2020/10/08 by Fabian Schillinger, Schillinger, Fabian, Christian Schindelhauer +1
Computer Science · #Cryptography and Data Security #Internet Traffic Analysis and Secure E-voting #Privacy-Preserving Technologies in Data
paper · pdf · doi:10.48550/arxiv.2010.03859
In secure Online Social Networks (OSN), often end-to-end encryption\napproaches are used. This ensures the privacy of communication between the\nparticipants. To manage, store, or transfer the cryptographic keys from one\ndevice to another one, encrypted private storages can be used. To gain access\nto such storages, login credentials, only known to the user, are needed. Losing\nthese credentials results in a permanent loss of cryptographic keys and\nmessages because the storage is encrypted. We present a scheme to split\nencrypted user storages into multiple storages. Each one can be reconstructed\nwith the help of other participants of the OSN. The more of the storages can be\nreconstructed, the higher the chance of successfully reconstructing the\ncomplete private storage is. Therefore, regaining possession of the\ncryptographic keys used for communication is increased. We achieve high rates\nof successful reconstructions, even if a large fraction of the distributed\nshares are not accessible anymore because the shareholders are inactive or\nmalicious.\n