ResNet-18 with Multi-Step Gradient Defense (MSGD) integrates adversarial robustness into a standard residual network by inserting gradient smoothing layers after each residual block. Input images flow through the initial 7×7 convolution, then through four residual blocks (64, 128, 256, 512 filters) with interleaved MSGD defense blocks that denoise gradient information at each stage. This architecture demonstrates how to augment classical CNN designs with adversarial training mechanisms without sacrificing feature extraction capability. Fork this diagram to customize defense parameters, adjust residual block depths, or integrate alternative robustness techniques into your own models. The MSGD approach represents a practical academic pattern for building neural networks resilient to gradient-based adversarial attacks while maintaining ImageNet-scale classification performance.