Questions tagged [hashing]

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59 views

Microsoft File Checksum Integrity Verifier (fciv.exe) not working/error

I'm attempting to hash every file on my C:\ drive with fciv.exe c:\ -r -md5 -xml hashes.xml The xml file does not initially exist, but after the command is entered, the xml file is created. The ...
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1answer
32 views

What is the OpenSSL equivalent of this given C# hashing code?

I've got C# server code which verifies a hash using the following logic. I have no control over the server code and cannot change it. string key = "xZBn34L4myg[...]cebvr7A=="; var hmacSha256 = new ...
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1answer
55 views

7-Zip. h (Hash) command. Calculate hash values for files. When you use it?

I use 7-Zip. I work in Windows 10 Home 64-bit. I use command line. From 7-Zip help I know there is h (Hash) command. Calculate hash values for files. Syntax h [-scrc{Method}] [files] Supported ...
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0answers
30 views

Hashcat i5 3470 opencl error clCreateContext(): CL_DEVICE_NOT_AVAILABLE

I have an Intel i5 3470 cpu and I am running Ubuntu 16. I downloaded the last version of Intel OpenCL (Intel® CPU Runtime for OpenCL™ Applications 18.1 for Linux* OS (64bit only)) and Hashcat. I ...
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1answer
88 views

change line starting with# with sed -i

I want to uncomment a line in /etc/apt/sources.list to enable canonical repo but it seems it has a problem with # character I tried -e but I can't figure out if I'm doing it correctly sed -i ' s/# ...
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0answers
33 views

How does a “passwd” and “adduser” command actually work on a LINUX OS?

(From a novice's point of view) The other day I was thinking about how a typical "passwd" command works in a LINUX OS. For example, when we type in "passwd", a prompt appears letting us type in our ...
2
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1answer
139 views

Do Outlook Emails or Email Threads have a unique identifier hash that can be used within the search syntax?

I just had a massive issue with a younger IT guy who was trying to communicate to me how to find an email thread he was referring to. It was a waste of time. Now I understand that email should be ...
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2answers
119 views

Can MD5 Hash be reversible or crack?

I try this link (https://md5.gromweb.com/) to hash some keys (lets say key A) and reverse it back which MD5 not suppose to be reversible right? Somehow, this website can do it easily. So, I found it ...
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0answers
21 views

Verify Windows updates on linux system

I need to manually verify Windows update files like windows10-kb....msu (and cab files) on a linux machine. The sha1 sums are integrated into the filename so creating the hash won't be difficult. But ...
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0answers
44 views

LDAP password comparison SSHA-512 by Vault Server

I'm running a Hashi-Corp Vault server and want to enable LDAP authentification. The passwords are SSHA-512 hased (i.e. {SSHA512}xxxxxx...xxx+ssss) This works fine with my freeradius but Vault seems ...
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0answers
15 views

How can I exchange a hash password for a newer one at AIX and Linux using shell script?

We have AIX and Linux machines that we can use puppet to change password automatically. But in some cases we need to do this manually. But I decide to write a script and change the old hash with a ...
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1answer
166 views

How should I structure my SHA-256 verification hash file(s) to make it the easiest for others?

I have been developing a major (to me) PHP library/framework kind of thing which I hope will power important applications of mine and maybe others in the future. I have so far not implemented any ...
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0answers
365 views

OpenSSL Digital Signature with ES256

I am trying to reproduce a valid signature for the JSON Web Token. I make the privat key with: openssl ecparam -genkey -name prime256v1 -noout -out private.pem also convert this from Pem to P8 with: ...
2
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2answers
161 views

get the hash of a string and eventually compare it to a hash

I want to run a one-liner to enable me to get the hash of a string and eventually compare it to a hash I can just copy at the end of the command later. I'm confident I can figure out how to do the ...
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2answers
530 views

shasum of a directory in macos

I'm writing a shell script that uses the shasum to check if the contents of a directory have changed. On Linux and FreeBSD, the shasum have the same behavior when I do shasum <directory> ...
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1answer
147 views

