By Stephen A. Thomas
The safe Sockets Layer (SSL) and shipping Layer Security(TLS) protocols shape the basis for e-commerce safeguard at the world-wide-web, verifying the authenticity of sites, encrypting the move of delicate information, and making sure the integrity of knowledge exchanged. Now-for the 1st time the main points of those severe safety protocols are available an entire, transparent, and concise reference. SSL and TLS necessities offers entire documentation of the SSL and TLS protocols, together with complicated and proprietary extensions by no means prior to 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, provides 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, functional purposes. Readers will instantly comprehend not just the tutorial ideas at the back of he defense protocols, yet how these ideas observe to their very own community safety challenges.The ebook comprises: * complete information of Netscape's SSL and the IETF's TLS protocols, with changes among the 2 clearl highlighted and defined * A concise instructional in cryptography * whole assurance of Netscape's overseas 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 * a radical protection record with motives of all recognized assaults on SSL implementations, besides applicable countermeasures.The CD-ROM comprises handy digital models of the publication for: * home windows CE hand-held desktops * Adobe Acrobat Reader for desktops
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Extra info for SSL & TLS Essentials: Securing the Web
The server must select a single cipher suite from among those listed by the client in its ClientHello message. SSL vs. 0. SSL Operation 45 The CompressionMethod field is also singular for a ServerHello. In theory, the server uses this field to identify the data compression to be used for the session. Again, the server must pick from among those listed in the ClientHello. Current ssl versions have not defined any compression methods, however, so this field has no practical utility. 3 ServerKeyExchange In this example, the server follows its ServerHello message with a ServerKeyExchange message.
Null ? null ? Write Act Pnd Act Encr MAC key null null null null null null Encr MAC key Act null null null Encr MAC key Act null null null Encr MAC key Write Act Pnd DES ? MD5 ? xxx ? Encr MAC key ServerHello 5 6 7 2 ServerKeyExchange 3 ServerHelloDone 4 ClientKeyExchange DES MD5 ? Write ChangeCipherSpec Pnd DES MD5 xxx Write Finished ChangeCipherSpec 8 Finished 9 Figure 3-3 SSL servers also build pending cipher suites. Pnd DES MD5 xxx Read Pnd DES MD5 ? Read Act null null null Pnd DES MD5 xxx Read Act null null null Pnd DES MD5 xxx Read Act Pnd DES ?
Subject Subject's Public Key Issuer Unique ID Subject Unique ID Extensions Subject's Public Key verifies the certificate's Signature. Signature Figure 2-9 CA certificates have the same issuer and subject. distinction from normal certificates. Any party that receives a normal certificate can check the certificate’s signature to decide whether to trust the public key in that certificate. As long as the certificate’s signature is valid and the issuer is trustworthy, then the receiving party can safely trust the public key.
SSL & TLS Essentials: Securing the Web by Stephen A. Thomas