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## Search found 17 matches

Tue Oct 16, 2018 5:40 am
Topic: how to get the available space of chip?
Replies: 4
Views: 841

### Re: how to get the available space of chip?

but why the space size obtained by API is smaller than the actual space size?
Tue Oct 16, 2018 2:09 am
Topic: how to get the available space of chip?
Replies: 4
Views: 841

### how to get the available space of chip?

how to get the available space of chip?
Tue Sep 18, 2018 5:29 am
Forum: Algorithm School
Topic: About the random number generation tool
Replies: 4
Views: 1673

### Re: About the random number generation tool

RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. https://www.random.org/bytes/
Tue Sep 18, 2018 5:14 am
Topic: The range of ECC parameters N
Replies: 4
Views: 694

### Re: The range of ECC parameters N

(1) verify if n is a prime, if not, then invalid; (2) check if n satisify the equation: h*n*G = o; if verify h*n*G = o is not easy, you can verify h*(n-1)*G = -G. here, usually h = 1, so the equation becomes: (n-1)*G = -G, the left of the equation, is a kG computation; about the right side, if G = (...
Tue Sep 18, 2018 5:04 am
Replies: 3
Views: 701

this is the original DES specification: https://csrc.nist.gov/CSRC/media/Publications/fips/46/3/archive/1999-10-25/documents/fips46-3.pdf, but it was withdrawn on May 19, 2005, for related information, you can see: (1) Special Publication 800-131A, Transitions: Recommendations for Transitioning the ...
Tue Sep 18, 2018 4:29 am
Topic: How to set up SP800 random number test environment
Replies: 1
Views: 406

### Re: How to set up SP800 random number test environment

1. Download the NIST Statistical Test Suite from the following website: https://csrc.nist.gov/CSRC/media/Projects/Random-Bit-Generation/documents/sts-2_1_2.zip 2. Download NIST documentation (available at http://csrc.nist.gov/publications/nistpubs/800-22-rev1a/SP800-22rev1a.pdf); 3. perform the step...
Tue Sep 18, 2018 4:11 am
Topic: SP800 random number test, where can the latest standards come down?
Replies: 2
Views: 464

### Re: SP800 random number test, where can the latest standards come down?

https://csrc.nist.gov/publications/sp800
800-22 Rev. 1a A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications
Tue Sep 18, 2018 2:51 am
Topic: SP800 random number test, where can the latest standards come down?
Replies: 2
Views: 464

### Re: SP800 random number test, where can the latest standards come down?

Tue Sep 18, 2018 2:38 am
Topic: A question of PKCS5
Replies: 2
Views: 539

### Re: A question of PKCS5

(1) AES block size is not 32 bytes, it is 16 bytes;
(2) if the data is 16 bytes, you still need to pad 0x10 to the end until its length is 32bytes;
(3) you need to pad at any case, even if the length is times of block size.
Tue Sep 18, 2018 2:31 am