Daniel Sentinelli

Early Life and Background

Daniel "El Chacal" Sentinelli was born in Buenos Aires, Argentina, in September 1965. He began his activities as a hacker during the 1980s, emerging during a period when the global hacking scene was still in its formative years.

Early Career and Community Involvement

Sentinelli was one of the founding members of Piratas Unidos Argentinos, established in 1986 — one of the early organized hacker collectives in Argentina. His involvement in this group placed him among the pioneers of the Argentine hacking community at a time when such activity was largely uncharted territory in the country.

He also participated in the First Hacking Congress in Argentina, where he delivered a presentation on data cryptography using PGP (Pretty Good Privacy). This appearance underscored his interest not only in network intrusion but also in privacy and encryption technologies.

FBI Encounter and Public Disclosure

During the 1990s, concerns within the United States government about the vulnerability of its classified networks led the FBI to dispatch an agent to their base in Montevideo. Sentinelli, operating under the handle "El Chacal," chose to reveal his identity and conducted a public demonstration at a cybercafe in the Belgrano neighborhood, showing how straightforward it was to gain unauthorized access to those systems.

This act made him one of the first Argentine hackers to openly disclose his identity — a significant step at a time when most hackers in the region, and globally, maintained strict anonymity. The demonstration drew attention to the real-world security gaps present in government infrastructure and helped establish Sentinelli as a notable figure in the Argentine and broader Latin American hacking communities.

Security Consulting Career

Following his public disclosure, Sentinelli transitioned into professional security work, becoming a security consultant. He has provided services to both private companies and government bodies, applying the technical knowledge he developed during his years as a hacker to legitimate defensive security roles.

He has also worked as a columnist for Dominio Digital, contributing to public discourse on digital security topics.

Recognition

Sentinelli's story has been documented in published works on the history of hacking in Argentina, including Llaneros Solitarios - Hackers, la Guerrilla Informática (1995) by Raquel Roberti and Fernando Bonsembiante, and El Libro Negro del Hacker (2019). These references position him as a historically significant figure in the development of hacker culture in Argentina.