Server Features » TLS Key exchange group » P-521 » UnrealIRCd
TLS Key exchange group: P-521
Percentage of IRC SSL/TLS servers with key exchange Elliptic Curve Diffie-Hellman (ECDH) using P-521 (secp521r1).Showing percentages for UnrealIRCd servers only.
About this test result: Elliptic Curve Diffie-Hellman (ECDH) using P-521 curve (also called secp521r1).
This ECDH with classic cryptography is widely used today. However, it is not a PQC algorithm, so is vulnerable to Harvest now, decrypt later.
Table
Percentage of IRC SSL/TLS servers with key exchange Elliptic Curve Diffie-Hellman (ECDH) using P-521 (secp521r1).Showing percentages for UnrealIRCd servers only.
| Version | Dec 2025 |
|---|---|
| 4.0 | 14% |
| 4.2 | 80% |
| 5.0 | 90% |
| 5.2 | 95% |
| 6.0 | 95% |
| 6.1 | 42% |
| 6.2 | 2% |