HMAC was proved in Bellare et al.(Advances in Cryptology–CRYPTO'96, Springer, Berlin,
Heidelberg, 1996) to be a PRF assuming that (1) the underlying compression function is a …

In general, management of medical data is achieved by several issues of medical
information such as authentication, security, integrity, privacy, among others. Because …

The ability to assess the reputation of a member in a web community is a need addressed in
many different ways according to the many different stages in which the nature of …

After more than six years from the launch of Bitcoin, it has become ev-ident that the
decentralized transaction ledger functionality implemented through the blockchain …

The most popular encryption scheme based on elliptic curves is the Elliptic Curve Integrated
Encryption Scheme (ECIES), which is included in ANSI X9. 63, IEEE 1363a, ISO/IEC 18033 …

A cryptographic hash function compresses arbitrarily long messages to digests of a short
and fixed length. Most of existing hash functions are designed to evaluate a compression …

Digital signature is the key issue in a number of innovative processes, such as
dematerialization, e-government, e-commerce, and e-banking. Digital signature ensures …

In this paper we study the security of summing the outputs of two independent hash
functions, in an effort to increase the security of the resulting design, or to hedge against the …

We present new techniques for the cryptanalysis of hash functions. Our contributions are two-
fold: both on the search level of the compression function and on the meta-structure. The …

The Bitcoin cryptocurrency relies heavily on a variety of cryptographic functions and
operations, which are currently assumed to be secure, but will inevitably be broken in the …