaluation framework that grades VPNs across five dimensions: protocol security, encryption strength, privacy protection, speed performance, and compatibility, helping users make informed decisions.

2. Protocol Security Grading

VPN protocols form the foundation of data transmission, and their security directly impacts overall protection.

Grade A (Highest): WireGuard, OpenVPN (TLS 1.3). WireGuard uses modern cryptography with a small codebase for easy auditing; OpenVPN with TLS 1.3 provides strong authentication and encryption.
Grade B: IKEv2/IPsec, OpenVPN (TLS 1.2). IKEv2 performs well on mobile devices but relies on IPsec configuration; OpenVPN with TLS 1.2 remains secure but slightly inferior to 1.3.
Grade C: SSTP, L2TP/IPsec. SSTP is Windows-only and closed-source; L2TP/IPsec may be blocked by firewalls and has lower performance.
Grade D: PPTP. Obsolete with weak encryption, easily cracked, not recommended.

3. Encryption Strength Grading

Encryption algorithms determine the difficulty of data decryption.

Grade A: AES-256-GCM, ChaCha20-Poly1305. The former benefits from hardware acceleration; the latter is efficient and secure on mobile devices.
Grade B: AES-128-GCM, AES-256-CBC. AES-128-GCM is secure but has a shorter key length; CBC mode requires HMAC authentication.
Grade C: Blowfish, 3DES. Blowfish's 64-bit block size is vulnerable; 3DES is being phased out.
Grade D: RC4, DES. Completely unacceptable due to known vulnerabilities.

4. Privacy Protection Grading

Privacy involves logging policies, registration information, and legal jurisdiction.

Grade A: Strict no-logs policy (audited), anonymous registration (cryptocurrency), located in privacy-friendly jurisdictions (e.g., Iceland, Switzerland).
Grade B: No-logs policy (not independently audited), supports anonymous registration, located outside Five Eyes.
Grade C: Limited logs (connection time/bandwidth only), requires email registration, located within Five Eyes.
Grade D: Full activity logs, mandatory real-name registration, located in surveillance-heavy countries.

5. Speed and Compatibility Grading

Grade A: Low latency (<50ms), high throughput (>500Mbps), supports all major platforms and routers.
Grade B: Moderate latency (50-100ms), throughput 100-500Mbps, supports major platforms.
Grade C: High latency (>100ms), throughput <100Mbps, limited platform support.
Grade D: Severe speed reduction, frequent disconnections, supports only one platform.

6. Comprehensive Grading Recommendations

Users can assign weighted scores based on the above dimensions. For example:

Enterprise level: Requires Grade A protocol, encryption, and privacy to ensure data security.
Personal advanced: At least Grade B protocol, Grade A encryption, Grade B privacy, balancing security and speed.
Basic use: Grade C protocol, Grade B encryption, Grade C privacy, suitable for low-risk scenarios.

7. Conclusion

VPN grading standards are not absolute but provide a systematic comparison framework. Users should select appropriate grades based on their threat models and regularly review VPN services for security updates.