Oliver Hohlfeld

Distributed Cloud Computing

2015 · ACM SIGCOMM Computer Communication Review

A distributed cloud connecting multiple, geographically distributed and smaller datacenters, can be an attractive alternative to today's massive, centralized datacenters. A distributed cloud can reduce communication overheads, costs, and latencies by o ering nearby computation …

Digging into Browser-based Crypto Mining

2018

Mining is the foundation of blockchain-based cryptocurrencies such as Bitcoin rewarding the miner for finding blocks for new transactions. The Monero currency enables mining with standard hardware in contrast to special hardware (ASICs) as often …

The Boon and Bane of Cross-Signing: Shedding Light on a Common Practice\n in Public Key Infrastructures

2020 · arXiv (Cornell University)

Public Key Infrastructures (PKIs) with their trusted Certificate Authorities\n(CAs) provide the trust backbone for the Internet: CAs sign certificates which\nprove the identity of servers, applications, or users. To be trusted by\noperating systems and browsers, a …