Ciphertext-Policy Attribute-Based Encryption and Re-Encryption

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Asim, Muhammad and Ibraimi, Luan and Petkovic, Milan (2010) Ciphertext-Policy Attribute-Based Encryption and Re-Encryption. Patent.

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Abstract:A ciphertext-policy attribute-based encryption system, comprising a re-encrypter (9) for cryptographically transforming a first ciphertext (CTp1) associated with a first access policy (P1) into a second ciphertext (CTP2) associated with a second access policy (P2) by means of a re-encryption key (RK). The system further comprises a re-encryption key generator (7) for generating the re-encryption key (RK), wherein the re-encryption key (RK) enables the re-encrypter (9) to cryptographically transform the first ciphertext (CTP1) associated with the first access policy (P1) into the second ciphertext (CTP2) associated with the second access policy (P2). Said re-encryption key generator (7) comprises a subsystem for encrypting a value derived from a pseudorandom number, thereby generating a further ciphertext associated with the second access policy (P2).
Item Type:Patent
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/78966
Official URL:http://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=0&adjacent=true&locale=nl_NL&FT=D&date=20110421&CC=WO&NR=2011045723A1&KC=A1
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