For my study project I investigate encrypted computation, or program obfuscation. This is an interesting concept for its own sake, but also because a successful scheme would allow a program running on an untrustworthy system to carry and use secret cryptographic keys securely. A symmetric-key encryption scheme becomes a public-key scheme by obfuscating Ek(·); an obfuscated mobile software agent...

In this paper, I focus on CIA agent Carrie Mathison of the US TV series Homeland. The blond, young and very intelligent analyst is a splendid example sustainability efficiency in politics. Scrutinizing 1 8, hence first last series, demonstrate how Mathison’s activities decisions are sustainable effective for her employer, CIA. Naturally, Homeland fiction, but fiction can inspire political theor...

This article proposes efficient solutions for the construction of sealed-bid second-price and combinatorial auction protocols in an active adversary setting. The main reason for constructing secure auction protocols is that the losing bids can be used in the future auctions as well as negotiations if they are not kept private. Our motivation is to apply verifiable secret sharing in order to con...

A (t, n)-threshold secret sharing scheme is a method to distribute a secret among n participants in such a way that any t participants can recover the secret, but no t − 1 participants can. In this paper, we propose two secret sharing schemes using non-abelian groups. One scheme is the special case where all the participants must get together to recover the secret. The other one is a (t, n)-thr...

Article history: Received 15 December 2009 Received in revised form 14 April 2010 Accepted 17 April 2010