identity fraud; masquerading; impersonation
General term for pretending to be someone else, often for fraudulent purposes. Used in contexts like online impersonation, fake accounts, or social engineering.
Impersonation damage is increasing on social media.
He impersonated someone else and swindled money.
He impersonated a celebrity and posted on social media.
Please be careful of spoofed emails claiming to be from your company.
The bank quickly detected the identity fraud.
Many people have fallen victim to identity fraud.
偽装 means disguising or camouflaging the appearance of things or facts, while 成りすまし is specifically about assuming another person's identity.
詐称 refers to falsely claiming a specific name, title, or qualification, whereas 成りすまし covers the broader act of passing oneself off as someone else, including online impersonation.
Used when referring to incidents or cases of impersonation/fraud, but this noun is not normally counted as a physical object.
Kanji-kana mixed form; less common than pure kana.
Full kanji form; rare in practice.
Noun form of the verb なりすます (成り済ます), meaning 'to impersonate' or 'to pose as'. The verb is a compound of なる (to become) and すます (to finish or to pass oneself off as).