{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:67QMV3VWWJFH4N3N2VXPUI2CI2","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":"7235fff04b9370d44007d2faf911a2d8bd504e13526196ef5e7f6b25931ef208","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2013-10-06T05:02:35Z","title_canon_sha256":"2bf3336a6455d7cffd35841e8b927b1dd2f5403cd8ec26d084228c0c0f6b5c95"},"schema_version":"1.0","source":{"id":"1310.1540","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.1540","created_at":"2026-05-18T03:11:00Z"},{"alias_kind":"arxiv_version","alias_value":"1310.1540v1","created_at":"2026-05-18T03:11:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1540","created_at":"2026-05-18T03:11:00Z"},{"alias_kind":"pith_short_12","alias_value":"67QMV3VWWJFH","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"67QMV3VWWJFH4N3N","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"67QMV3VW","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:f5f1572f5e3ee20cfa70c85664fb98f9991d26918fbd01de79d5e6c021ab05d1","target":"graph","created_at":"2026-05-18T03:11:00Z","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":"Existing captcha solutions on the Internet are a major source of user frustration. Game captchas are an interesting and, to date, little-studied approach claiming to make captcha solving a fun activity for the users. One broad form of such captchas -- called Dynamic Cognitive Game (DCG) captchas -- challenge the user to perform a game-like cognitive task interacting with a series of dynamic images. We pursue a comprehensive analysis of a representative category of DCG captchas. We formalize, design and implement such captchas, and dissect them across: (1) fully automated attacks, (2) human-sol","authors_text":"Chengcui Zhang, Manar Mohamed, Michael Georgescu, Niharika Sachdeva, Nitesh Saxena, Paul C. van Oorschot, Ponnurangam Kumaraguru, Song Gao, Wei-Bang Chen","cross_cats":["cs.HC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2013-10-06T05:02:35Z","title":"Three-Way Dissection of a Game-CAPTCHA: Automated Attacks, Relay Attacks, and Usability"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1540","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":"sha256:4c448eb97478f4d88b24364420225802fb13701c4d596820b261cd98af38ac29","target":"record","created_at":"2026-05-18T03:11:00Z","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":"7235fff04b9370d44007d2faf911a2d8bd504e13526196ef5e7f6b25931ef208","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2013-10-06T05:02:35Z","title_canon_sha256":"2bf3336a6455d7cffd35841e8b927b1dd2f5403cd8ec26d084228c0c0f6b5c95"},"schema_version":"1.0","source":{"id":"1310.1540","kind":"arxiv","version":1}},"canonical_sha256":"f7e0caeeb6b24a7e376dd56efa234246ba5ddbdfaba0b64d44c34ff2206bf540","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f7e0caeeb6b24a7e376dd56efa234246ba5ddbdfaba0b64d44c34ff2206bf540","first_computed_at":"2026-05-18T03:11:00.017626Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:00.017626Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uZ9qiZVG7Vj+69lX5IihQxby0/eByEg1vohyTdeIq84gBeZgEw3qH0UcrhJNTkJPNaTUwFqCOlLGbf6Fs89AAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:00.018554Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.1540","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4c448eb97478f4d88b24364420225802fb13701c4d596820b261cd98af38ac29","sha256:f5f1572f5e3ee20cfa70c85664fb98f9991d26918fbd01de79d5e6c021ab05d1"],"state_sha256":"ae9fec7ee342aee42b30face004dab6b4998d972ab3e66af93f6e135e2a9720f"}