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Why LLM-Generated Passwords Are Dangerously Insecure


LLM-generated passwords appear strong, but are fundamentally insecure. Testing across GPT, Claude, and Gemini revealed highly predictable patterns: repeated passwords across runs, skewed character distributions, and dramatically lower entropy than expected. Coding agents compound the problem by sometimes preferring and using LLM-generated passwords without the user’s knowledge. We recommend avoiding LLM-generated passwords and directing both models and coding agents to use secure password generation methods instead.

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