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# TLS
21 May 2015

Logjam attack exposes data passed over TLS connections

Scientists have identified weaknesses in the way popular cryptographic algorithm Diffie-Hellman key exchange is deployed – notably, they discovered an attack that could enable the reading and modifying of data passed over TLS connections.

The attack can be used by a MITM attacker to downgrade TLS connections to 512-bit export-grade cryptography that is weaker and easier to crack, thus enabling the reading and modifying of data. The attack is similar to the FREAK attack, except it attacks Diffie-Hellman key exchange as opposed to RSA key exchange, and is the result of a flaw in TLS protocol.

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Tags:
Logjam TLS information leaks MITM HTTPS
Source:
SC Magazine
2540
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Axarhöfði 14,
110 Reykjavik, Iceland

Iceland - 2015