A security researcher at Adversa has identified a method to bypass Grok’s safety mechanisms by encrypting harmful instructions alongside decryption keys and plaintext decryption guidance. When users instruct the assistant to summarize a webpage containing this encrypted content, Grok decrypts and executes the hidden commands without triggering safety alerts or requiring user confirmation.
The attack works by disguising malicious instructions within ciphertext that appears innocuous to content filters. The encrypted payload instructs Grok to construct what is presented as a decryption key but actually contains sensitive user information including name, location, and chat history. This fabricated key is then appended to a URL parameter directing to the attacker’s server, where the stolen data is logged upon access.
Researchers theorize that Grok’s filtering guardrails inspect text entering and leaving the model but fail to monitor outputs from the model’s own code execution. Requests to process ciphertext using standard encryption methods like PBKDF2 and AES-256-GCM pass through filters as ordinary operations, since classifiers cannot determine what the encrypted content contains. Once decrypted internally, the revealed instructions reach the model as its own tool output, bypassing guardrail inspection entirely.
Adversa employed similar encryption-based techniques in separate attacks against Google’s Gemini, though the company did not formally report jailbreak attempts since they fall outside Google’s vulnerability disclosure scope. The security firm notes that such attacks represent a broader category of vulnerabilities targeting an LLM’s wider operational context, including tool outputs and intermediate processing states, rather than just direct user prompts. The technique demonstrates an ongoing asymmetry between LLM defenders, who construct individual guardrails, and attackers, who continuously discover new vectors to circumvent them.
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