AES-GCM Outperforms CBC for Modern Web App Security

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AES-CBC mode remains common in legacy web systems despite known vulnerabilities. Its lack of built-in authentication enables padding oracle and bit-flipping attacks. Modern standards like TLS 1.3 have phased out CBC in favor of AES-GCM. AES-GCM provides authenticated encryption that prevents these active network threats. Implementation guidance now focuses on secure Web Crypto API usage.

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