SCA

SCA is an acronym that can refer to several concepts across different fields.

Strong Customer Authentication (SCA) is a requirement under the European Union's PSD2 directive that aims to make online payments more secure. Most payments must be authenticated using at least two independent factors, such as a password, a mobile device, or biometrics. Exemptions exist for low-risk transactions, but the rule can introduce additional steps for users during online purchases.

The Society for Creative Anachronism (SCA) is an international nonprofit organization dedicated to researching and recreating pre-17th-century history. Members participate in arts, crafts, martial activities, and community education at events and exhibitions, spanning many countries and cultures.

Spinocerebellar ataxias (SCAs) are a group of hereditary neurodegenerative disorders characterized by progressive gait imbalance and coordination problems. They are caused by various genetic mutations and vary in age of onset and severity, with symptoms often including ataxia, dysarthria, and eye movement abnormalities.

Single-cell analysis (SCA) refers to methods that study biological processes at the level of individual cells. Techniques include single-cell sequencing and imaging to reveal cellular heterogeneity in tissues, supporting research in development, cancer, neuroscience, and immunology.

Software composition analysis (SCA) tools identify open-source components in software projects, helping manage licensing, security vulnerabilities, and compliance. These tools support software governance by mapping components to licenses and known vulnerabilities.

Svenska Cellulosa Aktiebolaget (SCA) is a Swedish multinational dedicated to forest products, including pulp, paper, packaging, and forestry operations. The company has undergone structural changes and strategic shifts, reflecting broader trends in the Nordic forest-products industry.