Securing Client/Server Transactions

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Securing Client/Server Transactions

Securing Client/Server Transactions
Securing Client/Server Transactions
The three basic ways that security is implemented in the area of client/server transaction. The first area is firewalls. The basic idea of a firewall to monitor traffic from a trusted network ( a companys internal network) to an untrusted network (such as the Internet). Firewalls fall into two categories, proxies and packet-filtering firewalls. Packet-filtering determines whether a packet is allowed or disallowed depending on the source of the packet and the contents of it. Packet-filtering also looks at the source and destination ports, and to determine if a packet is part of an ongoing conversation.
An application-level firewall, better known as a proxy acts as an intermediary between the client and the server. The client application connects to the proxy. The proxy opens a connection to the server and passes information back and forth between the server and the client (refer to Figure 1.).
Figure 1.
Both firewalls have their advantages and disadvantages. In most cases both categories will be implemented on the same firewall. A packet-filtering firewall tends to be less secure than a proxy based firewall, since complete knowledge of the protocol is used by the application. However packet filtering can allow a concept known as masquerading. Masquerading is when the firewall takes the outgoing source address on the packets and converts the address so the receiver thinks they are talking to the firewall. The receivers packets will have its address on it coming back so the firewall can determine which sender gets the packet. The advantage of masquerading is that a companys internal network can be hidden behind the firewall.
Another security implementation is encryption. Encryption is the process of modifying information so that it can not be read by anyone except the intended recipient. This is done by applying mathematical algorithms that require a key to unlock, or decrypt, the original data. Algorithms that use the same key to encrypt and decrypt data are known as symmetric encryption algorithms. Algorithms that use different keys to encrypt and decrypt data are known as asymmetric or public-key encryption algorithms. Encrypted data comes in two forms 40-bit and 128-bit. 40-bit encryption uses a 40 bits of space to encrypt data and 128 bits of space for the 128-bit form.
The process of verifying the senders identity is known as ...

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