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Hackers first gained access to Home Depot's systems through stolen vendor login credentials. Although this data includes a comprehensive list of data breaches, whether large-scale or small, there are a few that stand out from the rest as some of the worst data breaches in history in terms of resulting costs and the number of records compromised. TJX - A hacker managed to infiltrate TJX chains, including Marshalls and TJ Maxx, and stole This breach is still considered one of the biggest retail data breaches of all time. In some instances, login credentials were obtained through tricking users and then used to access customer information. Hannaford Brothers - Hackers managed to steal 4. The attack was said to impact two-thirds of all American households, making this breach one of the largest in history. This breach was particularly devastating because it included the theft of millions of medical records thought to be worth 10 times the amount of credit card data. The card-skimming malware compromised the identities of 70 million customers and 40 million credit and debit cards. In this particular breach, user payment information via PayPal was safe since it was encrypted; users were only asked to change their passwords as a precautionary measure. The attack began with phishing emails sent to five employees who were tricked into downloading a Trojan with keylogger software that enabled the attackers to obtain passwords for accessing the unencrypted data. Anthem - In February of , hackers broke into Anthem's servers and stole up to 80 million records.

According to their data, there were breaches inthe largest number of data breaches in a single year to date. This shows an upward trend in the number of data breaches resulting from an outside cyber-attack. Like many of the other breaches included in this post, hackers gained access to Ebay accounts through stolen login is paypal safer than debit card.

The malware could intercept customer data during transactions, which was then used in over 2, cases of international customer fraud. Hackers collected customer data via malware uploaded to Hannaford servers. To find out how to prevent large-scale data breaches, you can visit our Preventing Data Breaches page.

Once the credentials were compromised, they installed malware on Home Depot's payment systems that allowed them to collect consumer credit and debit card data. Target - In order to gain access to customer credit and debit card numbers, hackers installed malicious software on POS systems in Target stores in self-checkout lanes. The same malware was later found in the Home Depot breach referenced below. Home Depot - A security breach that attacked Home Depot's payment terminals affected 56 million credit and debit card numbers. JP Morgan Chase - In , a cyber-attack aimed at JP Morgan Chase compromised 83 million household and business accounts that included personal information such as names, email addresses, and phone numbers. Sony Pictures - Analysts believe that the Sony breach began with a series of phishing attacks targeted at Sony employees. The healthcare giant is the parent company of several well-known healthcare providers including Blue Cross and Blue Shield. The credentials did not come from customers themselves but instead from Ebay employees. Hackers also exploited the Heartbleed bug in this breach, a vulnerability in OpenSSL that allowed hackers to steal information that is normally encrypted. Below is a list of 8 of the worst breaches in history that highlights the cause of the breach and the effects on the public and business sectors. It is suspected that the stolen health records will be sold on the black market in the future. A little less than a year later, four men were indicted for the attack on JP Morgan Chase as well as several other financial institutions with charges including securities and wire fraud, money laundering, and identity theft. Hackers then used Sony employee login credentials to breach Sony's network. This type of attack used social engineering, where phishing emails appeared to be from someone the employees knew, thus tricking them into trusting its source. These phishing attacks worked by convincing employees to download malicious email attachments or visit websites that would introduce malware to their systems. Ebay - Between February and March of , Ebay requested that million users change their account passwords due to a breach that compromised encrypted passwords along with other personal information.