exfiltration

This term carries a clinical, tactical tone, originating from military and intelligence operations. It describes a precise, often clandestine movement out of a restricted or dangerous zone. While infiltration focuses on the entry, exfiltration emphasizes the successful exit, often under the cover of secrecy to avoid detection by an adversary.

In the digital realm, the word has shifted from physical movement to the movement of information. It specifically denotes the illicit removal of data, distinguishing it from a general data breach. While a breach is the act of breaking in, exfiltration is the act of carrying the prize out, implying a deliberate and structured theft of intellectual property or secrets.