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Traceable Cross-Domain Data Sharing With Expressive Keyword Search
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Summary
Researchers propose TCroS, a traceable cross-domain data sharing scheme for Internet of Vehicles data, which generalizes CP-ABE via proxy re-encryption so ciphertexts from one domain can be transformed for authorized requesters in another. Requester identities are embedded in decryption keys using Boneh-Boyen signatures, so any party can trace the source of a leaked key without a universally trusted authority. An extension, TCroSS, adds privacy-preserving expressive keyword search with Boolean queries, and the authors report IND-SCPA and IND-SCKA security with overheads comparable to single-domain settings.