Weak encryption algorithm (RC4) detected.

• Rule ID: ruby_lang_weak_encryption_rc4
• Languages: ruby
• Source: weak_encryption_rc4.yml

Description

A weak encryption library can lead to data breaches and greater security risk.

Remediations

According to OWASP, RC4 (Rivest Cipher 4) is considered a weak encryption algorithm and therefore shouldn't be used.

❌ Avoid libraries and algorithms with known weaknesses:

RC4.new("weak password encryption")

✅ Instead, we recommend using bcrypt:

BCrypt::Password.create('iLOVEdogs123')

Resources

• BCrypt Explained

Associated CWE

• CWE-331: Insufficient Entropy
• CWE-326: Inadequate Encryption Strength

OWASP Top 10

• A02:2021 - Cryptographic Failures

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=ruby_lang_weak_encryption_rc4

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=ruby_lang_weak_encryption_rc4