An archive file format that is used to bundle multiple files and folders together that may have been compressed.

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-1
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3answers
101 views

Gmail, Yahoo, Hotmail , and so on; How do they check the content of an attached password-protected archived file like Winrar?

How is it possible that mailing systems like Gmail, Yahoo, and Hotmail are able to check the content of an attached password-protected archived file like WINRAR, if the password cannot be guessed, ...
-1
votes
1answer
110 views

Is there a benefit to encrypting a file multiple times? [duplicate]

If I had to store a text file with some confidential information on the cloud, would encrypting the file multiple times (say, 3) with different passwords using WinRAR (AES with a 256 bit key) provide ...
2
votes
1answer
169 views

PDF.zip file password forgotten and need to reset [duplicate]

I have an old PDF.zip file that is password secured. Naturally I can't remember it. Is there a way to change it or disable it?
2
votes
1answer
75 views

Would it be possible to add additional files to a password protected zip 2.0 file

So the scenario is this: I don't have the ability to determine/recover the master password for a production system that uses zip 2 archives. However, I need to be able to add new files to existing ...
0
votes
1answer
90 views

Why providing many protected zip files will increase the chance of retrieving the password

In fcrackzip man they say : the more files you provide, the better. I want to know why. What's the method it uses to retrieve the password?
0
votes
3answers
641 views

Password protected zip opened in notepad

I have two password protected zip(COmpression method: normal) file with the same content(aaa.txt(blank notepad)) and I opened the zips and this came up. First one's password is: abcd PK Rd¦D ...
0
votes
0answers
93 views

Gladman's file encryption library = AES in counter mode with HMAC-SHA1 authentication?

I would like to use Gladman's algorithm to create AES encrypted data in JavaScript. I use the Crypto-JS library, but its performance is horrible. PBKDF2 is terribly slow, so I switched to another ...
0
votes
2answers
68 views

Restricting locations for unzipping a zip file

I hope that I have found the correct place to ask my question regarding unzipping files. I would like to see if there is a way to restrict the locations available to the user to unzip a password ...
-6
votes
1answer
175 views

Reverse shell in gzip

I got a box I am trying to pop (boot and root) that has an upload form on its website for logged in users that will take a .gzip file and extract it to the users home directory on the server. I am ...
2
votes
1answer
174 views

zip file downloaded: is it enough to remove it to be secured?

I downloaded a zip file, with vb files inside. If by any chance, it contains a virus, or a source code to have access to my computer, what should I do? I removed the zip file and the folder extracted, ...
2
votes
2answers
4k views

Can I properly make password-protected 7z archives secure?

After reading the question and answers of this and this, I left with an overall impression from the last one that zips were considered not safe and insecure way of sharing data. I still think ...
33
votes
11answers
16k views

Are password-protected ZIP files secure?

Following my answer. If I can list contents of password-protected ZIP file, check the file types of each stored file and even replace it with another one, without actually knowing the password, then ...
15
votes
4answers
2k views

What are the security threats of zip file uploads and what preventive actions should be taken?

We have a Drupal application developed for sharing files. We are allowing zip files to be uploaded by logged in departmental user. We are using Drupal private file system (outside webroot). We are ...
7
votes
3answers
5k views

Can password-protected zip files be broken without brute force?

You have a zip file that you created with 7z to password-protect it with AES 128. Can a smart adversary extract the data only through brute force, or is the file vulnerable to other attacks - such as, ...