05-12-2011, 07:31 PM
pls..
send me..
it's so so important...
05-12-2011, 07:31 PM
pls.. send me.. it's so so important...
06-12-2011, 09:28 AM
to get information about the topic "cryptography" refer the link bellow https://seminarproject.net/Thread-crypto...ull-report https://seminarproject.net/Thread-crypto...ort?page=2
07-12-2011, 07:53 PM
hai..
i want seminar topic of magnetohydrodynamic power generation technology with abstract.
08-12-2011, 09:40 AM
to get information about the topic "cryptography" refer the link bellow
https://seminarproject.net/Thread-crypto...ull-report https://seminarproject.net/Thread-crypto...ort?page=2
19-01-2012, 11:04 AM
to get information about the topic cryptography full report fullreport,ppt and related topic refer the link bellow
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28-07-2012, 05:05 PM
CRYPTOGRAPHY
CRYPTOGRAPHY 12.pptx (Size: 307.39 KB / Downloads: 18) Introduction “Hidden Writing” & “Secret Communications” Increasingly used to protect information Can ensure confidentiality Integrity and Authenticity too Ensures the secrecy of information History – The Modern Era Computers! Gave cryptographers vast resources for improving the complexity of cryptosystems as well as for attacking them spread beyond its traditional uses in military and government applications. TERMINOLOGY Cryptosystem – The combination of algorithm, key, and key management functions used to perform cryptographic operations Cryptoanalysis- decryption without the knowledge of encryption Plaintext – A message in its natural format readable by an attacker Ciphertext – Message altered to be unreadable by anyone except the intended recipients Encryption Systems Substitution Convert one letter to another Cryptoquip Transposition Change position of letter in text Word Jumble Monoalphabetic Algorithm that substitutes one letter in the ciphertext alphabet for one in the plaintext alphabet HASHING It is basically a function that can take an arbitrary-length message and return fixed length message called DIGEST And when we encrypt the digest with private key of sender we get the SIGNATURE Cryptanalysis The study of methods to break cryptosystems Often targeted at obtaining a key Attacks may be passive or active
21-08-2012, 01:18 PM
Cryptography
report on cryptography.docx (Size: 260.58 KB / Downloads: 27) ABSTRACT The requirement of information security within an organization has under gone two major changes in the last several decades. Before the widespread use of data processing equipment, the security of information felt to be valuable to an organization was provided primarily by physical and administrative means. With the introduction of computer, the need for automated tools for protecting files and other information stored on the computer became evident. This is especially the case for a shared system, such as a time-sharing system, and the need is even more acute for system that can be accessed over public telephone network, data network, or the Internet. Cryptography is the study of mathematical techniques related to aspects of information security, such as confidentially or privacy, data integrity and entity authentication. Cryptography is not only means of providing information security, but rather one set of techniques. Confidentially means keeping information secret from all but those who authorized to see it. Data integrity means ensuring information has not been altered by unauthorized or unknown means. Introduction Due to the rapid growth of digital communication and electronic data exchange information security has become a crucial issue in industry, business and administration Cryptography is a physical process that scrambles information by rearrangement and substitution of content, making it unreadable to anyone except the person capable of unscrambling it. With the shear volume of sensitive Internet transactions that occur daily, the benefit of securing information using cryptographic processes becomes a major goal for many organizations. Since no cryptographic system is foolproof, the idea is to make the cost of acquiring the altered data greater than the potential value gained [3:27]. Essentially, it becomes an issue of deterrence. Definition of Cryptography Cryptography is the study of mathematical techniques related to aspects of information security, such as confidentially or privacy, data integrity and entity authentication. Cryptography is not the only means of providing information security, but rather one set of techniques. Cryptography Cryptographic systems are characterized along three independent dimensions. The type of operations used for transforming plain text to cipher text. All encryption algorithms are based on two general principles: substitution, in which each element in the plaintext (bit, letter, group of bits or letters) is mapped in to another element, and transposition, in which elements in the plaintext are rearranged. The fundamental requirement is that no information be lost. Most systems, referred to as product systems, involve multiple stages of substitutions and transpositions. The number of keys used. If both sender and receiver use the same key, the system is referred to as symmetric, single-key, secret-key, or conventional encryption. If the sender and receiver each use a different key, the system is referred to as asymmetric, two-key, or public-key encryption. Conclusion :- By analysis of this report and their subtopics which are mentioned above, which are inherently guides us about various cryptographic techniques used in data security. By using of encryption techniques a fair unit of confidentiality, authentication, integrity, access control and availability of data is maintained. Using cryptography Electronic Mail Security, Mail Security, IP Security, Web security can be achieved. |
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