For Yahoo users who may be worried about their personal data getting into the hands of cyber criminals, James Lyne, global head of security research at Sophos , offers the following advice:

Change your Yahoo password immediately.

1. Reset this password, if you're reusing it on other online sites. Cybercriminals are now using tools that sniff out passwords reused on other, more valuable sites to make their work easier and to make the stolen passwords and other hacked data more lucrative on the dark web.

2. Make all new passwords different and difficult to guess – yes, you need to create different passwords for every site you visit.

3. Include upper and lower case letters, numbers and symbols to make passwords harder to crack - refer to the Sophos Password Quick Tips guide for creating stronger passwords.

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