black hat; malicious hacker
Refers to a hacker who violates computer security for malicious reasons or personal gain, as opposed to a white hat (ethical hacker).
A black hat broke into the company's system.
Standard katakana spelling for the loanword.
Variant with interpunct; less common in running text.
From English 'black hat', a term from old Western films where villains often wore black hats, adopted in cybersecurity to mean a malicious hacker.