Questions tagged [file-encryption]

The process of encrypting individual files on a storage medium and permitting access to the encrypted data only after proper authentication is provided.

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At-rest encryption. Use SFTP log-in credentials to access encrypted drive or folder on an Ubuntu Linux server

I have a simple file server running on a small Ubuntu machine that facilitates file sharing and 2 way folder syncing between my and my girlfriend's 4 computers through SFTP over a private network. The ...
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What’s the best way to only allow a file to be opened with multiple people’s authorisation?

Is there software available that makes it easy for multiple authorisations to be required before a file can be opened? The simplest solution I've found online is to encrypt a file with a password, ...
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Naming encrypted files in the cloud, without leaking info about their content

I'm working on a photo sharing app that stores files in the cloud, encrypted, and lets you share those files with others. To do that, as suggested in answers to this previous question: files are ...
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Looking for high security; cloud based; file share, with access / location logging, and fine grain access control [closed]

My boss is looking for an escrow style solution to store files that are "classified", or have special/high-security access requirements. His requirement list for this solution: Cloud-Based -...
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Standard for encrypt files before transfer them over internet

I know there are some standards for transferring data securely such as HTTPS for web applications, or SPC & SFTP for secure file transfers. Encrypting files using PGP is a way to encrypt files ...
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Does Wire use encryption-at-rest?

Does Wire employ encryption of data at rest? I generally consider Signal and Wire to be the best tools today for sending information privately between two parities. Both meet the marks on crypto, open-...
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Should I chunk or not for AES-GCM file encryption

New to file encryption. Need to use AES-GCM for file encryption, can't change the alg. Heard about the max plain text size should be 64GB with same key and IV pair. Environment is python 3 with ...
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What is the best way to encrypt extremely sensitive and important data

I have a set of text data, that are of high importance and I want to encrypt them. Be it to keep it on a cloud for redundancy, or for an extra layer of security in my local machines. I understand ...
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File transfer service through server that is not P2P, encrypt files without letting the server know its contents

A file transfer tool, that works through a middle man server, as the following diagram: Client A uploads a file to the server, Client B has websocket events that a file is transferring and starts ...
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EncFS vs EFS advantages for Dropbox-seamless encryption

I am considering a solution for securing my private data in Dropbox. In spite of OneDrive, MEGA and AmazonCloud are also being considered but now I put my focus on Dropbox as the most feature-rich of ...
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Security Tools - File Encryption vs Corruption

When security tools quarantine files, why do they tend to use encryption, rather than simple file corruption? The main goal of quarantining a file is to make it impossible to run on a system. This ...
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Sharing files with others, encrypted on untrustworthy file storage (e.g. the cloud)

I want to work on a photo-sharing tool, where I can: store photos on untrustworthy disk space (like the cloud) share photo albums with friends and family update photo albums (rarely but happens) ...
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Not understanding why I should use public/private key encryption over password?

My knowledge about these topics is very elementary, please "school me" if I said something completely wrong, it would surely help me understand these things better. Now, to my issue. Now ...
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I want my customers to download the encrypted video file to a secured usb and play it directly in TV by providing unique key which i shared to them

How do I make sure that this content is not hacked by anyone ? Do I encrypt every file and store the key before my customers download their unique copy?
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Brute Forcing Password to a Truecrypt-encrypted file with Partial Knowledge

A while back, I encrypted a few files with Truecrypt, and stored the password in my head. Now I need to access it again, the password isn't working. I'm sure most of it is right, but I'm off by one or ...
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Where to store passwords needed by linux processes?

I am working with C++ processes on a linux (CentOS 8) environment. These processes should be able to access an encrypted file on the system. Where should I store the password for this encrypted file? ...
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What program can Decrypt specific a Folder/Files during Windows Boot/Loading? (Windows)

I've been looking into Encryption of my data for some time now; I've decided to move ahead with VeraCrypt for encryption all of my partitions (I have 2 disks in 1 laptop) except for the OS (C:) ...
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Is it safe to store VeraCrypt or TrueCrypt container inside RAR - could this method corrupt the file?

