Jisho

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Noun
1. identity fraud; masquerading (as somebody else)Usually written using kana alone
  • ひと
  • パスワード
  • らんよう乱用
  • する
  • なりすまし
  • こうい行為
  • もんだい問題
  • になっている
Now that people can steal passwords, illegal impersonation is becoming a serious problem.
Noun
2. spoofing; forgery (e.g. of email)Computing, Usually written using kana alone
Other forms
成り済まし 【なりすまし】

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