Will It Vibe?Legacy weak symmetric cipher provider instantiated
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
DESCryptoServiceProvider, TripleDESCryptoServiceProvider, and RC2CryptoServiceProvider implement ciphers that are brute-forceable (DES, RC2) or retired (3DES) by modern standards and should not be used for new encryption.
Why it matters
DESCryptoServiceProvider (56-bit DES), TripleDESCryptoServiceProvider (retired 3DES), and RC2CryptoServiceProvider (weak, small-block RC2) are all cryptographically broken or obsolete by current standards. Data encrypted with any of them can be decrypted with realistic amounts of compute, so anything protected this way should be treated as effectively unencrypted against a motivated attacker.
How to fix it
Replace the legacy provider with Aes.Create() (AES-GCM via AesGcm on .NET Core 3.0+, or AES-CBC with an HMAC if you need broader compatibility). AES with a 256-bit key and an authenticated mode is the standard modern choice for symmetric encryption in .NET and requires re-encrypting any data that was protected with the old cipher.
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