{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:C3ZCQYQHQNHFYEGLMCN4ZEZLAU","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":"37066907fb701a3e4d641ee2ab09dcca7485181e4e880e637c276f708e1d55ca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-09-01T04:14:21Z","title_canon_sha256":"dc73440d9ea6d8f20269a33daa0169b8bf8fccae8d774f9fee2f7d1205ddd9dc"},"schema_version":"1.0","source":{"id":"1809.00111","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.00111","created_at":"2026-05-18T00:02:24Z"},{"alias_kind":"arxiv_version","alias_value":"1809.00111v2","created_at":"2026-05-18T00:02:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.00111","created_at":"2026-05-18T00:02:24Z"},{"alias_kind":"pith_short_12","alias_value":"C3ZCQYQHQNHF","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"C3ZCQYQHQNHFYEGL","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"C3ZCQYQH","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:57575edf2f406e87c7d6c95bbc2f5e3b8ff139326fdb403b74e83ff99acb015e","target":"graph","created_at":"2026-05-18T00:02:24Z","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"},"paper":{"abstract_excerpt":"This paper introduces a new attack on recent messaging systems that protect communication metadata. The main observation is that if an adversary manages to compromise a user's friend, it can use this compromised friend to learn information about the user's other ongoing conversations. Specifically, the adversary learns whether a user is sending other messages or not, which opens the door to existing intersection and disclosure attacks. To formalize this compromised friend attack, we present an abstract scenario called the exclusive call center problem that captures the attack's root cause, and","authors_text":"David Lazar, Ioanna Tzialla, Sebastian Angel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-09-01T04:14:21Z","title":"What's a little leakage between friends?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.00111","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":"sha256:90a1d385ac6fb76169936fa7687d0ac954bbee6ace996f9eca2a0486f6d5d616","target":"record","created_at":"2026-05-18T00:02:24Z","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":"37066907fb701a3e4d641ee2ab09dcca7485181e4e880e637c276f708e1d55ca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-09-01T04:14:21Z","title_canon_sha256":"dc73440d9ea6d8f20269a33daa0169b8bf8fccae8d774f9fee2f7d1205ddd9dc"},"schema_version":"1.0","source":{"id":"1809.00111","kind":"arxiv","version":2}},"canonical_sha256":"16f2286207834e5c10cb609bcc932b053703cea689ee7d2fa4d01d79a6645bc1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"16f2286207834e5c10cb609bcc932b053703cea689ee7d2fa4d01d79a6645bc1","first_computed_at":"2026-05-18T00:02:24.720872Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:24.720872Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PH53IuiXN7A2/y4XMC7cJ1TkvwYr6u6g5CljwZmlH36lF41FpaUiVTIYl7v/58LSVwplGe912mrCs2aaaSuLBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:24.721483Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.00111","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:90a1d385ac6fb76169936fa7687d0ac954bbee6ace996f9eca2a0486f6d5d616","sha256:57575edf2f406e87c7d6c95bbc2f5e3b8ff139326fdb403b74e83ff99acb015e"],"state_sha256":"9080a1bc6d950a571e13ddb0ec056b453f025f0a9abb628abaf0563620c04306"}