{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:WJCXZSES6HMX7VSTDSOIG2KQGU","short_pith_number":"pith:WJCXZSES","canonical_record":{"source":{"id":"2505.20924","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-27T09:13:40Z","cross_cats_sorted":["cs.HC"],"title_canon_sha256":"950eab810f5c6555efe8173691c40d319a10956114716c5143c089243e5ce279","abstract_canon_sha256":"2e4699d7fca0df054f40ece950dca67454b1b9fb8b12c506108fb43248004816"},"schema_version":"1.0"},"canonical_sha256":"b2457cc892f1d97fd6531c9c8369503539b3b5c8f5ae6c0b1a9c6b91aa46e76f","source":{"kind":"arxiv","id":"2505.20924","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.20924","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"arxiv_version","alias_value":"2505.20924v2","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.20924","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_12","alias_value":"WJCXZSES6HMX","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_16","alias_value":"WJCXZSES6HMX7VST","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_8","alias_value":"WJCXZSES","created_at":"2026-07-05T11:49:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:WJCXZSES6HMX7VSTDSOIG2KQGU","target":"record","payload":{"canonical_record":{"source":{"id":"2505.20924","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-27T09:13:40Z","cross_cats_sorted":["cs.HC"],"title_canon_sha256":"950eab810f5c6555efe8173691c40d319a10956114716c5143c089243e5ce279","abstract_canon_sha256":"2e4699d7fca0df054f40ece950dca67454b1b9fb8b12c506108fb43248004816"},"schema_version":"1.0"},"canonical_sha256":"b2457cc892f1d97fd6531c9c8369503539b3b5c8f5ae6c0b1a9c6b91aa46e76f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:49:55.025057Z","signature_b64":"xOXEhQT2Y23bu3qL1pRHcisHVHevsADu3JUdi1tAIDi8rI+DDPltLaBRyLFEriymsITfqJKKqBoupuI2wQotDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b2457cc892f1d97fd6531c9c8369503539b3b5c8f5ae6c0b1a9c6b91aa46e76f","last_reissued_at":"2026-07-05T11:49:55.024590Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:49:55.024590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.20924","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:49:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dB3jZW6HQq8PgfddWNVUew+sz812n7nu9/gfArpbedF1N+Q+OqRLhTgVcAW4+C4hJr0nPs/AaMEmdoRtyjwrCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T11:24:26.422873Z"},"content_sha256":"bd1d3575e97569827dfc9960fc3390b847c34bcf0fbfcbd23ab6823b4bbaf3ef","schema_version":"1.0","event_id":"sha256:bd1d3575e97569827dfc9960fc3390b847c34bcf0fbfcbd23ab6823b4bbaf3ef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:WJCXZSES6HMX7VSTDSOIG2KQGU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Label Leakage in Federated Inertial-based Human Activity Recognition","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.HC"],"primary_cat":"cs.LG","authors_text":"Kristof Van Laerhoven, Marius Bock, Maximilian Hopp, Michael Moeller","submitted_at":"2025-05-27T09:13:40Z","abstract_excerpt":"While prior work has shown that Federated Learning updates can leak sensitive information, label reconstruction attacks, which aim to recover input labels from shared gradients, have not yet been examined in the context of Human Activity Recognition (HAR). Given the sensitive nature of activity labels, this study evaluates the effectiveness of state-of-the-art gradient-based label leakage attacks on HAR benchmark datasets. Our findings show that the number of activity classes, sampling strategy, and class imbalance are critical factors influencing the extent of label leakage, with reconstructi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.20924","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.20924/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:49:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"btaj/ifViMuoiqCUOa7efe2FOnjRjt/coPEU8VdZ7wYmBjwF/dqtvFBUHqOD+md989icdR5Xb2PLVo4r0FScDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T11:24:26.423466Z"},"content_sha256":"6b66acc41648f7cd333edb83532ea59496de6d1ef7196c845c4bea596afc2627","schema_version":"1.0","event_id":"sha256:6b66acc41648f7cd333edb83532ea59496de6d1ef7196c845c4bea596afc2627"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/bundle.json","state_url":"https://pith.science/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-08T11:24:26Z","links":{"resolver":"https://pith.science/pith/WJCXZSES6HMX7VSTDSOIG2KQGU","bundle":"https://pith.science/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/bundle.json","state":"https://pith.science/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WJCXZSES6HMX7VSTDSOIG2KQGU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:WJCXZSES6HMX7VSTDSOIG2KQGU","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2e4699d7fca0df054f40ece950dca67454b1b9fb8b12c506108fb43248004816","cross_cats_sorted":["cs.HC"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-27T09:13:40Z","title_canon_sha256":"950eab810f5c6555efe8173691c40d319a10956114716c5143c089243e5ce279"},"schema_version":"1.0","source":{"id":"2505.20924","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.20924","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"arxiv_version","alias_value":"2505.20924v2","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.20924","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_12","alias_value":"WJCXZSES6HMX","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_16","alias_value":"WJCXZSES6HMX7VST","created_at":"2026-07-05T11:49:55Z"},{"alias_kind":"pith_short_8","alias_value":"WJCXZSES","created_at":"2026-07-05T11:49:55Z"}],"graph_snapshots":[{"event_id":"sha256:6b66acc41648f7cd333edb83532ea59496de6d1ef7196c845c4bea596afc2627","target":"graph","created_at":"2026-07-05T11:49:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2505.20924/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"While prior work has shown that Federated Learning updates can leak sensitive information, label reconstruction attacks, which aim to recover input labels from shared gradients, have not yet been examined in the context of Human Activity Recognition (HAR). Given the sensitive nature of activity labels, this study evaluates the effectiveness of state-of-the-art gradient-based label leakage attacks on HAR benchmark datasets. Our findings show that the number of activity classes, sampling strategy, and class imbalance are critical factors influencing the extent of label leakage, with reconstructi","authors_text":"Kristof Van Laerhoven, Marius Bock, Maximilian Hopp, Michael Moeller","cross_cats":["cs.HC"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-27T09:13:40Z","title":"Label Leakage in Federated Inertial-based Human Activity Recognition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.20924","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:bd1d3575e97569827dfc9960fc3390b847c34bcf0fbfcbd23ab6823b4bbaf3ef","target":"record","created_at":"2026-07-05T11:49:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2e4699d7fca0df054f40ece950dca67454b1b9fb8b12c506108fb43248004816","cross_cats_sorted":["cs.HC"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-27T09:13:40Z","title_canon_sha256":"950eab810f5c6555efe8173691c40d319a10956114716c5143c089243e5ce279"},"schema_version":"1.0","source":{"id":"2505.20924","kind":"arxiv","version":2}},"canonical_sha256":"b2457cc892f1d97fd6531c9c8369503539b3b5c8f5ae6c0b1a9c6b91aa46e76f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b2457cc892f1d97fd6531c9c8369503539b3b5c8f5ae6c0b1a9c6b91aa46e76f","first_computed_at":"2026-07-05T11:49:55.024590Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:49:55.024590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xOXEhQT2Y23bu3qL1pRHcisHVHevsADu3JUdi1tAIDi8rI+DDPltLaBRyLFEriymsITfqJKKqBoupuI2wQotDg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:49:55.025057Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.20924","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bd1d3575e97569827dfc9960fc3390b847c34bcf0fbfcbd23ab6823b4bbaf3ef","sha256:6b66acc41648f7cd333edb83532ea59496de6d1ef7196c845c4bea596afc2627"],"state_sha256":"1c916e7fa43377d5e5538bed024081091538a85a0d01e1712dd39d9e2e4c24c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e/UB74h+zuboQcydBU1kQA6PVTo+xlhQv6JkKeVUwFXWyPIBs0t5Nuen2u7eaDQyYRyFdHYeN8Tk+3YO6Nj7Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T11:24:26.427602Z","bundle_sha256":"dcc1f080b9923992f39705fade823e4908f37206c7a41383d7874a16e7ddba10"}}