pub trait TryCryptoRng: TryRng { }Expand description
A marker trait over TryRng for securely unpredictable RNGs
This marker trait indicates that the implementing generator is intended, when correctly seeded and protected from side-channel attacks such as a leaking of state, to be a cryptographically secure generator. This trait is provided as a tool to aid review of cryptographic code, but does not by itself guarantee suitability for cryptographic applications.
Formally, a CSPRNG (Cryptographically Secure Pseudo-Random Number Generator) should satisfy an additional property over other generators: assuming that the generator has been appropriately seeded and has unknown state, then given the first k bits of an algorithm’s output sequence, it should not be possible using polynomial-time algorithms to predict the next bit with probability significantly greater than 50%.
An optional property of CSPRNGs is backtracking resistance: if the CSPRNG’s
state is revealed, it will not be computationally-feasible to reconstruct
prior output values. This property is not required by CryptoRng.
Implementors of TryCryptoRng should only implement Default if a
default-constructed instance is itself a secure generator, for example
getrandom::SysRng which is a stateless interface.