Quasi-One and quasi-two dimensional organic conductors consisting of TTF derivatives such as BEDT-TTF (bis-(ethylene-dithio)-tetra-thia-fulvalene) and TMTCF (C = S; TMTTF: tetra-methyl-tetra-thia-fulvalene, C = Se; TMTSF: tetra-methyl-tetraselena-fulvalene) have been well investigated in condensed matter physics because of interest in the emerging electric and magnetic properties, such as the s...

It is well understood that passwords must be very long and complex to have sufficient entropy for security purposes. Unfortunately, these passwords tend to be hard to memorize, and so alternatives are sought. Smart Cards, Biometrics, and Reverse Turing Tests (human-only solvable puzzles) are options, but another option is to use pass-phrases. This paper explores methods for making passphrases s...

Simple Password Exponential Key Exchange (SPEKE) is a well-known Password Authenticated Key Exchange (PAKE) protocol that has been used in Blackberry phones for secure messaging and Entrust’s TruePass end-toend web products. It has also been included into international standards such as ISO/IEC 11770-4 and IEEE P1363.2. In this paper, we analyse the SPEKE protocol as specified in the ISO/IEC an...

Group Password-Based Authenticated Key Exchange (GPAKE) allows a group of users to establish a secret key, as long as all of them share the same password. However, in existing GPAKE protocols as soon as one user runs the protocol with a non-matching password, all the others abort and no key is established. In this paper we seek for a more flexible, yet secure, GPAKE and put forward the notion o...

This paper brings the password-based authenticated key exchange (PAKE) problem closer to practice. It takes into account the presence of firewalls when clients communicate with authentication servers. An authentication server can indeed be seen as two distinct entities, namely a gateway (which is the direct interlocutor of the client) and a back-end server (which is the only one able to check t...

In Asiacrypt 2005, Abdalla et al. put forward the notion of gateway-based passwordauthenticated key exchange (GPAKE) protocol, which allows clients and gateways to establish a common session key with the help of an authentication server. In addition to the semantic security of the session key, their solution also provided additional security properties such as password protection with respect t...

Abstrak Masa pandemi covid-19 terjadi hamper diseluruh dunia yang menyebabkan kegiatan banyak orang harus kita hindari, serta jaga jarak dan pake masker, dimana salah satunya adalah proses belajar mengajar. Pemerintah Indonesia telah mengeluarkan kebijakan semua atau mengajar di lakukan rumah dengan sistem daring/online perguruan tinggi. Upaya ini dilakukan dalam rangka pencegahan penyebaran Co...

The static and dynamics properties of hydration water molecules in (±)-[Co(en)3]Cl3 were studied by means of 'H, H, and , 0 solid state NMR. By 'H pulsed field gradient (PFG) NMR the apparent diffusion coefficient of mobile water through a micropore along the crystalline unique c-axis was found to be 1.0 x 10~ m s 1 . The H NMR spectrum at 141 K consists of two components, one being a Pake doub...

A coupled system of two molecules bearing spins of 1/2, which are allowed to diffuse relative to each other, is considered. By using a symmetry-adapted basis operator set, the overall density matrix equation is decoupled into two equations for the time-resolved isochromat components, the sum of which yields the observed signal. The appropriate stochastic Liouville equation is solved by a combin...