Data security means maintaining data safe, and much attention has been posed on computer systems by both individual and business computer users at home and abroad. Under the circumstance where confidential and vital data in computer have been lost, damaged, or stolen, users will suffer a lot from data losses like economic losses. There exist a tremendously large number of factors which may pose threat to data safety including the following ones: 1. If system crashes, there is every chance that data get lost or damaged severely. 2. Data in computer are likely to become corrupted due to faulty disks, disk drives, or power failures. 3. Data in computer may get lost due to mistakenly or accidentally deleting or overwriting files. 4. Attacked by malicious viruses, data appear to get lost or corrupted completely. 5. Threats from unauthorized users may lead data loss or unnecessary change. 6. Of course, there are unavoidable factors which may pose risk to data safety like natural disasters, acts of terrorism, and war. 7. For profits or other purposes, some people may delete or change data maliciously. Judging from the factors listed above, we can see there is every chance that users come across data loss situations in daily life and work. Well then, how to guarantee data security to avoid confidential and significant data loss? We will recommend multiple measures for users as follows: 1. Users are supposed to develop a good habit of making backup for vital online casino canada data regularly, and the backups should be stored in safe locations. 2. Install powerful anti-virus software to computer and launch them regularly to prevent virus attack. 3. Set passwords for your confidential data to make the access to data restricted. 4. Place the disks with significant data stored in to a safe location, being fireproof and waterproof. 5. Only authorized users can be allowed to log computer areas by utilizing ID cards or magnetic swipe cards. 6. Maintain terminals off or locked if they are not needed. 7. By making use of write-protecting disk to shun accidental deletion issues. Furthermore, we will give an example which takes advantage of data security below: Online banking Numerous users must have banked online, so they may have noticed that the http in the address bar has changed to https after logging in. Actually, it is a symbol of secure connection establishment between users" computer and the bank"s computer. During the course of dealing, the data sent between the two will be encrypted to avoid malicious damage, and the detailed operation is that, if malicious users who want to intercept other people" computer, they will receive meaningless data, and the delivered data can only be decoded by utilizing a fix key which is known only to the two computers - yours and the bank"s.