Bulletproof SSL and TLS by Ivan Ristić

By Ivan Ristić

Knowing and deploying SSL/TLS and PKI to safe servers and internet functions, via Ivan Ristić

For method directors, builders, and IT protection pros, this booklet presents a finished assurance of the ever-changing box of SSL/TLS and web PKI. Written through Ivan Ristić, a safety researcher and writer of SSL Labs, this ebook will educate you every little thing you must comprehend to guard your platforms from eavesdropping and impersonation assaults.

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Extra resources for Bulletproof SSL and TLS

Sample text

With all of these measures in place, the best Mallory can do is prevent Alice and Bob from talking to one another. There’s nothing we can do about that. Protocols 15 So far, so good, but we’re still missing a big piece: how are Alice and Bob going to negotiate the two needed keys (one for encryption and the other for integrity validation) in the presence of Mallory? We can solve this problem by adding two additional steps to the protocol. First, we use public-key cryptography to authenticate each party at the beginning of the conversation.

It’s liked because it provides forward secrecy but disliked because it’s slow. DHE is a key agreement algorithm; the negotiating parties both contribute to the process and agree on a common key. In TLS, DHE is commonly used with RSA authentication. ECDHE_RSA and ECDHE_ECDSA Ephemeral elliptic curve Diffie-Hellman (ECDHE) key exchange is based on elliptic curve cryptography, which is relatively new. It’s liked because it’s fast and provides forward secrecy. It’s well supported only by modern clients.

To fix this problem, we can calculate a MAC of each message using a hashing key known only to Alice and Bob. When we send a message, we send along the MAC as well. Now, Mallory can’t modify the messages any longer. However, she could still drop or replay arbitrary messages. To deal with this, we extend our protocol to assign a sequence number to each message; crucially, we make the sequences part of the MAC calculation. If we see a gap in the sequence numbers, then we know that there’s a message missing.

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