CWE-325 (缺少必要的密码学步骤) — Vulnerability Class 35

CWE-325 represents a critical implementation flaw where software fails to execute a mandatory step within a cryptographic algorithm, thereby undermining the security guarantees promised by the underlying protocol. This weakness typically manifests when developers omit essential operations such as proper padding, key derivation, or initialization vector handling, resulting in ciphertext that is significantly easier to break than intended. Attackers exploit this gap by leveraging the reduced entropy or structural predictability to perform statistical analysis, brute-force attacks, or known-plaintext attacks that would otherwise be computationally infeasible against a correctly implemented cipher. To prevent this vulnerability, developers must rigorously adhere to standardized cryptographic libraries and specifications, ensuring every algorithmic step is explicitly coded and verified. Comprehensive code reviews and automated static analysis tools can further detect missing steps, ensuring that the final implementation matches the theoretical security model of the chosen cryptographic primitive.