Some sibling assemblies come together when you install DotNetLightning or DotNetLightning.Core. These are mostly for internal usages but some might be useful for you:
Which contains managed code for aez cipher scheme.
It may be useful if you want to secure your data before saving it to disk. See official page for more details: https://www.cs.ucdavis.edu/~rogaway/aez/index.html
Which contains macaroon authentication token.
The API is mostly the same as libmacaroon (see libmacaroon's readme for the usage).
(Currently it is only supported in the BouncyCastle build, that is, not in the DotNetLightning.Core nuget package;
see https://github.com/joemphilips/DotNetLightning/issues/153 for more info.)