Cyber experts have warned that hacks, such as the one on the telecoms firm TalkTalk, are inevitable and as a result businesses must work harder at protecting the data they have.
Michala Hart, the head of channel strategy at cloud computing firm Exponential-e, says no individual or business is ever completely safe online."Once again, this latest attack shows that it's not a matter of if you'll be hacked but when", she says.
But while online security breaches might be all too common, you can take some steps to protect their accounts.
Here are 10 things people can do to protect their online identity:
Keep passwords safe
Experts say that your password should be treated with the same care as your front door keys: you wouldn't give your keys to a stranger and you wouldn't leave your front door wide open. Sticking a password on your monitor is tantamount to doing just that.
If you have to write passwords down to remember them, encrypt them in a way familiar to only you or write down a clue to remind you.
Create strong, unique passwords
The advice is always to use complex, unique passwords but a survey by Telesign of 2,000 people in the US and UK showed that two thirds of people use the same password for all accounts. This means that if hackers break one account, they will have access to everything.
Nearly half of those surveyed hadn't changed their passwords for over five years. Experts advise never to reuse old passwords or recycle them (password1, password2 etc.)
Cyber experts advise to create unique, long passwords of eight characters or more using upper and lower case letters, numbers and symbols and change them regularly.
People should avoid using easily identifiable information, such as names and birthdays. The more complex the password the better, so made-up phrases using punctuation and numbers for letters could help you remember them - such as '!d0g5lykD3n7i5t5!' for 'Dogs like Dentists'.
An easy way for hackers is to harvest usernames and passwords using fake webpages designed to look like ones you use, such as your bank or Facebook.
When you click a link you should always check the URL is the one you would expect before you enter any personal details. A secure way to open sites is using https:// at the beginning of the web address, which encrypts your data. If a green padlock is next to the address, the website is secure.
Protect your devices and wipe your data
Devices hold all the personal information that would be useful for hackers so people should physically protect their devices with passcodes and keep them safely locked away.
And when upgrading to a new mobile phone, personal data should be wiped before it is thrown away or recycled.
Beware of phishing websites and downloading malicious software
Clicking on unknown links may lead to 'phishing' sites (that harvest usernames and passwords) or download viruses or malware (malicious software) onto devices that make them vulnerable to hacking.
Downloading attachments provides an open door for hackers so people should consider whether attachments can be trusted, even if they are sent from a friend - their email account could be compromised.
Use antivirus software and firewalls
Protection software and firewalls are essential as thousands of new viruses are detected every year. Most antivirus software automatically downloads updates on existing viruses and updates on new threats.
Choose a reputable programme to scan emails, monitor files, scan your computer and protect you from dangerous downloads.
Beware of public WiFi
Hackers can use unsecured public wifi zones to target people using mobile devices. They can also set up a fake network to harvest information.
When in a public place, ask an employee for the username and password of their wifi and wherever possible use well-known providers such as BT OpenZone or T-Mobile.
Once you have finished browsing on a WiFi, log off all services you were using and then ask the device to forget the network so it doesn’t automatically join next time you’re in range.
To be extra secure, it is not recommended to send or receive private information using public WiFi.
Beware of dodgy 'free' apps
Apps can be another method for hackers to download spyware onto devices. Always check the permissions on the apps before installing them to make sure they are not storing unnecessary personal information. For example, a game app should not have access to your contacts list or your network info.
Access Trojans (ATs) are usually downloaded invisibly within a programme and perform actions similar to legitimate software. Regularly update apps as they tend to patch security problems.
The easiest way to steal someone's identity is to dupe that person into freely handing the information over. Just because somebody calls or emails and appears to have some information about you doesn't mean they can be trusted.
No bank or business should ever ask for a pin or password and passwords should not be sent by email, ever. Monitor your bank and report any suspicious activity immediately.
Equally, when using tablets and laptops in public areas, be aware of people around you and avoid sharing personal details on the telephone in public places.
Take security seriously
Many banks and other businesses are using 'two-factor authentication' to phase out single passwords altogether so consider favouring those that take your data as seriously as you do.
As Professor Peter Sommer, visiting lecturer at de Montfort University in information system security, says: "Check the web news archives to see whether a company has been hacked in the past - and how it responded. TalkTalk has an unfortunately long history of recent problems."