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Questions tagged [checksum]

A checksum or hash sum is a fixed-size datum computed from an arbitrary block of digital data for the purpose of detecting accidental errors that may have been introduced during its transmission or storage. The integrity of the data can be checked at any later time by recomputing the checksum and comparing it with the stored one.

A checksum or hash sum is a fixed-size datum computed from an arbitrary block of digital data for the purpose of detecting accidental errors that may have been introduced during its transmission or storage.

The integrity of the data can be checked at any later time by recomputing the checksum and comparing it with the stored one. This process doesn't guarentee the data hasn't been corrupted, but is a good indication.

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Different checksum but same archives

We generated two SHA-256 checksums for two archives (*.zip), which they suppose to have exactly the same contents. However, the two checksums are different. We checked the files and compare them between the two archives. Their contents are the same,…
user2968489
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why is FFMPEG framemd5 giving different audio sizes?

I am using FFmpeg framemd5 to verify that when I rewrap a Sony XDCAM "MP4" file to an MXF file I am not re-encoding the audio-video data. The "MP4" has a stereo file PCM audio stream, which has to be split into two mono streams for the MXF…
swami
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How to include the CRC32 of a file into it at a specific place?

I am working on a data generator in order to generate binary files into a closed system for which we assume there is no risk of external attacks nor any malicious intent. The idea is to find a way for these binaries to contain a quick and relatively…
someone
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Does anyone recognize a pattern in these checksums/CRC/Reed-Solomon, etc?

Does anyone recognize a pattern in these checkusms/CRCs, etc? The data of interest always falls in the range of ASCII characters, and is always the same length:UD1809T6587300000YBT03/02/18 Here is an example of the complete message: 69 27 FB 3A…
Robertjf
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How to Verify Integrity of Transferred Files in a Client Server Protocol

How do I implement integrity verification using the checksum of files in a client-server protocol where the client sends multiple files to the server. I am using the following steps: Client connects to the server and sends files. On server side,…
Shamminuj Aktar
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What kinds of checksums result in 2 digit hexadecimal?

Is there any checksum that results in 2 digit hexadecimal? I can only find NMEA Checksum... references: http://nmeachecksum.eqth.net/ http://en.wikipedia.org/wiki/NMEA_0183 I have some data file that I want to perform reverse engineering to find the…
DynamicScope
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Calculate crc8 dvb s2 in python

I need to calculate the crc8 dvb s2 checksum in python but I can't find any useful information on how this checksum really works, so I tried to convert this working C code: uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a) { crc ^= a; …
Nicola Guerrera
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Calculating a 16 bit checksum?

Working with a program in c that reads in a file and then I have to do both 8 bit and 16 bit checksum for a program.I only have 8 bit checksum done so far. This is what I understand I read the file and store the information in an array of characters…
Los
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How do I suppress the md5sum FAILED --check warning but still get the output?

If I have a file named file1. And I then make an md5 file for file1, I then change the contents of file1, so the md5 is different. When I run a checksum on it, I will get /home/student/.trashCan/file1: FAILED. This is what I want, however i also…
Amelia Magee
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Issue with PayTm Gateway Integration + CheckSum

Anyone help me to integrate Paytm Gateway with Android Application. I referred many tutorials. little bit confusing. I am using Android + java language. I dont have any Web Server with me (Many tutorials i have seen as checksum can be generated…
Thiruppathi Madhu
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CRC32 of an ELF file? Arbitrary length?

So I need to compute a CRC32 checksum of an ELF file, and I'm just struggling with C a bit. First thing I need to figure out is the best way to get the data into the checksum algorithm. If the ELF file is arbitrary size, and I'm trying to read it in…
Ethan Burke
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CRC Checksum iteration Java

I am trying to compute the crc checksum of two binary strings but I can only get the first iteration of the loop. Converting a string to a string array and then finally an int array. Error checking is done elsewhere. public String checksum(String…
Ricardo96MC
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checksum is same for different images

I am sending thousands of images from one system to another over FTP. Initially, I'll dump all the images, but later on, I want to send only those images which are changed. I haven't found any concrete solution to figure out changed images based on…
miserable
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(PL\SQL) Luhn check number generating

If I run a Luhn-formula check on a number sequence, and the return number is 0, the number sequence is valid (not randomly). I have a random number sequence, but I need a Luhn number generator, which return a number. This number should fill out the…
Black Cornail
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File Integrity check on large File Batches

What's the best recommended method/approach to check on the "file originality" of large quantities of files in a directory? Considering large quantities of files needed to transfer from one site to another site, there may possibility that the files…
Yong Cai
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