Questions tagged [nist]

The National Institute of Standards and Technology (NIST) is a U.S. federal agency that works with industry to develop and apply technology, measurements, and standards.

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1answer
49 views

What is the correct way to choose the start parameters for NIST tests? [duplicate]

I had an idea of creating a pseudo-random binary sequence with that code: ...
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1answer
42 views

Problem with Hash-DRBG's seedlen values (and others)

In NIST-SP-800-90Ar1, the Hash-DRBG is instantiated with hash functions using strange values for seed length (seedlen) such as 440, 888. How are these values derived? How to derive values for other ...
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1answer
45 views

NIST DRBG algorithms' optional parameter

As I'm going through NIST-SP-800-90Ar1 spec for DRBG, I found the mention of security_strength in all of the 3 specified construct in the document: Hash_DRBG, HMAC_DRBG, CTR_DRBG. However, they're all ...
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1answer
107 views

Why weak modes of operations are not banned?

If some modes of operations of AES are not secure (like ECB or CBC), which are prone to bit flipping / manipulation attacks, and why they haven't they been banned or advised against by NIST for other ...
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2answers
141 views

Statistical Analysis of Cryptographic Hashing Algorithms

I was wondering how can I use NIST Statistical Test Suite to check for the randomness of output generated by a cryptographic hashing algorithm, let say SHA-256? To be specific, how will I generate ...
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4answers
9k views

Why isn’t SHA-3 in wider use?

SHA-3 was released by NIST just over 4 years ago this week. In my experience it does not seem to be as widely used as I might have expected. I see SHA-2 and even SHA-1 more often. What are your ...
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1answer
53 views

Why does the NIST CTR DRBG apparently output the internal state when no additional input is given?

After reading through the specification of the FIPS CTR_DRBG in SP 800-90A (see Section 10.2.1), I got the impression that the output of the DRBG coincides with its internal state as long as no ...
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1answer
98 views

Interpretation of certain results of NIST Test Suite

I am using NIST Test suite on a PRNG and have a confusion regarding some specific results. Following is the part of the results: ...
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2answers
52 views

AIS31 Software and Documentation

I have learned that there are two main test suitcase for randomness (reference): AIS 31 - German Federal Office for Information Security (BSI) SP 800-90B - U.S. National Institute for Standards and ...
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1answer
83 views

NIST random excursion results

NIST specifies so-called random excursions test and random excursions variant test. From the description I can derive that the number of p-values should be 8 in the first case and 18 in the second. ...
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2answers
49 views

Help to understand the KDM in SP800-56A, and the usage of “FixedInfo”

Can somebody help me to understand the LOGIC behind Key-Derivation Methods (SP800 56A CH5.8)? This is my common understanding and please correct me if any wrong.. Alice and Bob can general individual ...
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2answers
77 views

Diffie-Hellman Primitives in SP800-56A

I wonder if someone can give an explain about the different between two Diffie-Hellman Primitives defined in SP800-56A, CH5.7.1 5.7.1.1 Finite Field Cryptography Diffie-Hellman (FFC DH) Primitive 5.7....
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1answer
102 views

NIST elliptic curves behaving anamolous in OPENSSL benchmark

I tried to collect some benchmarks on NIST elliptic curves using charm library. The charm library is just a wrapper over OPENSSL. I experimented with prime192v1 (P-192), secp224r1 (P-224), prime256v1 (...
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1answer
183 views

Naming convention for NIST elliptic curves in OPENSSL

NIST standardized 5 elliptic curves (P-192, P-224, P-256, P-384, P-521) for prime fields. When I looked into openssl, these curves are named as prime192v1, secp224r1, prime256v1, secp384r1, secp521r1. ...
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1answer
100 views

NTRUencrypt in NIST competition

Why did the NTRUencrypt team not maintain the NTRU1024 release in the NIST second-round competition? Is this because of the speed performance or security performance or other things?
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0answers
75 views

Is NIST testing all the round 2 submissions to quantum-resistant crypto?