What is the hash for Utilman.exe

I've a Windows 8.1 machine, and have accidentally deleted Utilman.exe. I would like to know the EXACT SHA-256 hash of this version of the file. (64-bit OS, x64 processor, Windows 8.1) If there's ...
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0answers
85 views

rtorrent fails downloads over 4GB on raspberry pi

I'm running libtorrent/rtorrent master (13.7) on raspi 3b+ with raspbian. I can download torrents under 4GB in size without any problems (for example debian netinstall at around 290MB). However ...
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0answers
28 views

Hash changes just after operning a PDF file

Is it possible or normal that the hash value of a document changes just after the first opening of it? I used sha256sum function within Ubuntu terminal to check the hash values before and after the ...
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0answers
341 views

HUAWEI optical router password change

I have an optical router from Huawei, and I need to change my super user password. In a downloaded config file, I found this line: UserName="ADMIN_USER" Password="HASHED_PASSWORD" UserLevel="0" ...
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1answer
584 views

unzipping and re-zipping a file results in a different hash

I have an ev3 file called robot.ev3, when I ran file on it, the output I got was robot.ev3: Zip archive data, at least v2.0 to extract, I unzipped the file using unzip robot.ev3 -d robot moved into ...
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1answer
45 views

Since a copy was made, No corruption on Source drive or Target drive?

. Definition: A hash function is an algorithm that compresses messages of arbitrary length into short digests of fixed length. Would doing 3 hashes (md5, sha1, sha512) give more certainty than ...
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1answer
1k views

Where is the Windows 10 PIN stored?

I know that Windows 10 stores passwords in a NTLM hash in a SAM file. Where is the Windows 10 PIN hash stored?
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1answer
153 views

Windows 2008 R2 stand-alone: Change of hashing algorithm for user passwords

On a Windows 2008 R2 machine, which is not part of an AD-environment, the local account passwords are stored using unsalted MD4 hashes. Is it possible, to Change the hashing algorithm and enable ...
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1answer
105 views

Data corruption on copying: large files and small files

I know that files sometimes corrupted during copying, and for that reason people check them with hash sums. (MD5 or CRC32 seems to be OK for random errors). But usually, when I read about this use ...
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1answer
97 views

Powershell: result hash file verification Uppercase. It's ok?

I used PowerShell with the Get-FileHash command to verify the hash of a virtualbox installation file and the result was that the hash string generated by powershell matches but is in uppercase. The ...
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1answer
35 views

Windows 10 Only run a script that's unchanged?

I have a VHD that I want to auto mount in Win10. It seems I need to create a script to do this and then create a scheduled task to run it. I may be being paranoid, but how do I know that my script is ...
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0answers
26 views

Stop users from using vim to overwrite file

I have a program that's generating a hash file that only root has the permissions to read and write. Why am I still able to use vi to open it ( not being able to read anything ), then using the :wq! ...
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0answers
239 views

Using Hashcat to load a compressed wordlist

after researching a little bit i was able to find out that this is possible, but the people who were able to accomplish this didn't really post an example or command line to do so... The title says it ...
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0answers
36 views

How come after generating a screenshot at the same coordinates every time, files may sometimes have different hash signatures?

I am having a hard time figuring out the reason to this. I have a macro running that is screen capturing using snipping tool at the same exact coordinates every single time within a web site (a table) ...
0
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1answer
504 views

Recovering/Removing the BIOS password of a Toshiba Satellite M35-S320

I have this Toshiba Satellite M35-S320, with a BIOS password. The problem is, I was a bonehead and had no idea what I was doing when I set a (random) password. I forgot the password immediately. Is ...
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0answers
158 views

Reconstruct small file from hash values only [closed]

I am looking for if it's possible to losslessly recreate the original content of a text file only from a stored hash value (I prefer CRC checksum algorithm instead of others, because it's footprint is ...
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6answers
3k views

How to compare parts of files by hash?

I have one successfully downloaded file and another failed download (only the first 100 MB of a large file) which I suspect is the same file. To verify this, I'd like to check their hashes, but ...
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3answers
13k views

Get the fingerprint of an existing SSH public key

This Question asks about getting the fingerprint of a SSH key while generating the new key with ssh-keygen. But how does one get determine the fingerprint of an existing public key in a .pub file? ...
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1answer
168 views

How do i install gtkhash to windows 10?

