The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2021
Filed:
Dec. 18, 2014
Nokia Technologies Oy, Espoo, FI;
Zheng Yan, Espoo, FI;
Nokia Technologies Oy, Espoo, FL (US);
Abstract
According to an example aspect of the invention, there is provided an apparatus comprising at least one processing core and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to receive, from a first user, a ciphertext, a first hash value and a first ciphered encryption key, receive, from a second user, a second hash value, responsive to a determination the first hash value is the same as the second hash value, obtain a re-encryption key, and apply the re-encryption key to the first ciphered encryption key to obtain a re-encrypted encryption key, the re-encrypted encryption key being decryptable with a secret key of the second user.