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The answer to the problem of key sharing came in the form of using two different keys, one to encrypt and one to decrypt, an asymmetric-key algorithm Three men in the late 1970s Whitfield Diffie, Martin Hellman, and Ralph Merkle introduced what became known as public-key cryptography, with which keys could be exchanged securely NOTE The public-key cryptography introduced by Diffie, Hellman, and Merkle became known as the Diffie-Hellman key exchange Hellman, on the other hand, has insisted that if the scheme needs a name, it should be called the Diffie-Hellman-Merkle key exchange Ron Rivest (along with Adi Shamir and Leonard Adleman) came up with some improvements to the Diffie-Hellman method of public-key cryptography by introducing a fully functional algorithm called Rivest Shamir Adleman (RSA) that enabled secure digital signatures Here s how public-key cryptography works Say we have two people, Mike and Melissa, who wish to send each other encrypted e-mail (Figure 11-6) SMTP doesn t have any (popular) form of encryption, so Mike and Melissa must come up with some program that encrypts their messages They will then send the encrypted messages as regular e-mail

CPE switching equipment can take many different forms Historically, switching products have been divided into four principal categories based on different underlying technologies and the resulting functionality These four types are: Front-end switch Key system unit (KSU) Private branch exchange (PBX) Application-specific switches (eg, ACD switch, etc) As all switch implementations evolved and came to be based on digital technology, features previously associated with only one type of device became easy to implement in any product, and the differences began to blur Most new switch implementations are capable of virtually any feature, so the categorization of switch products has become increasingly arbitrary Over time, the distinctions between switch types will continue to blur Any switch may include any or all of the telephony resources described in 3

#include <stdlibh> char *getenv(const char *name);

Figure 11-6

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The getenv( ) function returns a pointer to environmental information associated with the string pointed to by name in the implementation-defined environmental information table The string must not be changed by your code The environment of a program may include such things as path names and devices online The exact nature of this data is implementation defined You will need to refer to your compiler's documentation for details If a call is made to getenv( ) with an argument that does not match any of the environment data, a null pointer is returned Example Assuming that a specific compiler maintains environmental information about the devices connected to the system, the following fragment returns a pointer to the list of devices:

The size of a switch is fundamentally measured in terms of two independent characteristics: its capacity for connecting lines (trunks and extensions) and its capacity for handling calls A nonblocking switch is one that has enough capacity for calls that every line can be used simultaneously A switch can vary in line capacity from just two lines to thousands of lines The other important characteristic that differentiates switch designs is their ability to be upgraded, and the limits to that upgradability At the simplest level, a switch is simply a box, or cabinet, with a power supply and printed circuit boards Switches that cannot be upgraded in any way have a fixed number of ports to which trunk and extension lines can be attached A switch that can be upgraded may allow for the addition of entire auxiliary PBX cabinets, or for the addition of individual printed circuit boards to one or more shelves within the PBX cabinet Add-in circuit boards may provide additional telephony resources of any type Typically the cards will provide a set of additional trunk ports or extension ports of a given line interface type Other examples of possible add-in functionality include media access devices (ranging from new DTMF detectors to a voice mail system), an ACD device function, an upgrade to switching resources (ie, support for more conference calls), or a CTI interface

Page 451 char *p /* (/ p = getevn(''DEVICES");

EXAM TIP Public-key cryptography is the most popular form of e-mail encryption Before Melissa can send an encrypted e-mail to Mike, he first generates two keys One of these keys is kept on his computer (the private key) and the other key is sent to anyone from whom he wants to receive encrypted e-mail (the public key) These two keys called a key pair are generated at the same time and are designed to work together He sends a copy of the public key to Melissa (Figure 11-7)

#include <stdlibh> long int labs(long int num);

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