My question is about how to install gtkhash to windows 10, as i can't seem to find any guides on how to. I have tried downloading gtkhash from https://gtkhash.sourceforge.io/ but all i got was a svg ...
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1answer
62 views

Why is your username AND password not hashed and salted? [closed]

Since common responses from Username and/or Password failure at logging is ALWAYS returned "Your Username OR Password are incorrect" due to increased security then why would systems not store the ...
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2answers
244 views

What is causing these two apparently identical files to have different hashes?

I am unable to figure out why the following two files are yielding different hashes (SHA1, CRC32, SHA384, whatever): https://cdn.jsdelivr.net/npm/jsonify-error@1.2.1/dist/jsonify-error.js https://...
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0answers
256 views

John the Ripper not fully using CPU

I'm using John the Ripper to crack an old ZIP archive encrypted with PKZIP, and although I've set the thread count to match the number of cores I have (4) only about 50-60% of my CPUs are being used ...
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5answers
24k views

How can I generate an MD5 sum for a folder on Windows?

There are several posts about generating MD5 sums for files and/or folders on various Windows platforms. However, none of these worked for me. I tried: Windows CertUtil: CertUtil -hashfile myFileName ...
17
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3answers
23k views

How to take sha256sum of file and compare to check in one line?

I keep on finding myself wanting to download and check the integrity of the download immediately in a script, but I haven't been able to find the right incantation of sha256sum. MY_SHA256=...
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1answer
91 views

Cannot open System File in Windows 10

I recently am trying to find my windows password after seeing some anti-virus software asked for my Windows credentials for me to log into my computer. So I thought I might be able to reach my own ...
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0answers
112 views

Windows 7 installer incorrect SHA-1 after copying .iso file

I have a Windows 7 Installer (x64, ultimate, SP1, u) on my NAS. I checked its SHA-1, and it was correct (starting with 36ae60de). I copied this .iso file to my pendrive (SanDisk Extreme with very high ...
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1answer
249 views

What might be the source/logic behind the hash values used by “Unified Logging” system on macOS?

This question was inspired by another question and answer thread regarding false-positives on a Mac for an—apparently—PC only virus/malware. My answer there posits that the hash ...
0
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1answer
205 views

Verifying dd-wrt checksum (old docs out of date)

Trying to install dd-wrt firmware on TP Link Archer C9 v1 (AC1900) router. Want to verify the integrity of my download, but can't find any hashes or checksums. Docs on the wiki about how to verify ...
0
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1answer
426 views

What algorithm is used to produce the 32 bit password key in an edit protected microsoft office (specifically word) document?

If you save a legacy (.doc era) word document with edit protection, you can find the password key stored within the file. For ease, this can be found by saving to an .xml or .html file and inspecting ...
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3answers
21k views

How to generate MD5 hash value for multiple files in a folder using cmd

As mentioned in this page, the command:CertUtil -hashfile yourFileName MD5can be used to obtain the MD5 hash value for a particular file. How can I find the MD5 hash values for multiple files in a ...
1
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1answer
192 views

How to get rid of STDIN string while using the following function in PowerShell and two other things?

I am working on Windows 8.1 Pro with PowerShell 5.0. Let's say I want to get a pure SHA-256 hash string of a file. I defined a following function: function sha256sum([string]$arg) { Get-...
1
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1answer
288 views

How do I check I copied a bunch of files and folders correctly from an MTP device?

That. Windows 10 Home, Android 7.1.2 device. I want to check if it copied right, as it's a backup.
1
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2answers
712 views

Find duplicate hashes

I have a bunch of files (4800 files), that I believe contain many duplicates and triples. Problem is that they don't also have the same names. I already weeded out the easy ones with same names. The ...
2
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3answers
830 views

How does Virustotal compute the hash?

When you select a file on your computer to be uploaded and analyzed by Virustotal it first computes the hash of the file to see if it hasn't already been scanned. How does the hash computation happen -...
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1answer
1k views

Create a 6 digit “hash” from a file

I need a tool to generate a 6-digit "hash" from a file. Naturally, identical files should always create the same hash. What is a good way to do this? This is required on a vanilla debian system. I ...