Questions tagged [sha1]

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3answers
285 views

Why Outlook client's S/MIME settings use SHA1 as the default Hash Algorithm for digital signing a message?

can someone tell why Outlook client S/MIME settings use SHA1 as the default Hash Algorithm? Doesn't that put the certificate private key to a risk when weak algorithm is used? Or am I ...
6
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1answer
2k views

How to check if your ssh keys are in the ssh-rsa2 format?

So recently there were news of OpenSSH dropping support for SHA-1 logins and I am trying to understand which format they are referring to. Since years i've been generating keys via ssh-keygen -t rsa -...
0
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1answer
26 views

SSH-256/512 RSA taking “long” to login

Up to now, I have been using putty + pageant 0.66 to ssh from my Win 10 client to a couple of Linux servers, as in Comp A Comp B Comp C Win 10, Msys2 --...
6
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1answer
6k views

How to check SSH key version locally

In general i'm searching for a method to show information about a private or public SSH key without contacting a server, like keylength, algorithm, ssh version and so on. Especially I like to know if ...
0
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1answer
94 views

How can I compare a full directory's checksum between platforms?

I have a directory full of files and subdirectories on a Win7 machine. I want to archive them, so I compress and move them to archival storage. Before compression, I use the CRC context menu to ...
0
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0answers
828 views

This digital signature is invalid and cannot be trusted. The macros will be disabled

I am using MS Excel containing macro at customer place for some automation in excel. When the customer opens excel containing macro with the valid EV digital signature (Also tried with previously ...
1
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1answer
2k views

Derive sha1 hash from openssl binary base64 value

Digital Cinema Packages contain checksums in the following format as described here: $ openssl sha1 -binary 'dcpfile.xml' |openssl base64 IxcfhXNHlw+1bbDFu0kp8KRylpU= How can I take a value such as ...
0
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1answer
49 views

sha1sum from commandline different from other sources

I have sha1sum installed on an Ubuntu 16.04 system and used it like this to compute an sha1 sum: root@computer:# echo 1234 | sha1sum 1be168ff837f043bde17c0314341c84271047b31 - also I computed the ...
0
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1answer
435 views

Windows 7 PCI Compliance Regarding SSL, SHA-1, TLS-1 Vulnerabilities

How do I turn off SSL, TLS-1 support in Windows 7 to be in compliance with PCI standards? Also, I need to remove an SHA-1 certificate. I did some searching and found I can run the "MMC" tool, then add ...
1
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1answer
3k views

How reliable are SHA1 sum and MD5 sums on very large files?

I constantly transfer disk images and virtual machine images (usually 800GB to nearly 1 TB per file) to a cloud server via rclone using SSH, and I wonder how reliable are sha1sum and md5sum when it ...
0
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0answers
207 views

Get SHA1 Checksum from GPG key?

I'm doing a encryption experience but need some help. I found a Private GPG Key while decrypting an image. Now, what can I do with this key? The answer I need to find are the first 5 characters of a ...
10
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2answers
12k views

Why are Root CAs with SHA1 signatures not a risk

Take Verisign's website, for example, which has a root CA with a sha1 hash signature. Am I mistaken with understanding that were one to find a collision, they could impersonate the Verisign root CA, ...
2
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1answer
298 views

Sha1Sum on kali.org

I am unable to download kali linux from their official website kali.org. I try to verify the sha1sum but all I get is invalid https://gyazo.com/2e02792c685fbd2ebfd50e04fe218501. Any ideas? I can ...
1
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2answers
1k views

How to transparently substitute sha1sum for shasum in sh shell?

I have a test that needs to run on multiple platforms. On all other platforms, the test uses sha1sum, but on my Mac OSX El Capitan, there is no such program installed, but shasum works fine as a ...
4
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1answer
177 views

Different SHA1 result every time I check, bad drive?

I was attempting to download and run the Windows 10 Insider Preview, but after a few failed boots and installation errors, I decided to test the SHA1 sum before committing. I noticed that every time ...
34
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8answers
12k views

Can a file be maliciously changed in a way that maintains its original SHA-1 Hash?

According to this article, and many others, SHA-1 is not secure. In my case, I am not concerned about passwords or digital certificates. I am concerned about file integrity. Is it reasonably ...
1
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1answer
3k views

How to get sha1sum to work on Mac OS X?

I have an application that I'm porting and as part of the test suite, I run sha1sum. I'd like to have test code that works on all my platforms and not vary across platforms. Mac OS X, is the first ...
0
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1answer
3k views

Checksums don't match is that bad?

I recently started looking at VisualStudio 2012. I tried downloading it from the official Microsoft link but it failed with some errors. As of some suggestions I downloaded the DVD5 ISO image to ...
0
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1answer
1k views

md5pass or sha1pass on mac os

I'm looking for a hash tool on MacOS (shell), hope it works like md5pass on Ubuntu. Calculate case sensitive hash code. Calculate salted hash code. md5 is good, any other algorithm is ok. I ...
23
votes
3answers
12k views

How can zero byte files generate a hash value?

How can a zero byte text file generate a hash when hashed with sha1sum, sha256sum etc? What data are the programs hashing to generate a hash value? Ta
3
votes
1answer
4k views

Alternative to xxd that returns bytes?

I am on Mac OS X 10.8.2, running a compiled copy of xxd v1.10 (source code) as well as the copy of xxd that comes preinstalled on OS X. I am trying to generate a Base64-encoded SHA1 signature via a ...
1
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2answers
823 views

How Do I Troubleshoot Corrupt Downloads

I won't try to get this all documented in this first post, as I am sure you folks will have a ton of questions for me. I am having problems with my home LAN. For several weeks I have been having ...
5
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2answers
5k views

Installing sha1sum on git-bash (MinGW)

I've been using git-bash on Windows 7 a lot. I gather it is a wrapper of MinGW. It has md5sum but not sha1sum. I'd like to install sha1sum, but I can't figure out how. When I try mingw-get, it says "...
2
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3answers
743 views

why do we need SHA1 checksum?

In this page I saw the SHA1 checksum. I know it's a hash algorithm, but I don't know why we need it for download code. So I clicked "what's this?" but got no any more information. It's hash, so what?...
0
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1answer
1k views

Calculate SHA1 of CD-ROM on MacOS X

How do you calculate the sha1 of a CD-ROM disc under MacOS X? On Linux (RedHat) I use sha1sum /dev/cdrom. How do I do the same thing on Mac using openssl sha1?
39
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7answers
65k views

Is there a built-in method for computing an SHA-1 or MD5 hash in Windows 7? [duplicate]

Is there a built-in method for computing an SHA-1 or MD5 hash in Windows 7?