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Those who will receive the individualized letters include current and former TUSD employees, students, parents and their dependents, he told the district鈥檚 Governing Board Tuesday night.

鈥淎t present, we don鈥檛 have any evidence ... that information was misused in any way,鈥� Trujillo emphasized.

He said that is the finding of a months-long forensic investigation by cyber experts 鈥� now being closed out by TUSD 鈥� after an exhaustive case-by-case review of 鈥渁round a million documents鈥� and files.

Trujillo did not say how the district is defining 鈥渕isuse鈥� in stating that none has been found, and there was no mention at the board meeting of findings reported in April by Bloomberg 蜜柚直播 that the cybercriminals put stolen confidential data about TUSD employees and students on the dark web for public access.

The letters will explain next steps that potential victims may take to protect against misuse of their data by the hackers, and will inform them of yearlong credit monitoring and identity-theft prevention services TUSD is providing at no charge to the 29,000 people, Trujillo said.

Officials of TUSD, Pima County鈥檚 largest district with more than 40,000 students at 87 schools, also told the board Tuesday night that they鈥檝e made major progress since the attack in working to reduce the possibility such a breach can occur again.

Among many other steps taken so far, they said, have been moving 75% or more of sensitive district data to 鈥渢he cloud鈥� for security; conducting 24-hour monitoring of TUSD systems; testing system security periodically by having a third party hack in; changing passwords and strengthening password rules; blocking public wi-fi access at district sites and instead using 鈥渉ot spots鈥�; and collaborating with 蜜柚直播 homeland security officials.

Trujillo previously confirmed that a ransomware group called Royal, active internationally, was responsible for what he called the 鈥渃yber terrorism鈥� event.

鈥淏loomberg 蜜柚直播 found that cybercriminals made off with gigabytes of files, containing tens of thousands of current and former employees鈥� Social Security numbers and other confidential records,鈥� reporter Jack Gillum, then with Bloomberg, reported in April. 鈥淭hey then uploaded the information in February to the dark web for anyone to access with an easily downloadable browser,鈥� he wrote.

鈥淓xamples of the leaked files include a high schooler鈥檚 medical records; another detailed arguments for expelling several students,鈥� Bloomberg鈥檚 article said.

Bloomberg found more than 16,000 numbers and birth dates tied to current and former employees on the dark web.

鈥淎nother leaked document included 鈥榗onfidential records鈥� concerning a high school student鈥檚 diabetes diagnosis and instructions for their insulin injections,鈥� the Bloomberg report said.