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How do attackers smuggle prompt injections past filters using encoding and obfuscation?

base64, leetspeak, invisible Unicode, and foreign scripts all let a payload read as gibberish to your filter but as a clear instruction to the model. The signal is knowing why the model decodes what the classifier cannot.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

base64, leetspeak, invisible Unicode, and foreign scripts all let a payload read as gibberish to your filter but as a clear instruction to the model. The signal is knowing why the model decodes what the classifier cannot.

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