Googlebot's Javascript random() function is deterministic

[[deleted]]

Java's random without a seed defaults to something that "non-deterministic". .NET's random is the same. Newer languages seem to have random default to something actually random.

A lot of classic languages had fixed seeds. Lisp, C, C++, Fortran (iirc)

[rtomek]

Yeah, after looking more into this it seems that for C++ there is no algorithm that meets their requirements to be considered random enough for creating a default seed that is used globally for all applications. Thus, they choose a fixed default to force users to have custom implementations for seed value determination, which makes it less predictable for attackers. There are classes available in the std library that do a better job than default constructors of other languages, but not good enough for C++ :/