Download Code hacking : a developer’s guide to network security by Richard Conway PDF

By Richard Conway

Developer's consultant to community safety presents a hands-on method of studying the very important safeguard talents. It information the software program and methods hackers use and offers useful insights on what is relatively vital in figuring out hacking matters. The booklet cuts during the cursory concerns and speedy delves into the necessities at a code and implementation point. It teaches clients easy methods to write and use scanners, sniffers, exploits, and extra. It additionally is helping builders write community defense attempt harnesses for program and infrastructure. additionally, it covers tips to create passive safeguard innovations to gather info on hackers, in addition to the way to use energetic security thoughts via options equivalent to penetration checking out. in contrast to different books on hacking, Code Hacking takes a different procedure that covers hacking concerns utilizing various languages. software program causes and code samples are supplied in C#, C++, Java, and Perl, permitting builders to benefit from a number of views. The spouse CD-ROM includes a customized protection scanner written in C#. This scanner is a mix of a port and vulnerability scanner that scans IP addresses, permits definite companies to be "brute forced," and exploits recognized vulnerabilities.

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Additional resources for Code hacking : a developer’s guide to network security

Example text

255. 3, are set aside for specific reasons. 255 are reserved for loopback addresses. If a datagram is sent to a loopback address, it never leaves the local machine. It is used to test that the TCP/IP software is functioning correctly. 255 are set aside as private addresses and should not be exposed on a public network such as the Internet. A public address must be unique across the entire public network, as without this rule it would be impossible to identify hosts. A private address need only be unique across the network on which it resides.

To achieve this, IP addresses have an associated subnet (work) mask that is also a 32-bit number. When an IP address is masked against a subnet mask, the network ID is revealed. Subnet masks are also expressed in dotted decimal notation. 25 is one of 16,777,216 (less two for the network and broadcast addresses) possible hosts on the network. 0. 4 shows that the first 8 bits are the network address. 4 Subnet Mask, IP, and Network ID Comparisons IP address 00001010000000100000001000011001 Subnet mask 11111111000000000000000000000000 Network ID 00001010000000000000000000000000 Now, taking the example of a company that only wants a handful of addresses, we can start with a class C address and borrow host bits with the subnet mask until we have the required number of hosts.

2. Alice knows from using the subnet mask that Bob is not on the same network. 3. Therefore, Alice must send the datagram to the default gateway for it to deal with the request. 4. Alice knows the IP address for the default gateway, so she can send an ARP request for the physical address. 5. When this is received, the datagram is sent to the gateway. The important bit here is that the physical address is for the gateway but the destination IP address is Bob’s. When the gateway receives the datagram, it looks to see if Bob is on any of its local networks (for gateways by definition must have at least two local networks).

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