Data Encryption

From the very beginning of humankind , people have always been concerned upon the security of their belongings . In the olden days the possessions ' ranged from farm goods to their livestock and the constant threats were wolves or thieves in the surrounding area . The securities for their possessions were usually guard dogs and they relied heavily on them . As time went on the possessions of people changed as well the security measures they applied . As we step into the modern era i .e . the 21st century the security is becoming more and more difficult

br because the use of technology has become a common use both for the good and the bad purposes . Burglar alarms are used commonly in houses nowadays but could be disabled easily . Likewise car security has also become a troubling thing for a common man too . The most disturbing thing is that these security breaches are not limited to the common man only but top-level government agencies too have suffered from these security breaches . According to a report published in FT .com (financial times ) in September 3 ,2007 , American officials have accused the Chinese military to have hacked into a Pentagon network in June , and is described as the most successful cyber attack on the security of the US defense department . Although Chinese officials have rejected the accusations of the US but still security breaches of this level are not unheard of there are various reported incidents of breaches of the same kind done by hackers or hack-groups . So the situation is really troubling as by hacking into a government 's military organization their military secrets etc . can easily be stolen and far worse can be used on them even . In this era of modern technology 100 security may not be possible but still a maximum-security measure can be installed

Cryptography is a method of hiding important information from the unwanted eyes . This technique of hiding information is a very old one and has been in use for centuries now but it has evolved as the need of man evolved too i .e . now cryptography is used in technologically advanced societies for securing information which is transferred electronically e .g . ATMs etc . when we talk about cryptography , classic cryptography is the most commonly used method for data encryption (hiding data . Classic cryptography uses a table called the translation table ' which is the most basic method of classic cryptography . The translation table actually makes use of a segment of data , usually one byte as an offset within the table and the result that comes after this process is then incorporated into the output value . The result is that the true data is now in the form of gibberish i .e . it makes no sense at all . To decipher the encrypted data again the translation table once again has to be used and this time the translation table is used in the reverse . So basically the encryption and the decryption programs can be translated using data . To get a...