Monday, April 24, 2017

Peer-to-peer

Peer-to-Peer network
A peer-to-peer network has no dedicated servers; instead, a number of workstations are connected together for the purpose of sharing information or devices. When  there is no dedicated server, all workstations are considered equal; any one of them can participate as the client or the server. Peer-to-peer networks are designed to satisfy the networking needs of home networks or of small companies that do not want to spend a lot of money on a dedicated server but still want to have the capability to share information or devices. For example, a small accounting firm with three employees that needs to access customer data from any of the three systems or print to one printer from any of the three systems may not want to spend a lot of money on a dedicated server. A small peer-to-peer network will allow these three computers to share the printer and the customer information with one another. The extra cost of a server was not incurred because the existing client systems were networked together to create the peer-to-peer network. The Microsoft term for a peer-to-peer network is a workgroup. Be aware that  peer-to-peer networks typically consist of fewer than 10 systems. Most of the modern operating systems such as Windows XP and Windows Vista  already have built-in peer-to-peer networking capabilities, which is why building a  peer-to-peer network would be a “cheap” network solution. The disadvantage of a  peer-to-peer network is the lack of centralized administration—with peer-to-peer networks, you need to build user accounts and configure security on each system.




Key stretching - explicação

Você pode fazer uma chave fraca se tornar mais forte ao executar múltiplos processos para a mesma chave. Por exemplo, você pode ter uma se...