Security Concerns in Minimum Storage Cooperative Regenerating Codes

Abstract

Here, we revisit the problem of exploring the secrecy capacity of minimum storage cooperative regenerating (MSCR) codes under the (l2 l2)-eavesdropper model, where the eavesdropper can observe the data stored on l1 nodes and the repair downloads of an additional l2 nodes. Compared to minimum storage regenerating (MSR) codes which support only single node repairs, MSCR codes allow efficient simultaneous repairs of multiple failed nodes, referred to as a repair group. However, the repair data sent from a helper node to another failed node may vary with different repair groups or the sets of helper nodes, which would inevitably leak more data information to the eavesdropper and even render the ..