The Role of Cryptography in Secure Data Transmission

8/9/2019 The Role of Cryptography in Secure Data Transmission

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THE ROLE OF CRYPTOGRAPHY INSECURE DATA TRANSMISSION

S.VINILA KUMARIDEPT.OF COMPUTER SCIENCE

SRI VSSC GOVT.DEGREE COLLEGESULLURPET


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Outline

IntroductionCryptography Issues

Cryptography FunctionsCryptography AlgorithmsNew Trends in Cryptography

ConclusionReferences


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Introduction

Cryptography definitionNet work and Security Risks

Denial of Service attackirus

Tro!an "orse#orm

Cryptography $rinciples


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Cryptography Issues

Confidentiality

IntegrityNon%repudiationAuthentication


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Cryptography Functions

"ash Functions

Secret % &ey Cryptography$u'lic ( &ey Cryptography


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"ash Function)g*For e+ample ,o' received a hash

value of -. and decrypted amessage Alice had sent as

you are bei ! "o##o$e% u&eba'( roa%&) *urry +

"ashing algorithm will multiply thenum'er of a/s0 e/s and h/s in themessage and will then add thenum'er of o/s to this value1

23+4+-5647-8

#hich is different from the value -.that Alice sent


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Secret &ey Cryptography

)g*

,ee- ,e a- -*e roa%*ou&e a- oo ur!e - +If Alice and ,o' agree on a key of 90 the cipher te+t of Alice/s message will 'e ,ee*a earo-u-e-ou r--a&o!,*%eoe +:eetm)atth)road"ouseAtnooNurgent


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$u'lic &ey Cryptography1) Alice writes the message

2) Bob pulls Alice's public key o a public key ser!er

") Bob encrypts the message withAlice's public key

#) Bob sends the encrypted message toAlice

$) Alice recei!es the message

%) &sing her pri!ate key Alice decryptsthe message


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Cryptography Algorithms

Su'stitution CipherTransposition CipherThe D)S AlgorithmThe RSA Algorithm


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Su'stitution ; Transposition Cipher


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Su'stitution Ciphers


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Transposition Cipher

=nkeyed single transposition is oneof the simplest methods of

enciphering1 For e+ample0 themessage

TI:) IS


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The D)S Algorithm

$rotecting sensitive commercialand unclassified dataD)S works on 84 'it data at atime)ach 84 'it data is iteratedfrom - to -8 times

'its for error detection and98 'it key system for securitypurposesThe uni ue key chosen forparticular application=nauthori>ed recipients can notderive the original dataalgorithmically


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The RSA Algorithm

There are three phases-1 Determination of pu'lic and

private keysChoose two large primes0 Pand Q1Compute N = P * Q 1Compute F2n5 7 2$ % -52E % -51

1 )ncrypting a messageCompute C = Me (Mod N)

31 Decrypting a message

Compute Cd (Mod N) = M


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New Trends in Cryptography

)lliptical Curve CryptographyEuantum Cryptography


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)lliptical Curve CryptographyFaster0 smaller and more efficientcryptographic keys

enerate keys elliptical curvee uation instead of product of largeprime num'ers

)CC can yield a level of securitywith a -84%'it key)CC used lower computing powerand 'attery resource usage)CC is 'ased on properties of aparticular type of creation derivedfrom points 1

:ultiplying a point on the curve 'ya num'er will produce anothernum'erIt is easy to perform


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Euantum Cryptography

Ne+t enerationCommunications aretransmitted 'y assigning digital

>ero or one signal to eachphoton or so called Ggrains oflightH The signals are e+pressed thestrength and weak of the lightThe information carried 'y

photons is instantly 'roken ifthe communication is o'served


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Conclusion

)volution of Cryptography follow the paceof technology closely1Types of algorithms to estimate correctalgorithm according to our re uirementCryptography functions is used to protectour data at the time of transmissionNew trends in cryptography is used totransmit data fastly and easily


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References:inoli0 Deniel and :inoli0 )mma1 #e' Commerce Technology

"and'ook1New Delhi0 Tata :c raw%"ill )dition0 - 1Tanen'aum0 Andrew S1 Computer Networks1 3rd ed1 New Delhi0 $rentice%"all ofIndia0 - .1Joung0 :argaret Bevine0 The Complete Reference Internet :illennium )dition0New Delhi0 Tata:c raw%"ill )dition0 - 1

reenlaw Raymond and "epp )llen1 In%lineK


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The Role of Cryptography in Secure Data Transmission