Questions tagged [crc]
CRC stands for a Cyclic Redundancy Check, a method to verify the integrity of information, and detect errors in storage and communication.
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Correcting two-bit error using a CRC
What algorithm can be used to correct a two-bit error in a message protected by a 32-bit CRC, assuming the CRC polynomial allows that? I'm seeking something for 480-bit payload, able to detect ...
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Difference between CRC and Hamming Code
I am a bit confused on the difference between Cyclic Redundancy Check and Hamming Code. Both add a check value attached based on the some arithmetic operation of the bits in the message being ...
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Protecting data unequally using Error Correction Codes
Say I'd like to transmit a 100-bit packet which has a field containing a continuous value. I'd like to protect this value with an error correction code but an error in the MSB of this value is much ...
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Range of CRC-32
What is the range of “the” CRC-32, the one used by Unix, Ethernet, zip, and many other industrial standards?
Mathematically, a CRC is defined as follows: let $G$ be the CRC polynomial in $\mathbb{F}...
asked Nov 28 '13 at 0:33
Gilles 'SO- stop being evil'
37.4k7 gold badges100 silver badges166 bronze badges
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Numerically validate CRC performance
Koopman, P., & Chakravarty, T. (2004, June). Cyclic redundancy code (CRC) polynomial selection for embedded networks. In Dependable Systems and Networks, 2004 International Conference on (pp. 145-...
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Check if a given polynomial is primitive
I try to estimate error detection capabilities of arbitrary CRC polynomials. One important criteria is if a given polynomial is primitive. So I need an algorithm to check that. My goal is to write a C ...
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1answer
546 views
What is the error-detection-probability of CRC
I have a table which stores all serial numbers of devices in my system:
...
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1answer
62 views
Can one quickly update CRC codes based on small change and previous CRC code?
I asked this on StackOverflow, but, alas, no answers.
I'd like to use CRC or similar codes to check whether certain very large objects are likely to be identical. The trouble is, small parts of these ...
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1answer
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How to handle generator polynomial in CRC if given in (x+1) (x^3+ x^2 +1) form?
I am trying to find the frame check sequence in cyclic redundancy check(CRC). Given that the generator polynomial is $\ g(x)= (x+1)(x^3 + x^2 + 1)$. Let's say the data sequence is $\ 10110001$.
In ...
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1answer
42 views
using 2 short CRC(s) VS one longer CRC
I'm doing some research on the CRCs, but i can't find informations about the use of two (or more) short CRCs compared to the use of a longer CRC:
Suppose that i have a dataword A of some length and 3 ...
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1answer
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Polynomial generator required to detect single bit error in Cyclic Redundancy Check codes
I was reading about CRC coding from two books:
Data Communication and Networking by Forouzan Page 294
Computer Network by Tanenbaum Page 188
They use following notations:
$d(x)$: dataword to be ...
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1answer
134 views
Cyclic Redundancy Check Codewords Finding the Original Message
So I have the received transmitted message in polynomial form as
$$T'(X) = X^{15}+X^{13}+X^8+X^7+X^4+X^3$$
and the error polynomial as
$$E(X) = X^{16}+X^{13}+X^3$$
and the generator polynomial as
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138 views
CRC computation speed vs polynomials features
I tried to find information about how features of a CRC polynomials influence computation speed of implementations.
It is obvious that (depending from the CPU architecture the algorithm runs on) ...
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0answers
22 views
How to derive an algorithms that generates check sums [closed]
Column S contains the check sums of the values given in columns R and Xc. Does anyone here have an idea about how to find the corresponding algorithm to calculate the check sums? Thanks in advance
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How do I compute a “CRC code word” from an information word and CRC polynomial?
I have the CRC polynomial 1101, and my information word is 10001111. How do I find the CRC code word?
Disclaimer: This is an assignment problem. I'd appreciate any help, particularly solving the ...
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1answer
37 views
How to understand the CRC Algorithm from the CAN specification?
I am trying to understand how the cyclic redundancy check (CRC) algorithm from the Controller Area Network (CAN) specification works. Here is the pseudocode.
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Convert polynomial generator to binary form for crc [duplicate]
i have the polynomial generator x^3 + x
To convert to binary and i am unsure of the steps to complete. Help on how to convert various polynomials to binary would be greatly appreciated and i do not ...
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custom cc 16 bits with Polynomial and Initial Value , algorithm
I generate crc 16 bits with hex Workshop.
Polynomial :1234(hex) Initial Value :5678 (hex) . making it on 010 (ascii) and get 3744.
I looking for this algorithm , I prefer it on c#. but I not find ...
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134 views
CRC: false positive under some circumstances
Consider two computers $A$ and $B$. $A$ uses $G$ and $B$ uses $G'$ for the CRC computation. It is given that $\deg G \ne \deg G'$. Computer $A$ wants to send a data $D$.
The claim says that:
There ...
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1answer
99 views
CRC error detection
I know that to find an error in signal we have to divide given signal with given polynomial and if 0 remains there is no error. But if I have received signal: 0000 0101 0101 0000 1010 0101 and ...
