Cryptography, in particular public-key cryptography, has emerged in the last 20 years as an
important discipline that is not only the subject of an enormous amount of research, but …

Message franking enables cryptographically verifiable reporting of abusive messages in end-
to-end encrypted messaging. Grubbs, Lu, and Ristenpart recently formalized the needed …

The ZK-STARK technology, published by Ben-Sasson et al. in ePrint 2018/046 is hailed by
many as being a viable, efficient solution to the scaling problem of cryptocurrencies. In …

Blockchain as a new technology has created a great amount of hype and hope for different
applications. There is a promise of a better, decentralised trust based on strict guarantees …

Cryptographic hashing modes come in many flavors, including Merkle-Damgård with
various types of strengthening, Merkle trees, and sponge functions. As underlying primitives …

The Internet played-and still-the key that continuously changing our ways of interaction with
people. As a result, several electronic services had emerged allowing businesses to grow by …

We refer to an access control system based on subjects and objects. Subjects are active
entities, eg processes, while objects are passive entities, eg messages exchanged between …

We cryptanalyze several symmetric encryption and hashing algorithms. A central factor in
the security of symmetric cryptographic algorithms is the resistance of their core building …

With reference to a classic protection system featuring active subjects that reference
protected objects, we approach the problem of identifying the objects that each subject can …

In this paper, we present preimage attacks on several hashing modes instantiating reduced-
round LBlock. It is observed that the omission of the network twist in the last round and the …