{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:QYCNN5BKVS7KJXWQM7S4TO2GSI","short_pith_number":"pith:QYCNN5BK","schema_version":"1.0","canonical_sha256":"8604d6f42aacbea4ded067e5c9bb46923e3351a6686055bd3df925941e2bfcfa","source":{"kind":"arxiv","id":"1312.7444","version":1},"attestation_state":"computed","paper":{"title":"CAPTCHA Based on Human Cognitive Factor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CY"],"primary_cat":"cs.HC","authors_text":"Mohammad Jabed Morshed Chowdhury, Narayan Ranjan Chakraborty","submitted_at":"2013-12-28T15:28:23Z","abstract_excerpt":"A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is an automatic security mechanism used to determine whether the user is a human or a malicious computer program. It is a program that generates and grades tests that are human solvable, but intends to be beyond the capabilities of current computer programs. CAPTCHA should be designed to be very easy for humans but very hard for machines. Unfortunately, the existing CAPTCHA systems while trying to maximize the difficulty for automated programs to pass tests by increasing distortion or noise have consequently"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1312.7444","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2013-12-28T15:28:23Z","cross_cats_sorted":["cs.CY"],"title_canon_sha256":"5558030109837ff2c88ed85a47d67d25d05bb08d6180c96cc6efecf1bd8fd9e4","abstract_canon_sha256":"45c7ca7cf89e33e4a5e30fe62c70f99a54e2342e32e51c89937d4749c2e897fa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:03:43.485835Z","signature_b64":"4nIQ6DkO29H3SRhPIR70PObD4mtEK+1oAurlnAT4sMOT8rOmARLYGn0POD54+jCUovZuL6ZQiWJc/hCsu5nqBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8604d6f42aacbea4ded067e5c9bb46923e3351a6686055bd3df925941e2bfcfa","last_reissued_at":"2026-05-18T03:03:43.485196Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:03:43.485196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"CAPTCHA Based on Human Cognitive Factor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CY"],"primary_cat":"cs.HC","authors_text":"Mohammad Jabed Morshed Chowdhury, Narayan Ranjan Chakraborty","submitted_at":"2013-12-28T15:28:23Z","abstract_excerpt":"A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is an automatic security mechanism used to determine whether the user is a human or a malicious computer program. It is a program that generates and grades tests that are human solvable, but intends to be beyond the capabilities of current computer programs. CAPTCHA should be designed to be very easy for humans but very hard for machines. Unfortunately, the existing CAPTCHA systems while trying to maximize the difficulty for automated programs to pass tests by increasing distortion or noise have consequently"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.7444","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1312.7444","created_at":"2026-05-18T03:03:43.485343+00:00"},{"alias_kind":"arxiv_version","alias_value":"1312.7444v1","created_at":"2026-05-18T03:03:43.485343+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.7444","created_at":"2026-05-18T03:03:43.485343+00:00"},{"alias_kind":"pith_short_12","alias_value":"QYCNN5BKVS7K","created_at":"2026-05-18T12:27:57.521954+00:00"},{"alias_kind":"pith_short_16","alias_value":"QYCNN5BKVS7KJXWQ","created_at":"2026-05-18T12:27:57.521954+00:00"},{"alias_kind":"pith_short_8","alias_value":"QYCNN5BK","created_at":"2026-05-18T12:27:57.521954+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI","json":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI.json","graph_json":"https://pith.science/api/pith-number/QYCNN5BKVS7KJXWQM7S4TO2GSI/graph.json","events_json":"https://pith.science/api/pith-number/QYCNN5BKVS7KJXWQM7S4TO2GSI/events.json","paper":"https://pith.science/paper/QYCNN5BK"},"agent_actions":{"view_html":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI","download_json":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI.json","view_paper":"https://pith.science/paper/QYCNN5BK","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1312.7444&json=true","fetch_graph":"https://pith.science/api/pith-number/QYCNN5BKVS7KJXWQM7S4TO2GSI/graph.json","fetch_events":"https://pith.science/api/pith-number/QYCNN5BKVS7KJXWQM7S4TO2GSI/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI/action/timestamp_anchor","attest_storage":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI/action/storage_attestation","attest_author":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI/action/author_attestation","sign_citation":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI/action/citation_signature","submit_replication":"https://pith.science/pith/QYCNN5BKVS7KJXWQM7S4TO2GSI/action/replication_record"}},"created_at":"2026-05-18T03:03:43.485343+00:00","updated_at":"2026-05-18T03:03:43.485343+00:00"}