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 $N\geq 2K$.

翻译：在有外部窃听器的情况下,对编码缓存问题的多存取变式进行了调查。对由美元用户、美元缓存和美元文件组成的多存存取编码缓存方案进行了调查。根据该方案,每个用户都可以以环环包装方式获取相邻的美元缓存,对电线应用者是安全的。常规无保障方案中的每次传输将使用随机密钥加密。拟议方案使用新技术在缓存器中放置钥匙。还显示,拟议的安全多存编码缓存方案是在信息理论最佳费率($L\geq\frac{K ⁇ 2}和$N\geq 2K$)的固定倍增系数之内。