Logjam

cryptography

A 2015 attack downgrading Diffie-Hellman key exchange to weak 512-bit export parameters.

Logjam tricked servers into using export-grade DH groups small enough to break, then computed the shared secret. It revealed how many servers reused the same well-known primes, making precomputation attacks practical.

Also known as: Logjam, CVE-2015-4000

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