A checksum is a value created from a binary file that can be used to validate its authenticity and integrity. An example of a checksum is MD4, MD5 and SHA-1.

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280 views

tool for maintain incrementally the checksum of a large set of files

I need a tool to generate and maintain the checksum (MD5, SHA1, it does not matter) of all files in a folder or a set of folders, recursively. Sometimes I will add/update/remove some files and I ...
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1answer
132 views

On Mac, after downloading a file, how to you do a checksum?

I want to do a checksum on a file I downloaded on my Mac. How can I do this?
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4answers
61 views

rsyncing - ignoring checksums

Trying to copy a bunch of data over and time, unfortunately, is of the essence. I'd like to do an rsync of all the data in one direction, pretty much rsync just clobbers what's over on the ...
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3answers
3k views

What are these Google SHA1 images? [closed]

If you look at this page you'll see an monochrome image. Above it says Tip: Use the SHA1 checksum shown to verify file integrity. However, I don't know if that's related. What are these ...
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1answer
1k views

What is the best way to make Calculate SHA1 as a context menu option in Mac OS X?

In order to calculate the SHA1 checksum of a downloaded file, I could type /usr/bin/openssl sha1 in Terminal and then drag there the file which I want check. To make it simpler, one could enable a ...
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2answers
285 views

Mass Checksumming tool for Windows?

I'm looking for a command line tool for windows that will go over a directory tree (recursively) and output a list of all the files in there, and a checksum for each file (can be CRC, MD5, whatever). ...
2
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1answer
625 views

Is it possible to check a FLV for data corruption?

I have some FLV videos and I'd like to check them for possibile data corruption, even if I'm able to play them without problems. I don't really know if FLV videos store an embedded checksum string for ...
2
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1answer
2k views

Is it possible to check a PDF for data corruption?

I have some PDF documents and I'd like to check them for possibile data corruption, even if I'm able to display them without problems. I don't really know if PDF documents store an embedded checksum ...
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3answers
2k views

A gigabit network interface is CPU-limited to 25MB/s. How can I maximize the throughput?

I have a Acer Aspire R1600-U910H with a nForce gigabit network adapter. The maximum TCP throughput of it is about 25MB/s, and apparently it is limited by the single core Intel Atom 230; when the ...
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1answer
420 views

Why am I getting boot errors after a fresh Windows install?

I have a really strange problem. I have a new laptop (no guaranty) and everytime after a clean installation everything is perfectly fine. But when the laptop is powered off for a couple of hours I get ...
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5answers
1k views

File checksum calculator for Windows [closed]

I'm looking for a light, fast hash/checksum calculator (eg. MD5, SHA1, etc.). I've been using HashCalc and it works fine enough, but I was wondering if there was something better. When downloading ...
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2answers
4k views

Keyboard error or no keyboard present

I've been fighting with this for a couple of weeks when booting my PC: Error keyboard or no keyboard present CMOS checksum error -Default loaded And of course there is no way to go any further ...
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3answers
1k views

Is there anything like HashTab for Linux?

I've recently installed Linux, and I know that you can use "md5sum filename" in terminal, but on Windows there is an AMAZING software called HashTab that incorporates it into the shell. Its awesome, ...
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1answer
186 views

md5sum only new files?

I have a directory containing files and an md5sum.txt file. I add a file new files to the directory. I would like add md5sum sums for all files that are not in md5sum.txt. Is there a simple way to do ...
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4answers
3k views

Single unix command to correctly transfer a large file?

I am trying to transfer a large (~3GB) file between two unix machines. I can use scp or rsync, but sometimes the transfer is corrupted. (I have to check manually.) I can split the file into pieces ...
2
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2answers
223 views

HTTP downloader with good integrity(hash..probably md5) checker built in [closed]

I'm trying to download xcode v3.2 from the Apple Developer Connection website, but everytime I download the huge file, it fails to mount due to a checksum error. It's really frustrating! BitTorrent ...
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2answers
558 views

TCP Checksum, why?

Why does TCP need a checksum, when lower layers do integrity checks anyways (like Ethernet CRC)?
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4answers
203 views

Why would I check my download against a checksum provided by a mirror site?

I thought the point of distributing md5 checksums was so the end user could verify the integrity of the download. If a high traffic site points me to a mirror site for download, why would I want to ...
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7answers
1k views

SFV Software Recommendations? [closed]

I'm looking for software recommendations for generating/validating SFV files (CRC32). I currently use "Easy SFV Creator", which is a great software but sadly it's no longer being maintained, and the ...