Cryptography And Network Security ppt
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lakshmi ravuri
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25-05-2010, 11:42 PM

hi i am lakshmi.i want the topic which is described above in title.i.e.,
cryptography and network security full report
CRYPTOGRAPHY and NETWORK SECURITY ppt for seminar and presentation purpose
computer science topics
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08-06-2010, 01:25 PM

hey lakshmi ravuri
please read for getting more information of CRYPTOGRAPHY and NETWORK SECURITY

i hope you enjoyed it
and come again for helping other students issues in this forum
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
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01-11-2010, 11:41 AM

.ppt   firewall.ppt (Size: 207 KB / Downloads: 353)
Cryptography and Network Security


seen evolution of information systems
now everyone want to be on the Internet
and to interconnect networks
has persistent security concerns
can’t easily secure every system in org
need "harm minimisation"
a Firewall usually part of this
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07-11-2010, 03:24 PM

Quantum Cryptography:
Quantum cryptography uses quantum mechanics to guarantee secure
communication. It enables two parties to produce a shared random bit string known only
to them, which can be used as a key to encrypt and decrypt messages. An important and unique property of quantum cryptography is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental part of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold a key
can be produced which is guaranteed as secure, otherwise no secure key is possible and
communication is aborted.The security of quantum cryptography relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the
computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping or guarantee of key security. Quantum cryptography is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt and decrypt a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key.

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16-02-2011, 12:23 PM

hi, everyone this is jessica.... can any one, send me "Network security and Cryptography" ppt and abstract by evening 4pm please... thank you
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19-01-2012, 11:05 AM

to get information about the topic cryptography full report fullreport,ppt and related topic refer the link bellow and presentation-report and presentation-report-on-quantum-cryptography and presentation-report?page=2
seminar paper
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13-02-2012, 01:21 PM

to get information about the topic cryptography and network security project and implimentations full report ,ppt and related topic refer the link bellow
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01-11-2012, 01:15 PM

Cryptography and Network Security

.ppt   Cryptography.ppt (Size: 920 KB / Downloads: 27)

.ppt   Cryptography and Network.ppt (Size: 298 KB / Downloads: 32)

.ppt   Cryptography and Network Security.ppt (Size: 1.09 MB / Downloads: 27)

.ppt   Cryptography1.ppt (Size: 259.5 KB / Downloads: 52)

.ppt   Cryptography2.ppt (Size: 647.5 KB / Downloads: 22)

.ppt   Cryptography3.ppt (Size: 707.5 KB / Downloads: 21)

.ppt   Cryptography and Network 1.ppt (Size: 496 KB / Downloads: 21)

.ppt   Cryptography and Network 2.ppt (Size: 216.5 KB / Downloads: 37)

.ppt   Cryptography and Network 3.ppt (Size: 465 KB / Downloads: 29)

.ppt   Security.ppt (Size: 672.5 KB / Downloads: 22)

.ppt   Network Security.ppt (Size: 439.5 KB / Downloads: 24)

.ppt   Network Security2.ppt (Size: 541.5 KB / Downloads: 34)

.ppt   Network 3.ppt (Size: 206.5 KB / Downloads: 21)

.ppt   Network 1.ppt (Size: 542 KB / Downloads: 19)

.ppt   Network2.ppt (Size: 539 KB / Downloads: 37)


The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable.


Information Security requirements have changed in recent times
traditionally provided by physical and administrative mechanisms
computer use requires automated tools to protect files and other stored information
use of networks and communications links requires measures to protect data during transmission


Computer Security - generic name for the collection of tools designed to protect data and to thwart hackers
Network Security - measures to protect data during their transmission
Internet Security - measures to protect data during their transmission over a collection of interconnected networks

Aim of Course

our focus is on Internet Security
which consists of measures to deter, prevent, detect, and correct security violations that involve the transmission & storage of information

OSI Security Architecture

ITU-T X.800 “Security Architecture for OSI”
defines a systematic way of defining and providing security requirements
for us it provides a useful, if abstract, overview of concepts we will study

Aspects of Security

consider 3 aspects of information security:
security attack
security mechanism
security service

Security Attack

any action that compromises the security of information owned by an organization
information security is about how to prevent attacks, or failing that, to detect attacks on information-based systems
often threat & attack used to mean same thing
have a wide range of attacks
can focus of generic types of attacks

Security Service

enhance security of data processing systems and information transfers of an organization
intended to counter security attacks
using one or more security mechanisms
often replicates functions normally associated with physical documents
which, for example, have signatures, dates; need protection from disclosure, tampering, or destruction; be notarized or witnessed; be recorded or licensed

Security Services (X.800)

Authentication - assurance that the communicating entity is the one claimed
Access Control - prevention of the unauthorized use of a resource
Data Confidentiality –protection of data from unauthorized disclosure
Data Integrity - assurance that data received is as sent by an authorized entity
Non-Repudiation - protection against denial by one of the parties in a communication

Model for Network Security

using this model requires us to:
design a suitable algorithm for the security transformation
generate the secret information (keys) used by the algorithm
develop methods to distribute and share the secret information
specify a protocol enabling the principals to use the transformation and secret information for a security service

Model for Network Access Security

using this model requires us to:
select appropriate gatekeeper functions to identify users
implement security controls to ensure only authorised users access designated information or resources
trusted computer systems may be useful to help implement this model

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