Questions tagged [7zip]
7-Zip is an open source file compression and archiving application. Use this tag for questions regarding this application.
22 questions
0
votes
1
answer
239
views
Does 7z or RAR5 offer better resistance to brute force attacks?
Does 7z or RAR5 offer better resistance to brute force attacks?
- 1
1
vote
2
answers
3k
views
Encrypted 7z file password not working
I'm in an interesting predicament. I have an encrypted 7z file that I made myself. The password for the file is a 60 character generated password that I saved to my password manager. I made sure to ...
- 113
1
vote
0
answers
141
views
How does the "ClaimLetter#.zip" attack work?
I wonder if this is the right place to ask about the specific functioning of viruses / worms. We all receive fishy mails all the time. And generally I never click on anything, especially not ...
- 111
2
votes
1
answer
583
views
Military-grade encryption on Blu-ray discs?
Another thread addresses the question of what can count as "military-grade encryption." In this case, I see that CyberLink Power2Go software boasts "advanced military-grade 256-bit ...
- 123
11
votes
1
answer
4k
views
Does 7-Zip really run multiple rounds of SHA-256 when key stretching?
Recently I was testing whether I could make 7-Zip archives more bruteforce-resistant. Both someone on Wikipedia and @kelalaka on this website make the following claim:
The 7z format supports ...
- 6,594
0
votes
0
answers
16
views
Application to archive a file with multiple passwords [duplicate]
Is there an application to create an archive (e.g. 7z, zip, rar, etc) that can be accessed with multiple valid passwords?
For example the password protected archive "example.7z" can be ...
- 1
3
votes
1
answer
2k
views
AES256 - 7zip Vs GPG
I noticed that 7zip provides an option to encrypt the contents of a folder using AES256 (Screenshot Below) and so does GPG using this command:
gpgtar --output <Name_Of_The_Output_File> -v --...
- 656
1
vote
1
answer
12k
views
Cracking Lost Password for encrypted 7z file with most characters known
I forgot password to 7z archive encrypted with AES 256. I am fairly certain of most characters however. I know password length is either 8 or 12 characters and if it is 12 I know the last 4 characters....
- 13
0
votes
1
answer
3k
views
7z "Copy 7zAES" algo brute force with 32 char password for when original file is available (QNAP QLocker ransomware) [duplicate]
As some in here might know, there is/was a ransomware attack going on worldwide that used 7z to encrypt all files <20MB for a ton of users world wide.
Each user has a unique 32 char password (Upper ...
- 103
0
votes
1
answer
211
views
Is checking zip content on another PC enough to prevent data leak?
Let's say I have two kind of files on my Windows desktop - first are files that can be published and shared with other people, second kind is confidential and should remain private.
To share files I ...
- 45
1
vote
1
answer
712
views
Can I consider files compressed with password safe at all?
A follow up to my 7,5 years old question. Back 10-15 years ago, when I wanted to send an executable file over Gmail from my PC, all I had to do was to change file's extension to some meaningless one ...
- 3,689
7
votes
4
answers
15k
views
Are files encrypted with 7ZIP vulnerable to password crackers?
A client says they can't accept password-protected PDFs to put in their payroll system, so I have to send them without security. I don't want to send unsecured PDFs via e-mail because e-mail is ...
- 1,947
3
votes
3
answers
871
views
Does compression level influence security of encryted 7z files?
I want to archive some GB of sensitive data. It is to be stored on an external drive that also includes non sensitive data so i don't want to encrypt the whole drive. For that purpose i want to use ...
- 33
4
votes
1
answer
4k
views
Recovered a 7z password with hashcat, but it's not the right one
I am trying to recover a 7z file, but have forgotten the password. It's completely AES-256 encrypted (i.e. not even the filenames are available).
Steps:
Generated hash file with 7z2hashcat.pl
Ran a ...
- 41
2
votes
1
answer
8k
views
Decrypting a password-protected 7z file with Delta filter fails
I have made a 7z archive using Delta filter containing a wav file and I have protected it with a password. I am running a terminal in Kali Linux. My problem is that I cannot get the password cracked ...
- 21
0
votes
0
answers
3k
views
Getting an error when running John The Ripper on 7zip file
I've never really worked with this tool, John Jumbo 1.9. I'm just curious since people say 7zip is a secure way of encrypting files, so I wanted to try it myself. Anyways, I encrypted a file with 7z, ...
- 101
1
vote
1
answer
490
views
JohnTheRipper Advanced Mask
I have problem to construct advanced mask to crack hash of 7zip file.
The password have 16 chars where are all lower, upper, decimal and !@#$%-_=+:
Main information is that any char can't duplicate ...
- 113
1
vote
2
answers
2k
views
Can a PowerShell script inside a Zip file execute automatically upon unzipping?
I have a zip file that has a Powershell script inside that I want to look at. Is it possible that the Powershell script could execute automatically just by unzipping the file? This is not something I ...
- 11
0
votes
0
answers
360
views
How to make 7-zip files more secure? [duplicate]
I came across these articles which imply (to me) that 7-Zip's AES implementation is not good:
https://twitter.com/3lbios/status/1087848040583626753
https://threadreaderapp.com/thread/...
- 123
1
vote
1
answer
2k
views
Executing vs Extracting PE32/PE32+ executable
If you have a malicious upon execution ("running" it / double clicking on it) .exe , would extracting its contents with something like 7-Zip utility mitigate its effects? Or can it still do harm?
6
votes
1
answer
8k
views
Encryption Using 7z or Zip File
I'm wondering which encrypted 7-Zip file format has better encryption: 7z with 256 AES or zip file with 256 AES? Assume that a strong password is used, then which encrypted 7zip file format has ...
- 87
17
votes
2
answers
3k
views
What is the impact of the reported weak IV in 7 Zip?
It has been reported that 7 Zip generates IVs in a weak manner.
What is the actual impact of this? I'm asking about historical Zip files that I've sent. I've no plans to use 7 Zip going forward until ...
- 34.7k