Without blindly claiming TC is backdoored, it does have an horrifically bad RNG which is housed in the application, and uses frantic wiggles of the mouse to generate seed values. Now depending on how much caffeine is in your system at the time, the values generated can differ quite substantially, ranging from super low (unsecure) entropy to 'fair game' entropy. Frankly I don't trust it one bit. If you consider how much room a mouse can potentially move within a typical desktop screen, the seed values are constrained within those params, always and forever.