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Identity theft and account takeover: attacks and protective measures

Account Takeover attacks: credential stuffing, password spraying, SIM swapping, MFA bypass. Protections via Conditional Access and FIDO2.

Summary: Account takeover (ATO) refers to the unauthorized takeover of user accounts by attackers. Attack vectors: credential stuffing (leaked passwords), brute force, phishing/MFA bypass, session hijacking, password reset vulnerabilities, and SIM swapping. ATO is the starting point for fraud, data breaches, and privilege escalation. Detection: impossible travel, device fingerprinting anomalies, velocity checks.

Sources & References

  1. [1] NIST Special Publication 800-63B Digital Identity Guidelines - NIST
  2. [2] ENISA Threat Landscape: Identity Theft - ENISA

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About the Author

Jan Hörnemann
Jan Hörnemann

COO

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M.Sc. in Internet Security (if(is), Westfälische Hochschule). COO and authorized officer (Prokurist) with expertise in information security consulting and security awareness. Junior professor (Nachwuchsprofessur) for Cyber Security at FOM Hochschule, CISO lecturer at isits AG and doctoral candidate at the Graduierteninstitut NRW.

11 Publikationen
ISO 27001 Lead Auditor (PECB/TÜV) T.I.S.P. (TeleTrusT) ITIL 4 (PeopleCert) BSI IT-Grundschutz-Praktiker (DGI) Ext. ISB (TÜV) BSI CyberRisikoCheck CEH (EC-Council)
This article was last edited on 03/29/2026. Responsible: Jan Hörnemann, COO at AWARE7 GmbH. License: CC BY 4.0 - free use with attribution: "AWARE7 GmbH, https://a7.de"

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