Explore instance-hiding schemes for private distributed learning in this comprehensive seminar on theoretical machine learning. Delve into cryptographic techniques, data augmentation methods, and privacy-preserving algorithms as presented by Sanjeev Arora, a Distinguishing Visiting Professor from Princeton University. Examine topics such as Instahide, mixup data augmentation, multiplicative noise, and sine flip, while gaining insights into parameter mixing and experimental results. Analyze the implications of privacy laws, statistical indistinguishability, and practical attacks on privacy-preserving methods. Understand why mixup alone is not secure and discover the latest advancements in balancing machine learning efficiency with data privacy in distributed settings.