公开(公告)号：GB2562825B

公开(公告)日：2022-03-30

申请号：GB201803470

申请日：2017-02-24

Applicant: IBM

Inventor： JAN CAMENISCH ,  MARIA DUBOVITSKAYA ,  ANJA LEHMANN ,  GREGORY NEVEN

IPC: G06F16/13 ,  G06F21/62

Abstract: The invention performs anonymous read/write accesses of a set of user devices to a server. Write accesses of the user devices of the set comprise generating an encrypted file by an anonymous encryption scheme; computing a pseudorandom tag; indexing the encrypted file with the tag as user set index of the user set and writing the encrypted file and the associated tag to the a storage system of the server. Read accesses of the user devices of the set comprise downloading tag data corresponding to a plurality of tags from the server, the tag data enabling the user devices of a respective set to recognize so-called “own” tags computed by one of the user devices of the respective set of user devices; determining the own tags among the plurality of tags; reading one or more encrypted files associated to the own tags; and decrypting the encrypted files.

公开(公告)号：GB2562825A

公开(公告)日：2018-11-28

申请号：GB201803470

申请日：2017-02-24

Applicant: IBM

Inventor： JAN CAMENISCH ,  MARIA DUBOVITSKAYA ,  ANJA LEHMANN ,  GREGORY NEVEN

IPC: G06F17/30 ,  G06F21/62

Abstract: A method performs anonymous read/write accesses of a set of user devices to a server. Write accesses of the user devices of the set comprise generating an encrypted file by an anonymous encryption scheme (510); computing a pseudorandom tag (520); indexing the encrypted file with the tag as user set index of the user set (530) and writing the encrypted file and the associated tag to the storage system of the server (540). Read accesses of the user devices of the set comprise downloading tag data corresponding to a plurality of tags from the server (610), the tag data enabling the user devices of a respective set to recognize so-called "own" tags computed by one of the user devices of the respective set of user devices; determining the own tags among the plurality of tags (620); reading one or more encrypted files associated to the own tags (630); and decrypting the encrypted files (640).