# [−] [src] Trait rand::CryptoRng

    pub trait CryptoRng { }

A marker trait used to indicate that an [`RngCore`] or `BlockRngCore` implementation is supposed to be cryptographically secure.

Cryptographically secure generators, also known as CSPRNGs, should satisfy an additional properties over other generators: 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%.

Some generators may satisfy an additional property, however this is not required by this trait: if the CSPRNG's state is revealed, it should not be computationally-feasible to reconstruct output prior to this. Some other generators allow backwards-computation and are consided reversible.

Note that this trait is provided for guidance only and cannot guarantee suitability for cryptographic applications. In general it should only be implemented for well-reviewed code implementing well-regarded algorithms.

Note also that use of a `CryptoRng` does not protect against other weaknesses such as seeding from a weak entropy source or leaking state.

## Implementations on Foreign Types

### `impl<'a, R> CryptoRng for &'a mut R where
R: CryptoRng + ?Sized,` [src]

### `impl<R> CryptoRng for BlockRng<R> where
R: BlockRngCore + CryptoRng,` [src]

### `impl<R> CryptoRng for Box<R> where
R: CryptoRng + ?Sized,` [src]

### `impl CryptoRng for ChaCha8Rng` [src]

### `impl CryptoRng for ChaCha12Rng` [src]

### `impl CryptoRng for ChaCha20Rng` [src]

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## Implementors

### `impl CryptoRng for EntropyRng` [src]

### `impl CryptoRng for OsRng` [src]

### `impl CryptoRng for StdRng` [src]

### `impl CryptoRng for ThreadRng` [src]

### `impl<R, Rsdr> CryptoRng for ReseedingRng<R, Rsdr> where
R: BlockRngCore + SeedableRng + CryptoRng,
Rsdr: RngCore + CryptoRng,` [src]

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