While each may have some virtue a single uniformly superior method has not emerged. The problems of cyclical repetition and the need to pass statistical tests for randomness still leave the issue ...

Virtual card numbers are temporary card numbers associated with a credit card account for use online to make those transactions more secure.

Projections indicate that obstructive sleep apnoea will affect 76·6 million adults aged 30–69 years across the USA in 2050, ...