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4096
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].
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----- MIICCAKCAgEAkz1L1of+R99oSCqLFhD+RvzATED0RjaMStoF6G7yEgHophYChHBO /JkbPIgVSrnc3LXE3Wf4LplMARdFMx9HmxiWgn+JZ75XgCAJcP4HmZ/3EPQZx+9R E/NHv5n+icG7LvJ1rMqkaJES/4dAXa1dMF/yyebzxX6SOrEbvuLE6JM6wfD74nQ6 1LiM1b70lkteDlKLXzPbqvVGfYMrsQ1QtU/k5PNvrTTOEaSwweAdpOdz4K1OJpRd nc1PIz88saIdZA7LuUfEB2O/Z4P5TipqLCTRNFsv77ZzC6Kleli3Fc13TkkGMnMJ NxHkZR4vWsHew4TOY6OaqKlA3G3UuVa0FhdhaE/NGkBY6noMPWOFa1ZkHQe+4RMK MkLQqKLPS3wky/nQ4wzNNNEkkRI/Dur2cNX6YZ6xiHP85iCxyp80VZHmyjPlPtKw Re5Alc52nvoIt/ugTOoAMurEhAdTEqe8PegZ52MTN1VI4sTnE9pmAQe7EVhsOUnj NaKLCu5b0AmEBXpkQvnDfOkLBdhARTLDIM+jFGe6QVjk2AD1zfVS1cQr7X2aX3RS rxMJRusqNo57H1W/r+C11A7oNurCi4I+YXtOH9l+s84Q5tfqA/IqttnDmCA7mHP0 ekRnAw4r0N6F9RlroNW65hcEcIdbvefqSuFAikzwIiAApYh12MFwa6MCAQU= -----END DH PARAMETERS-----
-----BEGIN DH PARAMETERS----- MIICDAKCAgEAkz1L1of+R99oSCqLFhD+RvzATED0RjaMStoF6G7yEgHophYChHBO /JkbPIgVSrnc3LXE3Wf4LplMARdFMx9HmxiWgn+JZ75XgCAJcP4HmZ/3EPQZx+9R E/NHv5n+icG7LvJ1rMqkaJES/4dAXa1dMF/yyebzxX6SOrEbvuLE6JM6wfD74nQ6 1LiM1b70lkteDlKLXzPbqvVGfYMrsQ1QtU/k5PNvrTTOEaSwweAdpOdz4K1OJpRd nc1PIz88saIdZA7LuUfEB2O/Z4P5TipqLCTRNFsv77ZzC6Kleli3Fc13TkkGMnMJ NxHkZR4vWsHew4TOY6OaqKlA3G3UuVa0FhdhaE/NGkBY6noMPWOFa1ZkHQe+4RMK MkLQqKLPS3wky/nQ4wzNNNEkkRI/Dur2cNX6YZ6xiHP85iCxyp80VZHmyjPlPtKw Re5Alc52nvoIt/ugTOoAMurEhAdTEqe8PegZ52MTN1VI4sTnE9pmAQe7EVhsOUnj NaKLCu5b0AmEBXpkQvnDfOkLBdhARTLDIM+jFGe6QVjk2AD1zfVS1cQr7X2aX3RS rxMJRusqNo57H1W/r+C11A7oNurCi4I+YXtOH9l+s84Q5tfqA/IqttnDmCA7mHP0 ekRnAw4r0N6F9RlroNW65hcEcIdbvefqSuFAikzwIiAApYh12MFwa6MCAQUCAgFF -----END DH PARAMETERS-----
powermod(x, k, m) = lift(Mod(x, m) ^ k); g = 0x5; 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);
$\begin{eqnarray}
p \equiv 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 \\
g \equiv 0x5 \\
\\
a \in \mathbb{Z}_q \\
b \in \mathbb{Z}_q \\
\\
A \equiv g^a \pmod{p} \\
B \equiv g^b \pmod{p} \\
\\
S \equiv {(g^{a})}^{b}={(g^{b})}^{a}=g^{ab} \pmod{p}
\end{eqnarray}$