Server Features » TLS Key exchange group » P-521
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 by IRC server software.
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 by IRC server software.
| Software | Dec 2025 |
|---|---|
| charybdis | 70% |
| Hybrid | 4% |
| InspIRCd | 3% |
| Solanum | 1% |
| UnrealIRCd | 40% |