English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Preventing abuse of web services by bots is an increasingly importantproblem, as abusive activities grow in both volume and variety. CAPTCHAs arethe most common way for thwarting bot activities. However, they are oftenineffective against bots and frustrating for humans. In addition, some recentCAPTCHA techniques diminish user privacy. Meanwhile, client-side TrustedExecution Environments (TEEs) are becoming increasingly widespread (notably,ARM TrustZone and Intel SGX), allowing establishment of trust in a small part(trust anchor or TCB) of client-side hardware. This prompts the question: can aTEE help reduce (or remove entirely) user burden of solving CAPTCHAs?  In this paper, we design CACTI: CAPTCHA Avoidance via Client-side TEEIntegration. Using client-side TEEs, CACTI allows legitimate clients togenerate unforgeable rate-proofs demonstrating how frequently they haveperformed specific actions. These rate-proofs can be sent to web servers inlieu of solving CAPTCHAs. CACTI provides strong client privacy guarantees,since the information is only sent to the visited website and authenticatedusing a group signature scheme. Our evaluations show that overall latency ofgenerating and verifying a CACTI rate-proof is less than 0.25 sec, whileCACTI's bandwidth overhead is over 98% lower than that of current CAPTCHAsystems.

CACTI: Captcha Avoidance via Client-side TEE Integration