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IACR Cryptology ePrint Archive
A cryptosystem for granting/rescinding access permission is proposed, based on elliptic curve cryptography. The 'Organizational Cryptosystem' grants access permission not by giving secret (decription) key to the corresponding user but by converting the ciphertext so that the user can decript with their secret key. The 'conversion key' for the document, which is created from the secret key which the ciphertext has been originally encrypted for, the public key of the member who shall be permitteddblp:journals/iacr/GotaishiT18 fatcat:4napwkle2ncbfifyodoq6gf2aq