{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:BMFU5Q5NTTHM3RZQW4HG7OAOZP","short_pith_number":"pith:BMFU5Q5N","canonical_record":{"source":{"id":"1406.1213","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2014-06-04T21:13:30Z","cross_cats_sorted":["cs.NI","cs.SD"],"title_canon_sha256":"d7a68b76cd1e19ee88f31842116499c766cd6f20203e3eba06e6ceefb1a861d0","abstract_canon_sha256":"5281aa00a13b01ca9fd2c4f6da0c8ba4cc3d0d4db365b1dbfc9c91c855c98c85"},"schema_version":"1.0"},"canonical_sha256":"0b0b4ec3ad9ccecdc730b70e6fb80ecbc8efb714fb877ecabdd98535c015a413","source":{"kind":"arxiv","id":"1406.1213","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.1213","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"arxiv_version","alias_value":"1406.1213v1","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.1213","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"pith_short_12","alias_value":"BMFU5Q5NTTHM","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BMFU5Q5NTTHM3RZQ","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BMFU5Q5N","created_at":"2026-05-18T12:28:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:BMFU5Q5NTTHM3RZQW4HG7OAOZP","target":"record","payload":{"canonical_record":{"source":{"id":"1406.1213","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2014-06-04T21:13:30Z","cross_cats_sorted":["cs.NI","cs.SD"],"title_canon_sha256":"d7a68b76cd1e19ee88f31842116499c766cd6f20203e3eba06e6ceefb1a861d0","abstract_canon_sha256":"5281aa00a13b01ca9fd2c4f6da0c8ba4cc3d0d4db365b1dbfc9c91c855c98c85"},"schema_version":"1.0"},"canonical_sha256":"0b0b4ec3ad9ccecdc730b70e6fb80ecbc8efb714fb877ecabdd98535c015a413","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:50:23.783264Z","signature_b64":"XuE8lZ7C3/RnmkmY0pFvqaEBz+PNFaVfEqBtQ+yVquNb9xV69esO5xNR9Ww2if3ymWRZ3pThEZhKwpY99eBMCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0b0b4ec3ad9ccecdc730b70e6fb80ecbc8efb714fb877ecabdd98535c015a413","last_reissued_at":"2026-05-18T02:50:23.782729Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:50:23.782729Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1406.1213","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:50:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ATVOS7DkMIaT6IbQOAn9qwz6zW3fNcQ0MT/30pm2U6tjufFNZ6vUncTIRuWZ1T27BcvctCPIeJsUnKyfkRW4Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:26:17.782427Z"},"content_sha256":"295b87026642ce0ade8bca4e01e6a89ce27fd4a55bed4f8837f6fd46e77ff7a3","schema_version":"1.0","event_id":"sha256:295b87026642ce0ade8bca4e01e6a89ce27fd4a55bed4f8837f6fd46e77ff7a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:BMFU5Q5NTTHM3RZQW4HG7OAOZP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On Covert Acoustical Mesh Networks in Air","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.NI","cs.SD"],"primary_cat":"cs.CR","authors_text":"Michael Goetz, Michael Hanspach","submitted_at":"2014-06-04T21:13:30Z","abstract_excerpt":"Covert channels can be used to circumvent system and network policies by establishing communications that have not been considered in the design of the computing system. We construct a covert channel between different computing systems that utilizes audio modulation/demodulation to exchange data between the computing systems over the air medium. The underlying network stack is based on a communication system that was originally designed for robust underwater communication. We adapt the communication system to implement covert and stealthy communications by utilizing the ultrasonic frequency ra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.1213","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T02:50:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6gFD2EvHdHPCqeq7l/tlf+TGiHK0hS+/+u70fRGantx6OO0jq4wzUChXoM+PgWLh9CxWw9tMsI7fiv3cSPwnDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:26:17.783068Z"},"content_sha256":"a453ad0fee3d06d0b5b4b6d639d47c22f208690f6d61b2251cf28596ee770bc3","schema_version":"1.0","event_id":"sha256:a453ad0fee3d06d0b5b4b6d639d47c22f208690f6d61b2251cf28596ee770bc3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/bundle.json","state_url":"https://pith.science/