打屁股女生作文浅析计算机网络安全(英文-含中文翻译)

2021年1月18日发(作者：氨气喷泉实验)
X X X X 学 院
计算机专业英语














班级 计科

学号 12

姓名

日期 2015-12-






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Security of Computer Network System
Abstract: This paper discussed the secure and dependable problem about
the computer network system. On some aspects: the importance of network
security basic theory function and the method of solving a problem etc.
Good views for solving the problem are put forward. It strengthens
people’s consciousness on network security.
Key words: Computer network Virtual private network Encryption
techniques Firewall
Introduction: Along with the computer network technology development
the network security and the reliability have become the question of
common interest by all users. The people all hoped their own network
system can move reliably not external intruder disturbance and
destruction .Therefore solves the network security and the reliable
problem carefully is a guarantee the network normal operation’s premise
and safeguard.
First: the importance of the network security. With the information
developing fast today the computer network obtained the widespread
application but along with the network information transmission
capacity growing faster some organizations and departments benefit the
speed up with the service operation in the network while the data has
also suffered to extent attack and destruction. The aggressor may
intercept the information in the network steals the user’s password
the database information also may tamper with the database content the
forge users status denies own signature. And what is more the aggressor
may delete the database content the destroy node releases computer
virus and so on. This cause data security and own benefit have received
the serious threat. According to American FBI US Federal Bureau of
Investigation invest the network security creates the economic loss
surpasses 17 billion dollars every year.75 corporation report finance
。
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loss is because the computer system security problem creates. More than
50 safe threat come from inside. But only 59 loss could be possible
estimate. In China the economic loss amount in view of financial domain
and the bank negotiable securities computer system security problems
creates has reached as high as several hundred million Yuan also
sometimes occurs in view of other profession network security threat.
Thus it can be seen regardless of is the mean attack or unconscious
disoperation will all be able to bring the inestimable loss to the
system. Therefore the computer network must have the enough strong
security measure. Regardless of is in the local area network or in WAN
the network security measure should be Omni-directional in view of each
kind of different threat and the vulnerability so that it can guarantee
the network information’s secrecy the integrity and the usability.
Second: Network security rationale. International Standardization
Organization ISO once suggested the computer security the definition
was: “The computer system must protect its hardware the data not
accidentally or reveals intentionally the change and the destruction.”
In order to help the computer user discrimination and the solution
computer network security problem the American Department of Defense
announced “the orange peel book” orange book official name is
“credible computer system standard appraisal criterion” has carried
on the stipulation to the multiuser computer system security rank
division. The orange peel book from low to high divides into the
computer security four kinds of seven levels: D1 C1 C2 B1 B2 B3
allD1 level does not have the lowest safety margin rank C1 and the C2
level has the lowest safety margin rank B1 and the B2 level has the
medium safekeeping of security ability rank B3 and A1 belongs to the
highest security rating. In the network concrete design process it
should act according to each technology standard the equipment type
。
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the performance requirement as well as the funds which in the network
overall plan proposed and so on the overall evaluation determines one
quite reasonably the performance high network security rank thus
realization network security and reliability.
Third: The network security should have function. In order to adapt
the information technology development well the computer network
application system must have following function: 1 Access control:
Through to the specific webpage the service establishment access
control system in arrives the overwhelming majority attack impediment
in front of the attack goal. 2 Inspects the security loophole: Through
to security loophole cyclical inspection even if attacks may get the
attack goal also may cause the overwhelming majority attack to be
invalid. 3 Attack monitoring: Through to specific webpage service
establishment attack monitoring system but real-time examines the
overwhelming majority attack and adopts the response the motion for
example separation network connection recording attack process pursuit
attack source and so on. 4 Encryption Communication: Encrypts on own
initiative the communication may enable the aggressor to understand
the revision sensitive information. 5 Authentication: The good
authentication system may prevent the aggressor pretends the validated
user. 6 Backup and restoration: The good backup and restores the
mechanism may causes the losses when the attack as soon as possible
restores the data and the system service. 7 Multi-layered Defense: The
aggressor after breaks through the first defense line delays or blocks
it to reach the attack goal. 8 Sets up the safe monitoring center:
Provides the security system management the monitoring the protection
and the emergency case service for the information system.
Fourth: The network system safety comprehensive solution measures. If
want to realize the network security function we should carry on the
。
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Omni-directional guarding to the network system and thus formulate the
quite reasonable network security architecture. Below on the network
system security problem proposes some guard measure. Physics safe may
divide into two aspects: One is the artificial harm to the network the
other is the network to the users. Most common thing is the constructor
who did not understand to the buried cable clearly thus lead to the
destruction of electric cable this kind of situation may through
standing symbolized the sign guards against Has not used the structure
wiring the network to be able to appear the user frequently to the
electric cable damage this needs to use the structure wiring to install
the network as far as possible Artificial or natural disaster influence
when to consider the plan. The access control security the access
control distinguishes and confirms the user limits the user in the
already activity and the resources scope which is authorized. The
network access control safe may consider from following several aspects.
1 password: The network security system most outer layer defense line
is network users registering in the registration process the system
would inspect the user to register the name and the password validity
only then the legitimate user can enter the system. 2 The network
resources’ host the attribute and the visit jurisdiction: The network
resources mainly include the resources which shared files the shared
printer network users and so on that all the network users can use.
The resources were the host to manifest the different user to the
resources subordinate relations such as builder modifier and group
member and so on. The resources attribute expressed itself deposit and
withdrawal characteristics as can read by who write or the execution
and so on. The visit jurisdiction mainly manifests in the user to the
network resources available degree in using assigns the network
resources to be the host the attribute and the visit jurisdiction may
。
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effectively in the application cascade control network system security.
3 Network security surveillance: The network surveillance is generally
called for “the network management” its function mainly is carries
on the dynamic surveillance to the entire network movement and handles
each kind of event promptly. May understand simply through the network
surveillance discovers and solves in the network security problem such
as the localization network fault point seizes the IP embezzler the
control network visit scope and so on. 4 Audit and track: Network audit
and track which is including the network aspect resources use network
breakdown and system keeping. It composed generally by two parts: One
the recording event soon each kind of event entirely records in the
document. Two carries on the analysis and the statistics to.
Data transmission security, transmission security requirements to
protect the information on the network is transmitted to prevent the
passive and active violations. The security of data transmission can
take the following measures: (1) encryption and digital signature:
digital signature is the receiver of data used to confirm the sender
of the data is true and correct. (2) firewall: firewall (Firewall) is
a security measure that is widely used in Internet. It can be used to
set up a series of components in different network or network security
domain. It can detect, limit and change the data flow of the firewall,
and detect the information, structure and running status of the network
as far as possible, so as to realize the network security. (3) Username
or Password certification: the authentication method is the most
commonly used as an authentication method for the operating system,
telnet (remote login), rlogin (remote login), but the process is not
encrypted, that is, password is easy to be monitored and decryption.
(4) authentication using the algorithm: radius (Remote Authentication
Dial protocol, OSPF (open routing protocol), SNMP Security Protocol
。
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