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Yahoo Japan suspects vast ID theft
Yahoo Japan Corp. suspects that up to 22 million user IDs may have been stolen during an unauthorized attempt to access the administrative system of its Yahoo! Japan portal.
“We don’t know if the file (of 22 million user IDs) was leaked or not, but we can't deny the possibility, given the volume of traffic between our server and external” terminals, the company said in a statement late Friday.
The information did not include passwords and the kind of data necessary to verify a user's identity or reset passwords, it said, adding that the company had updated its security measures to prevent a repeat of the incident.