CRYPTOGRAPHY.

Cryptography;This is the system of hiding texts. A science of encrypting and decrypting information in the form of text is the one so called cryptography. This topic is very important since it can be used in the security purposes for example in the provision of data confidentiality, integrity and electronic signatures.

The very interesting thing in this topic is about “Enigma”; this enigma is a type of cryptographic machine developed and used by Germany during the war especially in the World War II. The Germany military force used this machine to encrypt whatever the conversations they made with their troops so that no one else can understand whatever they were planning to do. By this technique they advanced a lot until the British scientist man Alan Touring came out with the machine which decrypted the codes made by this enigma machine.

In fact the discussion on this topic was good and it was very understandable to me. Since then I was able to know the common types of cryptography and the importance of them. There are several ways of classifying cryptography but in our discussion we sited on the two common types of cryptography based on number of keys employed for encrypting and decrypting namely “Secret key Cryptography” and the “Public Key Cryptography”.The secret key Cryptograph is the one which is common to us since the key used for encrypting is the same as the one used for decrypting for example in our daily life we use the same key for closing and opening things the same applied for this matter of locking and unlocking.

The interesting one is this is the public key cryptography were different keys are used for locking and unlocking the data. It is somehow difficult to make the imagination on how one key can be used for locking and another key used for unlocking data. In normal situation is difficult but for the case of computer it is quite easy. What is done here is that the data can be unlocked by a dedicated person only and no reply can be done since the key for unlocking can not be used for locking.

Although the cryptograph is very important to our life especially in the security purposes but there are some challenges which face the situation of hiding the data and information. Crackers are the worriers of the cryptograph, they tend to break the codes and read whatever is written. Also in other side to perform this thing it needs a skilled person whereby the connected people take the advantage.