Is NIST confirming the self-published quantum-resistant crypto round 2 data and do they make that available to the public when they do?
2
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1answer
81 views

Mapping between NIST test and TRNG features

Each of the NIST tests are generally explained in Random Bit Generation - Guide to the Statistical Tests. I was wondering if some one can help me understand them better. For example, which tests show ...
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1answer
323 views

What are the advantages of SM3 and SM4 compared to NIST-approved algorithms (SHA3 and AES)

Armv8.4-A will add extended support for more cryptographic primitives, to include SM3, which is a cryptographic hash function used in the Chinese National Standard; and SM4, a 128-bit block cipher; ...
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1answer
125 views

How does the Signature Scheme in Picnic Works

I am trying to understand how signature scheme proposed to NIST, Picnic, works. The propossal uses ZKboo and ZKboo++ as their basis. I can see how the ZKPoK works, where the witness x is some key ...
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1answer
115 views

Are there any NIST curves with pairings?

NIST FIPS.186-4 has standardized 5 ECC curves on field 𝔽𝑝 (P-192, P-224, P-256, P-384, P-521) and 10 elliptic curves on binary fields. None of them seem to have pairings. Are there any standard ...
3
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1answer
164 views

Why is the strength of an Elliptic Curve Cryptography (ECC) half the size of the prime field size?

I've looked around and couldn't find a direct answer. As a general rule, I've read from various sources (here here, and here) that the strength of an elliptical curve key is half of the size of the ...
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2answers
237 views

What's the reason for Monte Carlo tests for block ciphers?

NIST specifies that implementations were required to create Monte Carlo test vectors for ECB and CBC mode for the AES competition. What's the reason for these tests? The only thing I can think of is ...
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0answers
161 views

Signature Generation with RSA PKCS#1 v.15

I am trying to validate my RSA implementation for digital signatures with the test vectors provided by NIST. For now, I am focusing on the tests for signature generation (SigGen15) with the PKCS#1 v....
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1answer
89 views

NIST STS incorrect results for sample files

So I wanted to check the outcome of a hardware TRNG and see if its entropy is good enough. I downloaded the source files for statistical test suit from nist.gov website, compiled them on my macOS ...
2
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1answer
135 views

NIST security categories (post quantum)

Here (https://www.safecrypto.eu/pqclounge/round-2-candidates/) are collected all the proposals which passed the first round of NIST Post-Quantum Cryptography Standardisation process. What does the ...
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2answers
150 views

What are known metrics for TRNG?

I was wondering what the known metrics are for studying the randomness of TRNG (besides NIST tests). For example, for PUFs, there are known metrics such as uniformity, uniqueness, BER, etc.
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0answers
67 views

Participant workflow in the Cryptography competitions [closed]

I learned about the NIST hash function competition which generated SHA3. It says it inspired a Password hashing competition too, which resulted in Argon2. What I'm wondering is what people generally ...
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2answers
1k views

Is there a contingency plan in the event of a catastrophic attack on AES?

NIST selected Rijndael in 2000 to be AES. In a paper from the Serpent authors, they mention that there was the possibility of choosing a second cipher as a backup in the case of any severe breaks: ...
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1answer
102 views

Magic Number to calculate number of rounds for M-R in FIPS 186-4

In Fips 186-4, there is an algorithm in Appendix F (at page 117 in my copy of the 2013 version) to calculate the number of rounds of the Miller-Rabin primality test to random bases. Does anybody ...
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2answers
867 views

How did || come to be used in crypto texts to represent concatenation?

In RFC5647, NIST SP 800-38D, etc., || is used to denote concatenation. How did that come to be? In most programming languages ||...
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1answer
525 views

Equivalent RSA modulus for NIST P-192 and P-521 elliptic curves [duplicate]

At www.keylength.com, I found the following table of ECC field size and the corresponding RSA modulus recommended by NIST. ECC Modulus RSA Prime Size 160 1024 224 2048 ...
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2answers
438 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 ...
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0answers
101 views

NIST ECC Curves without pairings

NIST FIPS.186-4 has standardized 5 ECC curves on field $\mathbb{F}_p$ (P-192, P-224, P-256, P-384, P-521) and 10 elliptic curves on binary fields. I need to use ECC curves without pairings for my ...
2
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1answer
925 views

KDF based on X9.63 vs. NIST SP800-108

What is the difference between KDF based on NIST SP800-108 vs. the older one in ANSI X9.63? When should one be selected over the other? Thanks.
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0answers
266 views

Size of group for Elliptic curves vs RSA for equal security

For my research, I would like to compare the efficiency of a scheme when instantiated with Elliptic curves and RSA. So, I would like to know a "latest" comparison (as of 2018) on what group sizes of ...
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3answers
154 views

Is it correct to concatenate (pseudo-)random byte values before testing them with the NIST suite or tools like dieharder?

