Anthropic API Key detection
A publicly auditable detection pattern in the LeakSnitch engine. Category: API Keys, Tokens and Secrets. Severity: Critical.
Short answer
LeakSnitch detects anthropic api key with a base score of 95 (Critical severity). The pattern below is fully public, so any security team can verify exactly what gets flagged before rollout.
(sk-ant-[a-zA-Z0-9\-_]{20,})Base score
95 / 100
Severity
Critical
Category
API Keys, Tokens and Secrets
Why it matters
Claude API keys starting with sk-ant are flagged before they can reach any third party AI platform.
In the LeakSnitch engine this pattern is one of 58 public rules combined with context signals, entropy analysis, and checksum validators. A single match never blocks by itself; the full context aware scoring decides whether anthropic api key in a prompt is a real leak or a false positive.
Frequently asked questions
Why is the anthropic api key pattern public?
LeakSnitch's competitive advantage is the context aware engine, not hidden regexes. Publishing every pattern lets security teams audit, test, and trust the detection before it ships to their organization.
Can I test this anthropic api key pattern?
Yes. Paste sample text into the free LeakSnitch scanner in your browser and watch the exact detection in action, including severity and scoring.
Does LeakSnitch use other signals for anthropic api key?
This public pattern is the format based layer. The engine adds context signals, disclosure phrasing, entropy fallback, and checksum validation to confirm high confidence before blocking.
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