2k views

Differences between methods of hardware random number generators

I'm reading about various hardware random number generators which - among others - implement the following approaches: Analog-to-digital converter noise Johnson–Nyquist noise Reverse biased ...
3k views

How do I calculate a password space if the password only has eight alphabetic characters (not case sensitive)

I read this wiki article and saw this formula for random password's information entropy. Also the wiki article mention that the symbol count for non case sensitive is 36. Is there a way I can ...
1k views

Noisiest RF band for random number generation

I've been looking into the difference between PRNGs and proper RNG techniques. One that I particularly like is the idea of tuning a radio to a certain frequency and bandwidth and just listening to the ...
688 views

Hardware RNG Bias

I have generator based on sampled noise (reverse-biased transistor - actually ChaosKey but that's not that important). The noise source is fed into ADC and sampled with 16bit resolution (2 bytes). ...
914 views

NIST randomness test p values

I have a binary sequence of length $2^{20}$. I am using the NIST statistical test, assess. What should be taken for ./assess and ...
305 views

Verifying randomness and uniqueness of TRNG output

We need to verify two claims about a set of numbers: They are random They are unique in the set (the set is about 200 billion (2TB bin storage)) Supposedly, the numbers were generated by a TRNG (...
227 views

Why should one model an entropy source in order to build a TRNG?

Some assert that a theoretical model of the unconditioned source must be created when building any TRNG. It's believed to be a fundamental requirement. So a few related questions arise:- What is a "...
1k views

Any concrete examples of the use of NIST Special Publication 800-90B?

This question relates to NIST Special Publication 800-90B, Recommendation for the Entropy Sources used for Random Bit Generation. A copy is available here. Can anyone supply a pointer to any ...
1k views

Shannon entropy of string, not same in Binary form? But just as good as a password?

This string, "Au+u1hvsvJeEXxky" has a Shannon entropy of 3.75 and a length of 16. The binary form of the string ( derived from Ascii-table ) is: 01000001 01110101 ...
289 views

How can Bob quickly generate thousands of letters randomly while strongly mitigating the risk of compromise?

Bob wants to generate four thousand English letters for a proper one-time pad without resorting to hand-thrown dice, despite the advantages. Rolling dice would be too slow and tiresome. Bob does not ...
2k views

How can I calculate the entropy of an image? [closed]

I am searching how can I calculate the entropy of a image for a Capture The Flag. I know what is the entropy theory and I tried a pair of things: Convert the jpg image on binary image and calculate ...
261 views

Is a cryptographic key of size $N$ equivalent to $N$ bits of entropy?

Are there any caveats to the claim that a cryptographic key of size $N$ bits and $N$ bits of entropy are equivalent?
887 views

Interpretation of (NIST) Non Overlapping Template Matching Test

Regarding the Non-Overlapping Template test, this test normally gives us a bunch of p-values (148 values). I would like to ask that how do we interpret those values into a single p-value for ...