28-07-2012, 05:07 PM
CRYPTOGRAPHY
CRYPTOGRAPHY-UD.pptx (Size: 562.97 KB / Downloads: 54)
INTRODUCTION
Cryptography is where security engineering meets mathematics. Cryptography includes techniques such as microdots, merging words with images, and other ways to hide information in storage or transit. However, in today's computer-centric world, cryptography is most often associated with scrambling plaintext into cipher-text ,then back again. Individuals who practice this field are known as cryptographers.
HISTORY:-
Before the modern era, cryptography was concerned solely with message confidentiality(i.e., encryption)—conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for decryption of that message). Encryption was used to (attempt to) ensure secrecy in communications, such as those of spies, military leaders, and diplomats.
DISADVANTAGES OF CRYPTOGRAPHY:-
Transmission time for documents encrypted using public key cryptography are significantly slower then symmetric cryptography.
Transmission of very large documents is prohibitive.
The key sizes must be significantly larger than symmetric cryptography to achieve the same level of protection.
CONCLUSION:-
From e-mail to cellular communications, from secure Web access to digital cash, cryptography is an essential part of today's information systems.
It can prevent fraud in electronic commerce and assure the validity of financial transactions.
And in the future, as commerce and communications continue to move to computer networks, cryptography will become more and more vital.
CRYPTOGRAPHY-UD.pptx (Size: 562.97 KB / Downloads: 54)
INTRODUCTION
Cryptography is where security engineering meets mathematics. Cryptography includes techniques such as microdots, merging words with images, and other ways to hide information in storage or transit. However, in today's computer-centric world, cryptography is most often associated with scrambling plaintext into cipher-text ,then back again. Individuals who practice this field are known as cryptographers.
HISTORY:-
Before the modern era, cryptography was concerned solely with message confidentiality(i.e., encryption)—conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for decryption of that message). Encryption was used to (attempt to) ensure secrecy in communications, such as those of spies, military leaders, and diplomats.
DISADVANTAGES OF CRYPTOGRAPHY:-
Transmission time for documents encrypted using public key cryptography are significantly slower then symmetric cryptography.
Transmission of very large documents is prohibitive.
The key sizes must be significantly larger than symmetric cryptography to achieve the same level of protection.
CONCLUSION:-
From e-mail to cellular communications, from secure Web access to digital cash, cryptography is an essential part of today's information systems.
It can prevent fraud in electronic commerce and assure the validity of financial transactions.
And in the future, as commerce and communications continue to move to computer networks, cryptography will become more and more vital.