Multi-Access Coded Caching with Secure Delivery

Authors

Image provided by K. K. Krishnan Namboodiri
K. K. Krishnan
Namboodiri
Indian Institute of Science
Profile
B. Sundar
Rajan
Indian Institute of Science

Abstract

The multi-access variant of the coded caching problem in the presence of an external wiretapper is investigated . A multi-access coded caching scheme with $K$ users, K caches and N files, where each user has access to L neighbouring caches in a cyclic wrap-around manner, is proposed, which is secure against the wiretappers. Each transmission in the conventional insecure scheme will be now encrypted by a random key. The proposed scheme uses a novel technique for the key placement in the caches. It is also shown that the proposed secure multi-access coded caching scheme is within a constant multiplicative factor from the information-theoretic optimal rate for .L\geq \frac{K}{2}. and .N\geq 2K..

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