Information theory can be defined as the mathematical aspect of processing data so that it can be communicated across different media. Such data processing can be compression of computer files, error-correcting codes such as those used in DVD players, digital television, etc…
In the present context, with the advent of computers in every aspect of daily routines of individuals and organizations in the 21st century, large amounts of information have to stored in or transmitted through unsafe media. It becomes essential that such information is not accessible to those who are not privy to it. Thus, to this effect of lending exclusivity to information stored or transmitted, the science of cryptography today has pervaded all areas of information technology today.
Towards these ends three types of cryptographic schemes are generally used today. The algorithms utilized in these schemes are described by the number of keys used to encrypt and decrypt data and additionally by their applications.
Public Key Cryptography (PKC) - These are asymmetric algorithms that use two keys - one key to encrypt and another to decrypt. One key is called the public key which may be advertised to all and sundry while the other is called the private key and this is only available to privy entities. It does not matter which key is used to encrypt or decrypt but the end-effect is the encryption allows the information to remain exclusive.
Hash Function (One-Way Cryptography) - These algorithms have no key and they allow the plaintext to be encrypted once into ciphertext that is not recoverable. These algorithms are usually used to provide a digital fingerprint of data and act as proof that the data has not been altered by unauthorized entities including viruses. Often, these algorithms that primarily prove the integrity of the information encrypt passwords. (Kessler, Gary C., 1998)
It should be noted that the above schema have been treated rudimentarily. There are numerous examples of each type of algorithm that are being used regularly in the information technology world but these too have been kept beyond the purview of this paper.
Cryptography also serves some security requirements specific to application-to-application communications in the information technology world.
It serves to authenticate the users' identity. It should be noted in this context that the most widely used network in use today in the world - the Internet - has very weak host-to-host authentication in the forms of name or address based identity.
It serves to maintain privacy and confidentiality by ensuring that only intended users have access to the relevant information. Both the sender and the receiver are reassured of these.
It serves to non-repudiate - it authenticates that the sender really sent the message. (Kessler, Gary C., 1998)
Cryptography is such a vast science today that if this paper was to treat to any extent all the concepts inherent within it this paper would take the semblance of a mere glossary of terms. Thus, to avoid such low ...
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(Information Theory and Cryptography Essay Example | Topics and Well Written Essays - 2750 Words)
“Information Theory and Cryptography Essay Example | Topics and Well Written Essays - 2750 Words”, n.d. https://studentshare.net/technology/298092-information-theory-and-cryptography.
This process is also known as cryptosystem. In cryptography, the message is known as plaintext, then the message is scrambled to conceal the message, this process of scrambling the message is called encryption. After this process of scrambling the message, the message version becomes ciphertext (Coutinho, 2003).
The main danger is regarding the communications that are offered nowadays mainly through the internet. The internet offers vital communication among tens of millions of people also is being more and more utilized like a tool intended for commerce. The security of the communication turned out to be an extremely significant matter to deal with.
In this scenario, the public key part is used for encryption entirely at the receiver side, whose private key part is applied for decryption. However, in order to make this communication safe it is necessary to make sure that only the intended receiver is able to access the private part of the key.
The protection of such information as bank account statements, credit card numbers, personal information, government documents, and trade secrets remain a critical part of information security. Confidentiality of information relates to safeguarding of information from disclosure to unauthorized parties (Feruza and Kim 2007, pp.19).
In this rapidly changing digital world of advanced hackers, new prevention techniques are invented for maximum prevention along with minimizing risks. One cannot predict that the blowfish encryption algorithm will also be replaced by the new and more secure algorithm known as (Anonymous2007, 500-500) two fish that will also be replaced at some period of this information age.
Shannon, In the beginning Shannon was not initially aware of this similarity, and later commented on it upon publicizing information theory in A Mathematical Theory of Communication. In my paper I will explores what links there are between the two different concepts, and how far they can be regarded as connected in practical and theory.
Information and Computer Technology has facilitated countless aspects of the business process and has automated numerous work tasks. Its adoption by organisations and its subsequent integration into the business process have proven invaluable. At the same time, however, it has led to countless security issues and, as a rule of thumb, has imposed the imperatives of adopting cryptographic techniques and technologies by organisations who engage in any form of online commerce or which have an online presence.
One cannot predict that the blowfish encryption algorithm will also be replaced by the new and more secure algorithm known as (Anonymous2007, 500-500) two fish that will also be replaced at some period of this information age. Security requires constant and periodic changes to