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 via Ivan Ristic, the writer of the preferred SSL Labs website, this booklet will educate you every little thing you want to 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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Tschofenig, May 2014) 20 Chapter 1: SSL, TLS, and Cryptography mechanism in TLS is based on the RSA algorithm; on the systems that use this approach, the RSA key used for the key exchange can also be used to decrypt all previous conversations. Other key-exchange mechanisms don’t suffer from this problem and are said to support forward secrecy. Unfortunately, most stay with the RSA algorithm. For example, Lavabit, the encrypted email service famously used by Edward Snowden, didn’t support forward secrecy.

Server indicates completion of its side of the negotiation. 6. Client sends additional information required to generate the master secret. 7. Client switches to encryption and informs the server. 8. Client sends a MAC of the handshake messages it sent and received. 9. Server switches to encryption and informs the client. 10. Server sends a MAC of the handshake messages it received and sent. At this point—assuming there were no errors—the connection is established and the parties can begin to send application data.

Digital Signatures A digital signature is a cryptographic scheme that makes it possible to verify the authenticity of a digital message or document. The MAC, which I described earlier, is a type of digital signature; it can be used to verify authenticity provided that the secret hashing key is securely exchanged ahead of time. Although this type of verification is very useful, it’s limited because it still relies on a private secret key. 14 RSA (Wikipedia, retrieved 2 June 2014) Building Blocks 13 Digital signatures similar to the real-life handwritten ones are possible with the help of public-key cryptography; we can exploit its asymmetric nature to devise an algorithm that allows a message signed by a private key to be verified with the corresponding public key.

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