For hackers and criminals, these are two more ways in which they illegally infiltrate a computer system. 'Spoofing' has become increasingly popular as a common method of manipulating financial information through fake websites. A spoofed site is a mirror image close to the actual site, and unless a user observes the spoof closely, he or she will not notice its presence. At the moment, users provide important personal and financial information. On the other hand, sniffing is a popular method of picking up information while passing through the transmission line. Sniffing is usually done in solid wire or wireless systems. Sniffing is almost impossible to detect. So data encryption is the only way to protect against it.