Sunday, 1 July 2012
Firewall hacking
Now days, almost all networks have firewalls installed to protect them from the dangers of the un-trusted outside world of the Internet. When firewalls first came to the scene, they were nowhere near good enough to protect the Network completely. However, with the passage of time, the quality of firewalls has increased to such a level that the present day firewall systems make the internal trusted network almost 100% safe.
They can easily be configured to allow only certain kinds of data to pass through and even can be used to set which ports can be accessed from the un-trusted network (Internet) and which ports are accessible from the internal trusted network. Some good ones also scan all attachments going in and out for viruses and ensure that no confidential data is going out of the company. The present day firewalls have really made life quite easier for the system administrating by giving more than a little protection from the Outside world. However, one area where the firewalls falter is if the attach is from within the trusted internal network or in other words, the attacker is doing something wrong, something which he is not supposed to do from within the network and not through the Internet.
They can easily be configured to allow only certain kinds of data to pass through and even can be used to set which ports can be accessed from the un-trusted network (Internet) and which ports are accessible from the internal trusted network. Some good ones also scan all attachments going in and out for viruses and ensure that no confidential data is going out of the company. The present day firewalls have really made life quite easier for the system administrating by giving more than a little protection from the Outside world. However, one area where the firewalls falter is if the attach is from within the trusted internal network or in other words, the attacker is doing something wrong, something which he is not supposed to do from within the network and not through the Internet.
Email Hacking
When you send an e-mail from your computer, the data is sent from your computer
to an SMTP server. The SMTP server then searches for the correct POP3 server and sends your
e-mail to that server, where it waits until your intended recipient retrieves it
to an SMTP server. The SMTP server then searches for the correct POP3 server and sends your
e-mail to that server, where it waits until your intended recipient retrieves it
E-mail accounts are available through many different sources. When you get an e-mail account, you will be
given a two part e-mail address, in this form: username@domain.name. The first part,
username identifies you on your network, differentiating you from all the other users on the
network. The second part, domain.name is used to identify your specific network. The
user name must be unique within your network, just as the domain name must be unique
among all the other networks on the Internet
given a two part e-mail address, in this form: username@domain.name. The first part,
username identifies you on your network, differentiating you from all the other users on the
network. The second part, domain.name is used to identify your specific network. The
user name must be unique within your network, just as the domain name must be unique
among all the other networks on the Internet
Protocols
- POP (Post office protocol)
- SMTP (simple mail transfer protocol)
SMTP -------------> used to send emails
POP ---------------> used to receive emails
Sender ------------> Source mail server --------> interim mail server
--------->Destination mail server --------->Destination inbox
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