Guardian Angels

Fair Exchange with Guardian Angels

In this paper we propose a new probabilistic Fair Exchange Protocol which requires no central Trusted Third Party. Instead, it relies on a virtually distributed and decentralized Trusted Third Party which is formalized as a Guardian Angel: a kind of Observer e.g. a tamper proof security device. We thus introduce a network model with Pirates and Guardian Angels which is well suited for Ad Hoc ne...

Angels and Other Servants

In politics as in history, masters accomplish great things, but often, lowly beings such as servants perform those tasks. At times, they subvert them. In science, servant-beings are frequently described as demons and angels. Who are these effective agents? This essay traces parts of the large historical network of persons and places in which ‘little helpers’ service their master’s will. It look...

Angels Without Wings

Kidemonas: The Silent Guardian

Advanced Persistent Threats or APTs are big challenges to the security of government organizations or industry systems. These threats may result in stealth attacks, but if the attack is confronted before the attacker end goal has been achieved, the attackers could become aggressive by changing the mode of attack or by resorting to some form of contingency plan, which might cause unexpected dama...

Are Angels Preferred Venture Investors?

We examine the impact of business angels on 182 Series A financings and subsequent company outcomes. Our studied rounds have a varied mix of business angel and formal venture capital investors (VCs). We find that when only angels participate in a financing round and VCs are absent, control rights are more entrepreneur-friendly, legal expenses are lower, and investors are more geographically pro...