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/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":"2026-05-27T11:26:17Z","links":{"resolver":"https://pith.science/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP","bundle":"https://pith.science/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/bundle.json","state":"https://pith.science/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BMFU5Q5NTTHM3RZQW4HG7OAOZP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:BMFU5Q5NTTHM3RZQW4HG7OAOZP","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":"5281aa00a13b01ca9fd2c4f6da0c8ba4cc3d0d4db365b1dbfc9c91c855c98c85","cross_cats_sorted":["cs.NI","cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2014-06-04T21:13:30Z","title_canon_sha256":"d7a68b76cd1e19ee88f31842116499c766cd6f20203e3eba06e6ceefb1a861d0"},"schema_version":"1.0","source":{"id":"1406.1213","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.1213","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"arxiv_version","alias_value":"1406.1213v1","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.1213","created_at":"2026-05-18T02:50:23Z"},{"alias_kind":"pith_short_12","alias_value":"BMFU5Q5NTTHM","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BMFU5Q5NTTHM3RZQ","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BMFU5Q5N","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:a453ad0fee3d06d0b5b4b6d639d47c22f208690f6d61b2251cf28596ee770bc3","target":"graph","created_at":"2026-05-18T02:50:23Z","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":"Covert channels can be used to circumvent system and network policies by establishing communications that have not been considered in the design of the computing system. We construct a covert channel between different computing systems that utilizes audio modulation/demodulation to exchange data between the computing systems over the air medium. The underlying network stack is based on a communication system that was originally designed for robust underwater communication. We adapt the communication system to implement covert and stealthy communications by utilizing the ultrasonic frequency ra","authors_text":"Michael Goetz, Michael Hanspach","cross_cats":["cs.NI","cs.SD"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2014-06-04T21:13:30Z","title":"On Covert Acoustical Mesh Networks in Air"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.1213","kind":"arxiv","version":1},"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":"sha256:295b87026642ce0ade8bca4e01e6a89ce27fd4a55bed4f8837f6fd46e77ff7a3","target":"record","created_at":"2026-05-18T02:50:23Z","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":"5281aa00a13b01ca9fd2c4f6da0c8ba4cc3d0d4db365b1dbfc9c91c855c98c85","cross_cats_sorted":["cs.NI","cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2014-06-04T21:13:30Z","title_canon_sha256":"d7a68b76cd1e19ee88f31842116499c766cd6f20203e3eba06e6ceefb1a861d0"},"schema_version":"1.0","source":{"id":"1406.1213","kind":"arxiv","version":1}},"canonical_sha256":"0b0b4ec3ad9ccecdc730b70e6fb80ecbc8efb714fb877ecabdd98535c015a413","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b0b4ec3ad9ccecdc730b70e6fb80ecbc8efb714fb877ecabdd98535c015a413","first_computed_at":"2026-05-18T02:50:23.782729Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:50:23.782729Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XuE8lZ7C3/RnmkmY0pFvqaEBz+PNFaVfEqBtQ+yVquNb9xV69esO5xNR9Ww2if3ymWRZ3pThEZhKwpY99eBMCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:50:23.783264Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.1213","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:295b87026642ce0ade8bca4e01e6a89ce27fd4a55bed4f8837f6fd46e77ff7a3","sha256:a453ad0fee3d06d0b5b4b6d639d47c22f208690f6d61b2251cf28596ee770bc3"],"state_sha256":"b23273d776d1351742a0c72ceb425e234700393cec18c25b82afae79c1e4e57a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"USRK8LDlZhEE9z3kOmKJDm7NWp0+N5aFl4bqE0xMRA0iGJrpWkWYGC4SZMPLH1O/kohAYsBAEz7mfZNOLXKbAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T11:26:17.786766Z","bundle_sha256":"ea9370821c1787cdc23fcdafd4519b378ae121e374b4daba537259e5caec33a0"}}