Lifetime evaluation of hot forged aerospace components by linking microstructural evolution and fatigue behaviour

AbstractThe present work aims at linking the local distribution of fatigue strength in a forged part to its manufacturing process. To this purpose, a predictive fatigue strength model for Inconel 718, also including the operating temperature, is derived from a reduced set of numerous microstructural parameters. The model is implemented, along with a microstructural evolution model from earlier work , into a finite element code in order to predict the local fatigue strength distribution in a component after being subjected to an arbitrary forging process

Comparison between Isothermal and Non-Isothermal Fatigue Behavior in a Cast Aluminum-Silicon-Magnesium Alloy

Для литого алюмосиликатомагниевого сплава A356.0, широко используемого для изготовления головок цилиндров дизельных двигателей, выполнен сравнительный анализ усталостных процессов при антифазном термомеханическом нагружении, а также при малоцикловом нагружении при комнатной и повышенной температурах. Проведены изотермические и неизотермические циклические испытания с контролем деформаций и температуры, моделирующие эксплуатационные режимы нагружения головок цилиндров.Для литого алюмосилікатомагнієвого сплаву A356.0, що широко використовується для виготовлення головок циліндрів дизельних двигунів, виконано порівняльний аналіз втомних процесів при антифазному термомеханічному навантаженні та при малоцикловому навантаженні за кімнатної і підвищеної температур. Проведено ізотермічні і неізотермічні циклічні випробування з контролем деформацій і температури, що моделюють експлуатаційні режими навантаження головок циліндрів

Forgery Attacks on FlexAE and FlexAEAD

FlexAEAD is one of the round-1 candidates in the ongoing NIST Lightweight Cryptography standardization project. In this note, we show several forgery attacks on FlexAEAD with complexity less than the security bound given by the designers, such as a block reordering attack on full FlexAEAD-128 with estimated success probability about $2^{-54}$. Additionally, we show some trivial forgeries and point out domain separation issues

Cryptanalysis of MORUS

Item does not contain fulltextAdvances in Cryptology - ASIACRYPT 2018 - 24th International Conference on the Theory and Application of Cryptology and Information Security, Brisbane, QLD, Australia, December 2-

Mind the Gap - A Closer Look at the Security of Block Ciphers against Differential Cryptanalysis

Resistance against differential cryptanalysis is an important design criteria for any modern block cipher and most designs rely on finding some upper bound on probability of single differential characteristics. However, already at EUROCRYPT'91, Lai et al. comprehended that differential cryptanalysis rather uses differentials instead of single characteristics. In this paper, we consider exactly the gap between these two approaches and investigate this gap in the context of recent lightweight cryptographic primitives. This shows that for many recent designs like Midori, Skinny or Sparx one has to be careful as bounds from counting the number of active S-boxes only give an inaccurate evaluation of the best differential distinguishers. For several designs we found new differential distinguishers and show how this gap evolves. We found an 8-round differential distinguisher for Skinny-64 with a probability of 2−56.932−56.93, while the best single characteristic only suggests a probability of 2−722−72. Our approach is integrated into publicly available tools and can easily be used when developing new cryptographic primitives. Moreover, as differential cryptanalysis is critically dependent on the distribution over the keys for the probability of differentials, we provide experiments for some of these new differentials found, in order to confirm that our estimates for the probability are correct. While for Skinny-64 the distribution over the keys follows a Poisson distribution, as one would expect, we noticed that Speck-64 follows a bimodal distribution, and the distribution of Midori-64 suggests a large class of weak keys

An Algebraic Attack on Ciphers with Low-Degree Round Functions: Application to Full MiMC

Item does not contain fulltextAdvances in Cryptology – ASIACRYPT 202