By Stephen A. Thomas
The safe Sockets Layer (SSL) and shipping Layer Security(TLS) protocols shape the basis for e-commerce protection at the world-wide-web, verifying the authenticity of websites, encrypting the move of delicate info, and making sure the integrity of knowledge exchanged. Now-for the 1st time the main points of those severe safety protocols come in an entire, transparent, and concise reference. SSL and TLS necessities presents entire documentation of the SSL and TLS protocols, together with complicated and proprietary extensions by no means ahead of released. The ebook completely covers the protocols in operation, together with the contents in their messages, message codecs, and the cryptographic calculations used to build them. The textual content additionally comprises an creation to cryptography and a proof of X.509 public key certificate. Stephen Thomas, writer of IPng and the TCP/IP Protocols, offers this complicated fabric in a transparent and reader-friendly demeanour. The publication comprises greater than eighty figures and illustrations to complement its textual content, and it describes SSL within the context of real-world, sensible purposes. Readers will instantly comprehend not just the educational ideas at the back of he protection protocols, yet how these ideas follow to their very own community safeguard challenges.The booklet comprises: * complete info of Netscape's SSL and the IETF's TLS protocols, with alterations among the 2 clearl highlighted and defined * A concise educational in cryptography * whole insurance of Netscape's foreign Step-Up and Microsoft's Server Gated Cryptography implementations * an outline of X.509 public key certificate * info on imposing backwards compatibility between earlier models of SSL and TLS * an intensive protection list with motives of all recognized assaults on SSL implementations, in addition to applicable countermeasures.The CD-ROM comprises handy digital types of the publication for: * home windows CE hand held desktops * Adobe Acrobat Reader for desktops
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Extra resources for SSL & TLS Essentials: Securing the Web
Example text
Cryptography gives Alice and Bob the means to protect their exchange. Before sending the postcard, Alice uses a secret code, or cipher, that only she and Bob understand. The cipher scrambles the information, rendering it unintelligible to parties such as Charles that do not know the secret code. Bob, however, knows the secret code and can decipher the necessary information. 2 Proving Identity Now consider the situation in figure 2-2. Bob receives a postcard with important information, purportedly from Alice.
0. Field Use Version Identifies the highest version of the SSL protocol that the client can support. RandomNumber A 32-byte random number used to seed the cryptographic calculations. SessionID Identifies a specific SSL session. CipherSuites A list of cryptographic parameters that the client can support. CompressionMethods Identifies data compression methods that the client can support. The Version field of the ClientHello message contains the highest version number of ssl that the client can support.
The critical aspect of secret key cryptography is that both parties know the same secret information. For this reason, it has the technical name symmetric encryption. Encryption algorithms, or ciphers, based on secret key techniques are usually just mathematical transformations on the data to be encrypted, combined with the secret key itself. The approach resembles a carnival shell game, with the secret key serving as the initial location of the pea. Bits are swapped around and combined with each other in very complicated ways, and yet the various transformations can readily be undone, provided one knows the key.