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:
Dec. 25, 2018
Filed:
May. 21, 2015
Bitcasa, Inc., San Mateo, CA (US);
Jeff Gregory, Mountain View, CA (US);
Tom Hill, Los Altos, CA (US);
Marcos Klein, Mountain View, CA (US);
David C. Lawrence, Hayward, CA (US);
Joel Ward, San Francisco, CA (US);
PUCCINI WORLD LIMITED, Wanchai, HK;
Abstract
A method and apparatus for securing a directed acyclic graph (DAG) is described. In one embodiment, an algorithm enables encryption of a DAG given a start node (an entrypoint), the node key for that node, and a path to traverse in the graph. A unique and cryptographically random key is generated for each node (sometimes referred herein as a unique node key). The node key encrypts the node it is generated for and also any edges exiting the node. The node key is stored on the incoming edge to the node (the edge from its parent node) encrypted with the node key of the parent node. Storing the keys on the edges of the DAG instead of on nodes of the DAG enables efficient querying of the DAG and the ability for a node to have multiple parents that may change without affecting the node's relationship with the non-changing parents.