Will It Vibe?RC4 stream cipher
Part of Security, which counts for 30% of the overall score. When this check fires it deducts 15 points from that category, once per scan, no matter how many places it turns up.
What it detects
RC4 has practical keystream biases and is prohibited by modern standards.
Why it matters
RC4 has well-documented keystream biases that leak plaintext, which is why TLS and every major standard prohibit it. Ciphertext produced with RC4 can be partially recovered without the key. It should not appear in new code.
How to fix it
Replace RC4 with AES-256-GCM or ChaCha20-Poly1305, both authenticated stream/AEAD ciphers with no known practical weaknesses. Use a unique nonce per message and store it with the ciphertext. Re-encrypt any data currently protected by RC4.
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