US Patent 11647046 Fuzzy inclusion based impersonation detection

Aspects of this disclosure include fuzzy inclusion based impersonation detection technology. In one embodiment, a reverse n-gram map is created for the list of protected entities. A suspicious string may be broken into n-grams, and each n-gram of the suspicious string is to be searched in the reverse n-gram map for corresponding protected entities. A fuzzy inclusion of a protected entity may be detected in the suspicious string depending on the protected entities found during the search. Subsequently, impersonation can be identified based on the characteristics of the fuzzy inclusion. In this way, the communication system can detect impersonation techniques using visually similar text, and accordingly take various actions to help user mitigate risks caused by impersonation.