Bulletproof SSL and TLS: Understanding and Deploying SSL/TLS by Ivan Ristic

By Ivan Ristic

Bulletproof SSL and TLS is an entire advisor to utilizing SSL and TLS encryption to installation safe servers and net purposes. Written by means of Ivan Ristic, the writer of the preferred SSL Labs site, this ebook will train you every thing you must be aware of to guard your platforms from eavesdropping and impersonation assaults.

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Extra resources for Bulletproof SSL and TLS: Understanding and Deploying SSL/TLS and PKI to Secure Servers and Web Applications

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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. If we see a sequence number duplicate, we detect a replay attack. For best results, we should also use a special message to mark the end of the conversation. Without such a message, Mallory would be able to end (truncate) the conversation undetected.

Further, the keys are an attractive target: why spend months to brute-force a key when it might be much easier to break into a server to obtain it? Many cryptographic failures can be prevented by following simple rules such as these: (1) use well-established protocols and never design your own schemes; (2) use high-level libraries and never write code that deals with cryptography directly; and (3) use well-established primitives with sufficiently strong key sizes. Measuring Strength We measure the strength of cryptography using the number of operations that need to be performed to break a particular primitive, presented as bits of security.

My two favorite places are the TLS working group document page,2 where you can find the list of key documents and new proposals, and the TLS working group mailing list,3 where you can follow the discussions about the future direction of TLS. 2 (T. Dierks and E. Rescorla, August 2008) 2 TLS working group documents (IETF, retrieved 19 July 2014) 3 TLS working group mailing list archives (IETF, retrieved 19 July 2014) 23 Record Protocol At a high level, TLS is implemented via the record protocol, which is in charge of transporting—and optionally encrypting—all lower-level messages exchanged over a connection.

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