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2048
The Diffie-Hellman ephemeral public key parameter[409][410][411] with prime size greater than 2048[422] is considered secure, not weakened against logjam attack[7][8][9][10].
Use a well-known Diffie-Hellman ephemeral public key parameter[426][427][428], or generate a custom Diffie-Hellman ephemeral public key parameter[409][410][411] with a size greater or equal than 2048 bits but less or equal than 4096 bits. In the case of custom parameters, validate that the prime is a safe prime[176] to avoid a small subgroup confinement attack[72][73].
Unsafe Prime
The Diffie-Hellman ephemeral public key parameter[409][410][411] contains a non-safe prime[176], so a connection may be vulnerable to a small subgroup confinement attack[72][73].
Generate custom Diffie-Hellman ephemeral public key parameter[409][410][411] with size greater or equal than 2048 bits and validate that the prime in parameter is safe prime[176] or use a well-known Diffie-Hellman ephemeral public key parameter[426][427][428] with size greater or equal than 2048 bits.
False
The Diffie-Hellman[99][100][101][102][103] key exchange provides no protection against a cryptanalytic attack by a quantum computer, and no classical Diffie-Hellman does — just as no classical elliptic curve does — because a quantum computer breaks the hardness assumption they rely on. Only a hybrid key exchange (a classical algorithm combined with a post-quantum cryptography[158][159] one) or a pure post-quantum algorithm is quantum-safe.
Enable a hybrid key exchange or a pure post-quantum algorithm on your server, and prefer it where the configuration allows, so the connection stays secure against a future quantum computer.
-----BEGIN DH PARAMETERS----- MIICCQKCAQEAh6jmHbS2Zjz/u9GcZRlZmYzu9ghmDdDyXSzu1ENeOwDgDfjx1hlX 1Pr330VhsqowFsPZETQJb6o79Cltgw6afCCeDGSXUXq9WoqdMGvPZ+2R+eZyW0dY wCLgse9Cdb97bFv8EdRfkIi5QfVOseWbuLw5oL8SMH9cT9twxYGyP3a2Osrhyqa3 kC1SUmc1SIoO8TxtmlG/pKs62DR3llJNjvahZ7WkGCXZZ+FE5RQFZCUcysuD5rSG 9rPKP3lxUGAmwLhX9omWKFbe1AEKvQvmIcOjlgpU5xDDdfJjddcBQQOktUMwwZiv EmEW0iduEXFfaTh3+tfvCcrbCUrpHhoVlwKCAQA/syybcxNNCy53UGZg7b1ITKex jyHvIFQH9Hk6GguhJRDbwVB3vkY//0/tSqwLtVW+OmwbDGtHsbw3c79+jG9ikBIo +MKMuxilWuMTQQAKZQGW+THHelfy3fRj5ensFEt3feYqqrioYorDdtKC1u04ZOZ5 gkKOvIMdFDSPby+Rk7UEWvJ2cWTh38lnwfs/LlWkvRv/6DucgNBSuYXRguoK2yo7 cxPT/hTISEseBSWIubfSu9LfAWGZ7NBuFVfNCRWzNTu7ZODsN3/QKDcN+StSx4kU KM3GfrYYS1I9HbJGwy9jB4SQ8A741kfRSNR5VFFeIyfP75jFgmZLTA9sxBZZ -----END DH PARAMETERS-----
-----BEGIN DH PARAMETERS----- MIICDQKCAQEAh6jmHbS2Zjz/u9GcZRlZmYzu9ghmDdDyXSzu1ENeOwDgDfjx1hlX 1Pr330VhsqowFsPZETQJb6o79Cltgw6afCCeDGSXUXq9WoqdMGvPZ+2R+eZyW0dY wCLgse9Cdb97bFv8EdRfkIi5QfVOseWbuLw5oL8SMH9cT9twxYGyP3a2Osrhyqa3 kC1SUmc1SIoO8TxtmlG/pKs62DR3llJNjvahZ7WkGCXZZ+FE5RQFZCUcysuD5rSG 9rPKP3lxUGAmwLhX9omWKFbe1AEKvQvmIcOjlgpU5xDDdfJjddcBQQOktUMwwZiv EmEW0iduEXFfaTh3+tfvCcrbCUrpHhoVlwKCAQA/syybcxNNCy53UGZg7b1ITKex jyHvIFQH9Hk6GguhJRDbwVB3vkY//0/tSqwLtVW+OmwbDGtHsbw3c79+jG9ikBIo +MKMuxilWuMTQQAKZQGW+THHelfy3fRj5ensFEt3feYqqrioYorDdtKC1u04ZOZ5 gkKOvIMdFDSPby+Rk7UEWvJ2cWTh38lnwfs/LlWkvRv/6DucgNBSuYXRguoK2yo7 cxPT/hTISEseBSWIubfSu9LfAWGZ7NBuFVfNCRWzNTu7ZODsN3/QKDcN+StSx4kU KM3GfrYYS1I9HbJGwy9jB4SQ8A741kfRSNR5VFFeIyfP75jFgmZLTA9sxBZZAgIA 4Q== -----END DH PARAMETERS-----
powermod(x, k, m) = lift(Mod(x, m) ^ k); g = 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; p = 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; s = 256; a = 2 ^ (s - 1) + random(2 ^ (s - 1)); A = powermod(g, a, p); b = 2 ^ (s - 1) + random(2 ^ (s - 1)); B = powermod(g, b, p); S = powermod(B, a, p);
$\begin{eqnarray}
p \equiv 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 \\
g \equiv 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 \\
\\
a \in \mathbb{Z}_q \\
b \in \mathbb{Z}_q \\
\\
A \equiv g^a \pmod{p} \\
B \equiv g^b \pmod{p} \\
\\
S \equiv {(g^{a})}^{b}={(g^{b})}^{a}=g^{ab} \pmod{p}
\end{eqnarray}$