Firefox blocks websites with vulnerable encryption keys

To protect users from cryptographic attacks that can compromise secure web connections, the popular Firefox browser will block access to HTTPS servers that use weak Diffie-Hellman keys.

Diffie-Hellman is a key exchange protocol that is slowly replacing the widely used RSA key agreement for the TLS  (Transport Layer Security) protocol. Unlike RSA, Diffie-Hellman can be used with TLS’s ephemeral modes, which provide forward secrecy — a property that prevents the decryption of previously captured traffic if the key is cracked at a later time.

However, in May 2015 a team of researchers devised a downgrade attack that could compromise the encryption connection between browsers and servers if those servers supported DHE_EXPORT, a version of Diffie-Hellman key exchange imposed on exported cryptographic systems by the U.S. National Security Agency in the 1990s and which limited the key size to 512 bits. In May 2015 around 7 percent of websites on the internet were vulnerable to the attack, which was dubbed LogJam.

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Firefox blocks websites with vulnerable encryption keys

To protect users from cryptographic attacks that can compromise secure web connections, the popular Firefox browser will block access to HTTPS servers that use weak Diffie-Hellman keys.

Diffie-Hellman is a key exchange protocol that is slowly replacing the widely used RSA key agreement for the TLS  (Transport Layer Security) protocol. Unlike RSA, Diffie-Hellman can be used with TLS’s ephemeral modes, which provide forward secrecy — a property that prevents the decryption of previously captured traffic if the key is cracked at a later time.

However, in May 2015 a team of researchers devised a downgrade attack that could compromise the encryption connection between browsers and servers if those servers supported DHE_EXPORT, a version of Diffie-Hellman key exchange imposed on exported cryptographic systems by the U.S. National Security Agency in the 1990s and which limited the key size to 512 bits. In May 2015 around 7 percent of websites on the internet were vulnerable to the attack, which was dubbed LogJam.

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Continue reading Firefox blocks websites with vulnerable encryption keys→

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Armies of hacked IoT devices launch unprecedented DDoS attacks

Security researchers have been warning for years that poor security for internet of things devices could have serious consequences. We’re now seeing those warnings come true, with botnets made up of compromised IoT devices  capable of launching distributed denial-of-service attacks of unprecedented scale.

Octave Klaba, the founder and CTO of French hosting firm OVH, sounded the alarm on Twitter last week when his company was hit with two concurrent DDoS attacks whose combined bandwidth reached almost 1 terabit per second. One of the two attacks peaked at 799Gbps alone, making it the largest ever reported.

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Armies of hacked IoT devices launch unprecedented DDoS attacks

Security researchers have been warning for years that poor security for internet of things devices could have serious consequences. We’re now seeing those warnings come true, with botnets made up of compromised IoT devices  capable of launching distributed denial-of-service attacks of unprecedented scale.

Octave Klaba, the founder and CTO of French hosting firm OVH, sounded the alarm on Twitter last week when his company was hit with two concurrent DDoS attacks whose combined bandwidth reached almost 1 terabit per second. One of the two attacks peaked at 799Gbps alone, making it the largest ever reported.

To read this article in full or to leave a comment, please click here

Continue reading Armies of hacked IoT devices launch unprecedented DDoS attacks→

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