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largest dial-up providers in the United States, the company had to look at new ways of providing content It started AIM, or AOL Instant Messenger, which was conceived as a way to find people of like interests online, and it was modeled after earlier chat programs With GUI features and enhanced ease of use, it quickly became popular enough for AOL to release to regular users of the Internet With several competing programs, AIM was feeding the tremendous growth of the instant messaging segment The programs had to appeal to a wide variety of users, so ease of use was paramount, and security was not a priority Now that people are accustomed to instant messaging applications, they see the benefit of using them not only for personal chatting on the Internet, but also for legitimate business use When people install these applications, they unwittingly expose the corporate network to security breaches Instant messages traverse the Internet in plaintext and also cross third-party servers be it MSN, Google, or AOL Instant messaging programs are designed to attach to a server, or a network of servers, and allow you to talk with other people on the same network of servers in near real time The nature of this type of communication opens several holes in a system s security First, the program has to attach to a server, typically announcing the IP address of the originating client This is not a problem in most applications, but instant messaging identifies a specific user associated with the IP address, making attacks more likely Also associated with this fact is that for other users to be able to send you messages, the program is forced to announce your presence on the server So now a user is displaying that his or her computer is on and is possibly broadcasting the source IP address to anyone who is looking This problem is compounded by the tendency for people to run these programs in the background so that they don t miss any messages Popular instant messaging clients were not implemented with security in mind All support sending files as attachments, few currently support encryption, and they do not have a virus scanner built into the file-sharing utility File sharing in any form must be a carefully handled application to prevent the spread of viruses and other malicious code Chat programs produce security risks because the sharing is done ad hoc between end users, administrators have no control over the quality of the files being sent, and there is no monitoring of the original sources of those files The only authentication for the files is the human interaction between the two users in question This kind of vulnerability coupled with a social engineering attack can produce dramatic enough results for Computer Emergency Response Team (CERT) to issue an incident note (CERT Incident Note IN-2002-03: Social Engineering Attacks via IRC and Instant Messaging) This personal type of authentication was abused, tricking people into downloading and executing backdoor or Trojan horse programs A user can also be persuaded autonomously to download and run a file via IM Several worms exist that attempt, via IM, to get users to download and run the payload W32pipeline uses AIM to install a rootkit Goner, running via ICQ, asks users to download a screen saver Choke, spreading via MSN, attempts to get users to download a game; if the game is downloaded, the worm will attempt to spread to any user the infected user chats with These worms and others all depend on user interaction to run the payload This file sharing mechanism bypasses all the server-side virus protection that is part of most organizations e-mail infrastructure This pushes more of the re-.

8-1-2 Characteristics of Data We begin by describing the characteristics of data elements The most important description of a data element are its name and its domain These are familiar concepts to any programmer

Programming languages have always provided facilities to name and characterize data elements The domain of a data element, needed for computation, is mostly given as the type and perhaps the length Some modern languages permit further speci cations Other characteristics, for instance, the largest and smallest value expected, are de ned implicitly or in the program documentation For the database complete and explicit descriptions are advantageous

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In addition to the media stream data that is conveyed over transmission facilities using media stream channels, the switching network must establish communication mechanisms for signaling information Signaling includes command and control information such as: Signals to reserve the use of a media stream channel and to indicate the presence of a new call on a media stream channel; Commands from telephone station equipment to execute services; and Physical element control and status information for each connected telephone station on lines that allow a switch to detect and control telephone station equipment Additionally, call associated information, including the following, may need to be conveyed: Direct Inward Dialing (DID) CallerID ANI DNIS Correlator data User data

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We will present the quantitative characteristics of data elements type or domain, length, conditionals, count in this subsection Qualitative speci cations of data element characteristics are presented in Sec 8-1-3 The number of attributes used to describe each type of data element is su ciently large that we may keep the schema itself as a relation Names have been used throughout to de ne attributes in records and relations The name given to a data element by a programming language is restricted by fairly simple rules These rules generally allow a short, variable length string of alphabetic and numeric characters; the rst character has to be alphabetic This string is easily parsed or separated from other elements that make up the statements accepted by the schema language Compatibility between the programming language and the schema language is desirable If multiple languages are used, the sum of compatibilities can restrict names unduly Names used in les and databases are global; ie, they are bound to their meaning over all programs while the les or database is open The schema will be used by many programs over a long time In programming languages a name can have a di erent de nition as the process changes scope In a database the scope of a name of a data element is a ected only by structural scope, the name is de ned within the database or relation that contains the data element To locate the values, the position or byte number within the record is kept associated with the names in the schema If the eld allocation is exible, an approach as seen in a pile le may be used A coded name is kept with each element in the record The schema keeps the codes with the names to allow translation from name to code and vice versa Most schema language translators will assign positions only according to their own data allocation methods Some languages permit the users to specify the position explicitly so that the schema can be applied to previously existing les.

Finally, in a distributed switching network the distributed elements of the switching control function must communicate with one another to coordinate their activity These different types of control and call associated information may be communicated in-band or out-of-band In-Band Signaling In-band signaling refers to a technique in which commands and information share the media stream channel for a particular call The information is encoded as breaks in the channel, special tones or tone sequences, or modulated data A significant disadvantage of in-band signaling is that the contents of the actual media stream can be mistaken for signaling information8-1 Out-of-Band Signaling Out-of-band signaling refers to techniques where separate electrical circuits or separate signaling channels are used to keep control and status information separate from media stream information (See sidebar ''Multiplexing" on page 405)

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