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Wha is a security parameter in a pseudorandom generator?

us flag

F: {0,1}^λ → {0,1}^2λ is a secure pseudorandom generator, it says that λ is a security parameter, what does that mean?

us flag
Thank you! It is not a homework question, I am just very new to this and not sure where to start. Any points in the right direction? :)
us flag
Yes, G is secure
cn flag
@kelalaka the standard security definition of a PRG doesn't let you "send" anything.
us flag
I was a bit unsure about what is meant by "send"
kelalaka avatar
in flag
@Maeher you are right, I should talk about a distinguisher.
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