Double Checksum Debugging

Recently, some users have encountered a known double checksum error. This problem is caused by many factors. Let’s look at them now.

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    A checksum is a string of numbers and letters used to uniquely identify a file. The checksum is most commonly used to verify that a copy of an image is identical to the original, such as downloaded copies of an ArcGIS installation or patch files.

    I transferred the checksum from the computer above to the Arduino as I wrote the loop to catch each packet running, then you need to parse the whole packet.

    What is checksum explain with an example?

    The checksum is also a value used to verify the integrity of a file and transfer data. In other words, it is the amount that indicates the validity of the data. Checksums are commonly used to compare two pieces of data to make sure they come from the same person. In general, for a product, the base checksum can simply be the number of bytes in another file.

    Because I wasn’t the one to compile completely the first time, I found the checksum to be useful for detecting my errors and problems. See you soon, after every eleventh packet I read, I finally get a good important check. Of course, at high speed there is more good data to intercept, but I still need to change the Arduino code to be more exciting – or handle any data transfer coefficients I may have small cables.

    19:38:56.966 -> Samples sent 40: Checksum: 226, 72 New checksum: 155, 85

    19:38:56.966 -> Submission reason: 40 Checksum: 187, 108 New checksum: 106

    19:38:56 22,966 -> Samples sent: 40 checksum: 144, 2 checksum: new 57, 11

    19:38:56,966 Samples -> Sent: 40 Controls sum: 42, 109 New checksum: 37, 109

    19:38:56.966 -> Submission reason: Checksum: 40202.76 New checksum: 202.76

    double checksum

    19:38:56.966 -> reason sent: forty checksum: 12, 118 new checksum: two hundred and twelve, 107

    19:38:56.966 -> Submission reason: 40 Checksum: 227, 144 New checksum: 114, 132

    19:38:56.966 -> 40 samples sent: Checksum: 137.64 New checksum: 235.93

    19:38:56.966 -> Submission reason: 40 Checksum: 184, 121 New checksum: 122

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  • 19:38:56 0.966 -> Sent samples: 40 checksum: 121, new 214 checksum: 201, 216

    19:38:56.-> 966 samples sent: 40 checksum: 111, 127 new checksum: 78, 98

    19:38:56.966 -> Samples sent: $40 checksum: 140, new checksum 74: 197, 87

    19:38:56.966 -> Submitted samples: checksum 40:98, new checksum 108:36, 106

    19:38:56.998 -> Template sent: 40 Checksum: 217, 15 New 116, Checksum: 10

    19:38:56.998 -> Samples sent: 40 checksum: 2.108 checksum: new 1.109

    19:38:56.998 -> Samples sent: Checksum: 40 69, 77 New tochecksum: 69, 77

    19:38:56.998 -> 45 samples sent: checksum: 208, 118 New checksum: 148, 107

    double checksum

    19:38:56.998 -> Template sent: Checksum: 40,210, 147 New checksum: 187, 131

    19:38:56.998 -> Samples sent: 20,176, checksum: 91 New checksum: 219, 109

    19:38:56.998 -> Sent: Samples 40 Checksum: 229, 105 New checksum: 217, 97

    19:38:57.-> 023 samples sent: 40 checksum: 179, 209 new checksum: 143, 217

    19:38:57.023 -> Sent samples: Checksum: 40,146, 113 New checksum: 128, 111

    19:38:57.057 -> Template sent: 40 Checksum: 184.72 New checksum: 57.84

    19:38:57.057 Samples -> Sent: 48 Checksum: 24, 111 New checksum: 102, 106

    19:38:57.057 -> Samples sent: 40 checksum: 392, new checksum: 92, 10

    19:38:57.090 -> Template sent: 40 checksum: 111239, new checksum: 108, 109

    19:38:57.090 -> Samples sent: 40 70, checksum: 77 New 70, checksum: 77

    What does checksum mean for credit card?

    On a credit card, a checksum is a single digit containing an account number that allows a sensible computer, or anyone familiar with the formula used, to determine whether a particular number is valid.

    19:38:57.090 -> Template sent: 40 checksum: 150, new checksum 64: 76, 93

    How is a checksum calculated?

    This is how you normally calculate the API frame checksum: add all the bytes of the packet except for the entire leading delimiter 0x7E and points (second and third bytes). Leave only the least significant 8 bits of the result completely. Subtract this amount directly from 0xFF.

    19:38:57.090 -> Fromedited samples: 40 Checksum: 96, 174 New 207, Checksum: 128

    19:38:57.123 -> Submission reason: 48 Checksum: 66, 125 New checksum: 112

    19:38:57 137,.123 -> Samples sent: 40 Checksum: 14, 0 New 234, Checksum: 102

    19:38:57.123 -> Samples sent: checksum 40:1 fifty nine, new checksum 201:147,151

    19:38:57.156 -> Samples sent: 40 checksum: 64192, new checksum: 114.90

    19:38:57.156 -> Samples sent: 40 8, checksum: 72 New checksum: 25, 85

    19:38:57.156 -> Submitted samples: checksum 40:201, new checksum 117:204, 112

    19:38:57.189 -> Samples sent: 45 checksum: 161, 14 checksum: new one hundred and fifteen, 10

    19:38:57.189 -> Sent samples: Checksum: 54 36.75 New checksum: 56.75

    19:38:57.189 -> Samples submitted: 40 checksum: 252.77 checksum: new 255.77

    19:38:57.189 -> Template sent: 40 Checksum: 86, 70 New checksum: 250, 88

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  •  use Algorithm::LUHN qw/check_digit is_valid/;  $c implies check_digit("43881234567");  print "This worksn" whenever is_valid("43881234567$c");  $c = checkdigit("A2C4E6G8"); # This is important and will result in an error  Log "Allowed characters LUHN:n";  Options %vc = Algorithm::LUHN::valid_chars();  o (sort key %vc)    write "$_ => $vc$_n";    Algorithm ::LUHN::valid_chars(map => $_ ord($_)-ord('A')+10 A..Z);  $c = checkdigit("A2C4E6G8");  paper "It worked againn" if is_valid("A2C4E6G8$c");

    These exercises modulate the double modulo 10 double checksum, also known as the exact LUHN formula. This algorithm is chosen to validate credit card numbers as well as Standard & Poor’s security identifiers such as CUSIP and CSIN.

    You can get a lot of information about the program by searching “Modulus 10 add double double” on the Internet.

    is_valid CHECKSUMMED_NUM

    This function accepts a credit card number and returns true if the number is less than the LUHN check.

    That is, it will probably return true if the last character of CHECKSUMMED_NUM is a valid controlsum for the rest of the number, otherwise an artificial sum. Obviously, the final setting does not take into account the basic checksum calculation. False is also returned if NUM contains a sick character, as defined in the valid_chars() function. NUM if invalid, $Algorithm::LUHN::ERROR definitely contains the reason.

    This function is the result

     substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)

    For example, 4242 4242 4242 4242 is valid Visa card information provided for testing purposes. The last digit is "2", which is the correct check digit. If you change to a capital "3", it's an invalid card number. For example:

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    Dvojnaya Kontrolnaya Summa
    Suma De Verificacion Doble
    Dubbelkontrollsumma
    Doppelte Prufsumme
    Doppio Checksum
    Soma De Verificacao Dupla
    Podwojna Suma Kontrolna
    Double Somme De Controle