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As mentioned earlier, public-key cryptography suffers from the risk that you might be getting a message or a public key from someone who isn t who they say they are To avoid this problem we add a digital signature A digital signature is another string of ones and zeroes that can only be generated by the sender, usually by doing something mathematically complex (part of the algorithms always include some hashing) to the message and the private key The person with the matching public key does something to the digital signature using the public key to verify it came from the intended sender Digital signatures are very popular with e-mail users Figure 11-12 shows an e-mail message both encrypted and digitally signed in Mozilla Thunderbird using a special Thunderbird add-on called OpenPGP You ll read more about the PGP family of authentication/encryption tools later in this chapter

printf("%d", mblen(mb, 2));

#include <stdlibh> size_t mbstowcs(wchar_t *out, const char *in, size_t size);

Hybrid A hybrid key system, or hybrid switch, is one that supports devices which are both bridged and not bridged If the devices with standard appearances can establish calls to or through devices other than a single designated network interface device, the switch is effectively a PBX that supports bridging Virtual Key System In a virtual key system, there is no central KSU cabinet Instead, pieces of the KSU functionality are implemented among each of the special telephone stations that make up the system Each telephone station has a connection to every other telephone station and to all of the trunks Call processing and switching functionality is distributed among all of the telephone stations Despite the fact that there is no physical KSU cabinet, this type of key system is still modeled as shown in Figure 10-3

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Digital signatures are great, but what happens when you want to do business with someone you do not know Before you enter a credit card number to buy that new USB3 Blu-ray Disc player, wouldn t you like to know that the Web site you are doing business with truly is eBay To address that need, the industry came up with the idea of certificates A certificate is a standardized type of digital signature that usually includes the digital signature of a third party, a person or a company that guarantees that who is passing out this certificate truly is who they say they are As you might imagine, certificates are incredibly common with secure Web pages When you go to eBay to sign in, your browser redirects to a secure Web page These are easy to identify by the lock icon at the bottom of the screen or in the address bar (Figure 11-13) or the https:// used (instead of http://) in the address bar EXAM TIP If you see https:// or a small lock icon, you are most likely on a secure Web site

The mbstowcs( ) function converts the multibyte string pointed to by in into a wide-character string and puts that result in the array pointed to by out Only size number of bytes will be stored in out In C99, out and in are qualified by restrict The mbstowcs( ) function returns the number of multibyte characters that are converted If an error occurs, the function returns 1 Example This statement converts the first four characters in the multibyte string pointed to by mb and puts the result in str:

Like a canister, a frame can hold only a certain amount of data Different networks use different sizes of frames, but generally, a single frame holds about 1500 bytes of data This raises a new question: what happens when the data to be sent is larger than the frame size Well, the sending system s software must chop the data up into nice, frame-sized chunks, which it then hands to the NIC for sending As the receiving system begins to accept the incoming frames, it s up to the receiving system s software to recombine the data chunks as they come in from the network I ll show how this disassembling and reassembling is done in a moment first, let s see how the frames get to the right system! When a system sends a frame out on the network, the frame goes into the hub The hub, in turn, makes an exact copy of that frame, sending a copy of the original frame to

A Private branch exchanges, or PBXs10-1 is a general-purpose switch It typically implements all telephony features and services internally, may connect any device to any other, and may support both standard and bridged appearances A PBX may be modeled as illustrated in Figure 10-5 Distributed PBX A distributed PBX is one that is implemented as a series of distinct PBX cabinets that may be located at some distance from one another The implementation of call processing functionality and switching

mbstowcs(str, mb, 4);

#include <stdlibh> int mbtowc(wchar_t *out, const char *in, size_t size);

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