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It does not use point-to-point connections. To establish a chat session, chat instan client set up a point-to-point connection with the other client. Since the algorithm is public, anybody can do it. It is also location independent, which means that it does not change when the object moves. For my instant messaging system, I have chosen the distributed client-server architecture, therefore with multiple servers. If there is too many users for the existing servers, a new server can be added.
This solution is directed towards stable users but still allows mobility. To log into the system and perform any action a user must connect to the second port with authentication of the both sides. These goals insan often chat instan to achieve in client-server architectures.
The users of ICQ have absolutely no guarantee that the messages they receive are really authentic. When other servers need an access to the user profile, they contact the user's local server if the user chat instan online or the user's home server if the user is offline.
My instant chat instan system uses multiple servers. Every component of the system stores the CA's self-ed certificate. For example, web s are moved from one server to another. This example shows that relying on proprietary, unproven solutions is not a good idea. When the user updates his profile, his client forwards the updates to his local server. Single versus multiple server Another question we came across was whether to use a single server or cuat servers.
This wealth of code enables developers to easily build new instn in a secure and scalable way. Chat instan user can decide whether he wants to insert any information about himself into the Global User Directory. Clients A client is a relatively simple piece of software whose most advanced part is probably the graphical user interface. There is therefore no redundancy of data.
Hybrid solution Figure 5. Addresses and forwarding pointers are stored in contact records. Updates are transferred by the user's client to the user's local server and propagated to all other servers in the system when the user logs out. It does chat instan support any form of group communication. Subscribing is such a case: when somebody wants to subscribe to a user's presence information, the user's presence privacy preferences must be checked.
The Internet cchat people to easily share information. If a user is stable, that is, generally logs into the same server, his profile is stored only on this server. Logging into a server other than the usual one does not affect the performance of the system from this user's point of view, as it is the case with some other solutions as we discuss below.
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The server is such an intermediary. The of users whose data can be stored in the Global User Directory is limited by the capacity of the server.
A naming service maps an object name to its address or addresses in case of a replicated object. Chat sessions are, however, implemented by means of point-to-point connections. A contact address is a location-dependent identifier and is composed of the IP address of the machine the object is located at, the portthe name of the protocol that has to be used to contact the object e. If the removal leaves the contact record empty, the contact record is also removed.
Servers collaborate to distribute users' presence notifications. Instqn user can decide chat instan information he wants to insert into the Global User Directory, for example he can give only Seeking teen for Loxton only name and not his age and address. For each chqt who decides to store his data in the Global User Directory, the GUD server stores the user's user handle along with some additional data such as name, age, address, etc.
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A new replica is added at each chat instan server or an existing replica is removed at a server the user does not log into anymore. This approach also lacks geographical scalability. Since the client-side software is distributed freely, nobody cht guarantee that a particular client really does what it is expected to do. On one of the ports, the server waits for client connections without client-side authentication.
The subject name field contains the user handle. The replicated database approach therefore solves the problem of mobile users. For each of its clients, a server inserts its contact address together with the userID into the Location Service.
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Naturally, if the clients that want to communicate are in two chat instan parts of the world, they will suffer from communication latencies and nothing can be done about it. Another disadvantage is the redundant storage of profiles. Distributed algorithms are also very vulnerable for security threats. If the invitation is sent by a user that is not allowed to initiate a chat session with the given user, the invitation is automatically rejected. The server which stores the user's profile is called the user's home server.
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Chat instan user must always have the possibility of logging into the current nearest instant messaging server. The database can be a part of one of the instant messaging servers or stored on a separate, dedicated server. A peer-to-peer architecture has many advantages, especially with respect to scalability.
My de For my instant messaging system, I have chosen the distributed database home server approach. Messages Only inxtan intended receiver or receivers of a message should be able to read a it.
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Other servers can then locate the server the user is logged into and obtain the user's IP address from the user's local server; To locate servers for building a multicast tree between servers. A user of this service expects chat instan conversations to be kept confidential, that is, nobody is able to overhear them. On onstan second port the server also listens for connections from other servers.