The Basics of Cryptography
Cryptography is one of the most fundamental and widely used aspects of information technology, because without it, the modern world could not function. It refers to the encryption of data and communications, to secure both the sender and receiver of the information. As the internet grows into the global marketplace and becomes a central way of conducting business, cryptographers find their jobs growing rapidly as well. Cryptography is used not only by commercial organizations but by every person who have access to the internet.
Cryptography, also known as ‘cryptography’ or ‘encryption’, is the science and art of designing ciphers, keys and other forms of encryption to secure communication with others. This includes computer networks, electronic mail, telecommunications and any system which employ any form of communication, including peer-to-peer file sharing systems and the internet. A secret key is required for digital data to be transmitted securely over a network. In order to provide security to a network, a secret key is required by all users and administrators, to ensure that nobody else can make use of the network without the authorization of the user.
There are different ways of implementing cryptography, but the most common is a ‘cryptosystem’. A cryptosystem is a particular type of software application that is used to generate and manage the sets of encryption keys. Each user will have their own set of encryption keys and these keys will be stored on their personal computer or in a file. The use of such files is known as ‘public key infrastructure’.
However, there are some limitations of symmetric cryptography. For instance, a weakness of this system is revealed in the fact that an eavesdropper can listen to an entire conversation. However, with the use of modern technology and highly developed software, there are ways of making the most secure encryption more difficult to crack. One such method is called asymmetric cryptography. It uses the same key for encrypting and decrypting data, but uses a different one for the message. An example of such a system is digital certificates, which are much safer than conventional SSL.
Another form of asymmetric cryptography is known as public key infrastructure (PKI). This is a more advanced form of encryption and is based on the idea of digital signatures. Let’s assume that you want to send a document to your friend, who lives at a different country. In this case, you would want to encrypt the document with your friend’s public key, so that it could only be read by that person’s private key. However, in this case, if you were to make use of a public key infrastructure, you would be making your communication highly vulnerable and open to several attacks.
With a PKI system, all messages sent to a single public key server would be encrypted. Private keys would then be required for each message. Therefore, an email would not require two different keys, as messages could be encrypted and only the intended recipient could read them.
The main advantage of public key cryptography is that it is highly secure and well-guarded against hacking. Unlike the case of symmetric cryptography, public keys cannot be copied and altered. Also, in the case of highly sensitive information, it is vital that the information should be protected from unauthorized access. This is where public key cryptography comes into play.
As said earlier, the main aim of cryptography is to provide safe communications. However, computer experts also play an important role in ensuring that the security of a computer network is maintained. There are certain techniques that they use to protect a computer network from attack. Among these is called anti hacking software or firewall. When buying a computer or when installing new software, it is advisable that you buy one that has firewall support. It would give you ultimate protection against any form of malicious attack, especially against hackers.
