# Tag Info

### Using system time in nano-seconds as source of entropy in a smart contract

Can I use last few digits of system time (in nano or milli seconds) as the seed? That not a good idea: It's hard to tell with which accuracy an adversary could get to know your system time. Often it'...
• 124k
Accepted

### Hotbits vs. Random.org vs. Anything else?

So, while the services you have mentioned are both providing relatively "discreet" randomness, while being publicly accessible, i.e. they don't display on a list all the random values that ...
• 7,246
Accepted

### Is this pseudo random function any good and/or original?

The code in the question implements any one of the $2^{65\times64}\approx2^{(2^{12.02})}$ "affine" functions from $\{0,1\}^{64}$ to itself, that is functions with the property \forall u,v,...
• 124k
I'm assuming that you're interested in those truly random seeds generated physically as part of a classic TRNG ($H_{in} > H_{out}$), and my answer is tailored accordingly. I would avoid random.org ...