Let's assume I have thousands of (pseudo-)random 4-byte values. The values are 4 byte random values which a blackbox device gave me. I got these values by requesting them. In between others might have ...
2
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1answer
132 views

adaptation of NIST sp800-22 for short sequences

I would like to ask about the NIST test suite for randomness evaluation. The test suite consists of 15 subtests which evaluate the particular property of the sequence. In fact, each test has an ...
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1answer
276 views

C# equivalent of openssl ecparam -name prime256v1 -genkey -noout -out [closed]

I am having some issues generating a proper private key,I need it to be an Elliptic Curve private key suitable for use with NIST P-256 which i than need to convert to Base64-encoded private key in ...
0
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1answer
67 views

What does approved one-way function mean?

In one of their documents, NIST recommends using an approved one-way function, followed by a list of such functions, such as HMAC, KMAC, etc.. However, the wikipedia page says: Unsolved problem in ...
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2answers
195 views

Is the IEEE 1363.1 standard of NTRU post-quantum secure?

I have a question regarding the IEEE 1363.1 standard for NTRU with padding, which offers CCA security. Does the IEEE standardized implementation offer post-quantum security as well? Also, what are ...
3
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1answer
220 views

Is XTS-AES a NIST-approved nonce-misuse-resistant AES mode?

If I use XTS-AES and treat the tweak as a nonce/IV would the result be considered nonce-misuse-resistant? I'm thinking of something like the following AEAD-like scheme: ...
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2answers
864 views

Why is pqRSA in the NIST PQC submissions?

In the NIST post-quantum cryptography workshop, the round one submissions included pqRSA. If memory serves, this is an implementation of RSA using the product of a very large number of 4096-bit primes ...
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1answer
470 views

TLS: Risks of using a NULL cipher with encryption implemented in application?

We have a browser-launched JNLP/WebStart application that is no longer able to establish client-server CORBA/IIOP communications across TLS 1.0/1.1 due to relying on a cipher suite that uses an ...
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1answer
564 views

Does secp256r1 or secp256k1 use a=-3?

I saw a post here which I think states that for P256, a is equal to -3. Why is elliptic curve parameter $a=-3$ somehow special I am not sure if this is correct, or maybe I am misunderstanding ...
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2answers
342 views

NIST 800-90B /Non-IID track - min-entropy result > 8 for 8-bit symbol

I'm conducting an analyisis of noise sources based on the NIST 800-90B Non-IID track. Accordingly, I applied the non-iidmain.py script on a datarecord, which delivered the following output: ...
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3answers
748 views

How to interpret the entropy results for a NIST test file?

There is test data derived from pi that is supplied by NIST for validating their entropy measurement formulae listed in NIST's Recommendation for the Entropy Sources Used for Random Bit Generation. ...
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1answer
662 views

Do the NIST tools on GitHub measure entropy reliably? [closed]

There is a supposed NIST tool called SP800-90B_EntropyAssessment on that Git thing. It's designed to be used in accordance with NIST's Recommendation for the Entropy Sources Used for Random Bit ...
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2answers
273 views

Are my random numbers really “bad” or is that a statistical effect which “must” happen from time to time?

My software uses a TRNG (entropy source) which is part of an MCU. A check of random numbers generated by my software, carried out by a testing authority revealed a problem, which I have to examine ...
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1answer
2k views

What was NIST’s reason to switch naming from MD… (Message Digest) to SHA… (Secure Hashing Algorithm)?

When NIST introduced SHA-0 in 1993, they – for the first time – switched their naming convention from MD-n to SHA-n. Since both point to similar constructions (read: hashing algorithms with the same ...
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1answer
365 views

Why is counter mode encryption with a 16-byte cipher block not broken?

We determine a system IND-CPA secure when an adversary has a negligible advantage after any feasible amount of queries. AES256-GCM uses a 128bit block cipher. We know that the distinguishability ...