  The discovery and characterization of Algol eclipsing binaries (EAs) provide
an opportunity to contribute for a better picture of the structure and
evolution of low-mass stars. However, the cadence of most current photometric
surveys hinders the detection of EAs since the separation between observations
is usually larger than the eclipse(s) duration and hence few measurements are
found at the eclipses. Even when those objects are detected as variable, their
periods can be missed if an appropriate oversampling factor is not used in the
search tools. In this paper, we apply this approach to find the periods of
stars cataloged in the Catalina Real-Time Transient Survey (CRTS) as EAs having
unknown period (EA$_{\rm up}$). As a result, the periods of $\sim 56\%$ of them
were determined. Eight objects were identified as low-mass binary systems and
modeled with the Wilson \& Devinney synthesis code combined with a Monte-Carlo
Markov Chain optimization procedure. The computed masses and radii are in
agreement with theoretical models and show no evidence of inflated radii. This
paper is the first of a series aiming to identify suspected binary systems in
large surveys.
