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Windows 7: 7zip?

21 Jul 2014   #1
Alexey2912

W7 Pro 32bit
 
 
7zip?

Hi,

When I rt click on any folder, see 2 options of it i.e 7ip and CRC SHA.......whats that.....how it can removed...or it is needed?

Thanks.


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21 Jul 2014   #2
Brink

64-bit Windows 10 Pro
 
 

Hello Alexey,

Open 7-Zip using Run as administrator, click on Tools (menu bar) and Options. Click on the 7-Zip tab, uncheck the top two items like below, and click on OK. This will remove these context menu items.

7zip?-7-zip_context_menu_options.jpg


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21 Jul 2014   #3
Alexey2912

W7 Pro 32bit
 
 

Thanks a lot Shawn you are one genius member.

Best Regards!
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16 Jul 2015   #4
esdaniel

Windows XP 32 bit
 
 

thanks , found this useful , i dont even remember why i installed 7zip if i already have winrar
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18 Aug 2015   #5
KeithAusTX

Win 7 Home Premium 64 bit
 
 
What is CRC-SHA?

Thanks, this is very helpful. I removed the menu items, but I wondered what CRC-SHA is anyway as a part of 7-Zip
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09 Sep 2015   #6
dandymcgee

Windows 10 64-bit
 
 

Quote   Quote: Originally Posted by KeithAusTX View Post
Thanks, this is very helpful. I removed the menu items, but I wondered what CRC-SHA is anyway as a part of 7-Zip
The CRC-SHA context menu has a few different sub-items which allow you to calculate the CRC checksum or SHA hash of a file.

https://en.wikipedia.org/wiki/Cyclic_redundancy_check
https://en.wikipedia.org/wiki/Secure_Hash_Algorithm

CRC is a relatively cheap error-checking code, whereas SHA is a cryptographically secure one-way hash.

Both can be used to verify the integrity of a file acquired over error-prone (CRC) or untrusted (SHA) communication channels such as the Internet.

For example, Notepad++ is a tool I have downloaded many times. The developers calculate the SHA hash of the file and post it alongside the download. This allows anyone who has a file they think is the Notepad++ installer to cryptographically *guarantee* that it's an official copy.

You can find the SHA-1 hash for the latest release of Notepad++ (as of writing) here:
https://github.com/notepad-plus-plus...ses/tag/v6.8.3

If you download that file then use 7-zip's CRC SHA -> SHA-1 menu item, 7-zip will calculate the hash of the file on-the-fly and you can manually verify that it's equal to what's posted online.
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09 Sep 2015   #7
KeithAusTX

Win 7 Home Premium 64 bit
 
 

That's helpful, thanks
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01 Jan 2016   #8
TDKMate

Win 7 Pro 64 SP1
 
 

Having the same 'issue,' I just wanted to say thanks for the fix!!
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 7zip?




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