Hackers have stolen information from thousands of Citibank customers in the U.S., the bank confirmed.
The violation exposed customer names, account numbers and other contact information.But key data such as date of birth and security codes map not have been compromised, the bank said in a statement.
Citigroup is the latest in a series of companies to target high-level cyber-criminals.
Citigroup has been criticized for failing to tell customers about the breach when it occurred in May.
"We are in contact with customers whose information was involved. Citi has implemented improved procedures to prevent recurrence of such events," said a spokesman for Citi in a statement to Reuters news agency.
alert about 200,000 customers affected by the declaration said, although the bank had previously said it could affect up to 1% of its 21 million users.It not detail how the breach was occurred.Security experts said that the thieves may groped for to acquire more information on these subjects.
"Even if customers are likely to have Citi fraudulent charges against their accounts as a result of the breach is likely to face social engineering to try to give further offense," blogged Chester Wisniewski, a consultant at security firm Sophos.
"Customers affected by this incident should be alert to fraud, phishing and telephone calls to be from Citibank and their subsidiaries," he added.
Citigroup is the atest in a series of companies compromised in recent weeks. Japanese electronics group Sony is still recovering from the theft of millions of pieces of information on its network.
Although the security company RSA has offered to replace the 40 million chips used by people to connect securely to the banks after it emerged that the main data that runs between them were stolen in March.
The violation exposed customer names, account numbers and other contact information.But key data such as date of birth and security codes map not have been compromised, the bank said in a statement.
Citigroup is the latest in a series of companies to target high-level cyber-criminals.
Citigroup has been criticized for failing to tell customers about the breach when it occurred in May.
"We are in contact with customers whose information was involved. Citi has implemented improved procedures to prevent recurrence of such events," said a spokesman for Citi in a statement to Reuters news agency.
alert about 200,000 customers affected by the declaration said, although the bank had previously said it could affect up to 1% of its 21 million users.It not detail how the breach was occurred.Security experts said that the thieves may groped for to acquire more information on these subjects.
"Even if customers are likely to have Citi fraudulent charges against their accounts as a result of the breach is likely to face social engineering to try to give further offense," blogged Chester Wisniewski, a consultant at security firm Sophos.
"Customers affected by this incident should be alert to fraud, phishing and telephone calls to be from Citibank and their subsidiaries," he added.
Citigroup is the atest in a series of companies compromised in recent weeks. Japanese electronics group Sony is still recovering from the theft of millions of pieces of information on its network.
Although the security company RSA has offered to replace the 40 million chips used by people to connect securely to the banks after it emerged that the main data that runs between them were stolen in March.
