CAPTCHA: Using Hard AI Problems for Security.¶
von Ahn, L., Blum, M., Hopper, N. J., & Langford, J. (2003). CAPTCHA: Using Hard AI Problems for Security. Advances in Cryptology — EUROCRYPT 2003.
Cited by¶
1 citation across 1 artifact.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Access Friction
- In spam defense, CAPTCHAs and identity verification deliberately introduce friction that legitimate users pay once while abusers must pay per account.
This sourceIntroduces CAPTCHAs as a deliberate entry friction legitimate users pay trivially while automated abusers must pay per account — the canonical adversarial-design case of tuning friction type to exclude the adversary cheaply.
Supported in partVerified against the publisher's abstract
Backs the frame — CAPTCHA as a deliberate test humans pass and programs fail — but not the claim's once-vs-per-account cost asymmetry.
“We introduce captcha , an automated test that humans can pass, but current computer programs can’t pass”
- In spam defense, CAPTCHAs and identity verification deliberately introduce friction that legitimate users pay once while abusers must pay per account.
Verification¶
Does it exist? Confirmed. This work's DOI resolves to a registered record, which fixes its identity. That is all it fixes.
Does it back the claim? Read against the text for 1 of 1 citation: 1 supported in part. Each verdict is shown under its citation below, with what in the work backs the sentence.
Support is checked per citation rather than per work — the same source can be cited soundly in one article and wrongly in another. Per-citation recording began recently, so a citation with no recorded check is a gap in the record rather than evidence it went unchecked.
See how references were verified.
Registry ID ref:b6e773675329 · see in the full table