I need to split my container into smaller files. So plan is this: I create RAR archive and let it split into about 10 smaller archives, no compression and I also add password for extra security. Is ...
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How to securely encrypt shared data for a dynamic amount of users?

Example: Bob uploads a file to my custom file server locked with a password, which then the file server generates a link for him to share Bob wants to be able to share this data to anyone that has ...
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Does EFS protect against data theft by ransomware?

Recent ransomware events often include data theft in addition to just encrypting data. The Encrypting File System on Windows Pro/Enterprise editions encrypts individual files using a private key ...
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101 views

Is it possible to extract encryption keys from software executing on your own system?

I'm a newbie in this field so forgive me in advance if this question is stupid in anyway. Say we have a software that is executing on our system and encrypting files using a secret key that is not ...
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649 views

Encrypting Files With A Certificate

I am hunting for a solution where I can send someone encrypted files and a digital certificate that allows them to open the file. The reason for doing it this way is because: I don't want to keep ...
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113 views

Where is the PDF encryption key stored

Assuming you have the user protected PDF file. Using the password, the cryptographic key is generated and the file encrypted. Where is the key stored, is it on the RAM every time the file is opened?
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Crack Windows 10 password with Cain and Able

A few months ago I reset my Windows password but my keyboard must have had a sticky key or two, effectively changing my password to an unknown password. Out of desperation and a little research I used ...
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How to quickly find out what the threat nature of a password protected archive is without getting infected?

I have recently received an e-mail from an existing support group e-mail box with the following characteristics: written in the language used in company's HQ (different from English which is the ...
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Is it possible to read a text file inside a password-protected zip file without the password?

I have a text file (.txt) compressed in ZIP format protected by a password. I think it has only one line of text and I want to see the contents of this file. I tried fcrackzip but I think the ...
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Excel 2007 Encryption Strength

With a strong password of 10+ characters, mixed case, etc... is the encryption of an Excel 2007 document secure enough to create reasonably strong defense against a brute force attack? What ...
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Is EncFS secure for encrypting Dropbox?

I've encrypted my Dropbox folder with EncFS according to a few tutorials I found on the web, advocating this approach. But I've found the following critical statement concerning EncFS's security in ...
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Still able to recover files after running cipher.exe on windows 7

After running cipher.exe on my entire C: drive, I'm still able to recover deleted files using recuva. In fact, doing a before and after, I see no discernible difference in the files that are able to ...
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Is it possible to combine RSA and AES? [closed]

I'm working on a new project that encrypts folders on my personal computer.No sending of files are involved(networking). It is only for protection and security. Is it possible to combine RSA and AES ...
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Key derived from source files; deduplicated file storage

I'm wondering if the following system would be a secure way to store frequently duplicated files. Hash the source file, deterministically derive a key from it. The source file(s) are likely to be ...
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Decrypt AES 128 encrypted file with a key file

I have a file which is encrypted using AES 128 and I have a key file whose size is 48 bytes. How can I decrypt the file using the key file? The key file has no extension, I opened it in notepad and it ...
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Can a host access a VPS disk's encrypted directory directly while running?

I have an Ubuntu VPS running at a remote host. The disk is not encrypted but I have a specific directory that is encrypted for which I must provide a password via an SSH session (not stored anywhere ...
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How long should zip encryption password be for it take 10 years to crack?

I am using zip 3.0.0 on macOS High Sierra and Ubuntu. Here is my zip version on macOS: $ zip --version | head Copyright (c) 1990-2008 Info-ZIP - Type 'zip "-L"' for software license. This is ...
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Encryption - how to secure files - decrypting exposes them on SSD

Let's say I have an encrypted file. Now I decrypt it but since my computer only has SSD, i decrypt it on the SSD drive. Say, I make changes or I finish using the decrypted file so I encrypt it again. ...
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Why would I ever use AES-256-CBC if AES-256-GCM is more secure?

I guess the gist of my question is: Are there cases in which CBC is better than GCM? The reason I'm asking is that from reading this post by Matthew Green, and this question on cryptography stack ...
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truecrypt volume - Recover 18char known password with hashcat (characters variations)

I have an old truecrypt file that I'd like to decrypt. I know the 18 characters password I was using at the time, I'm sure of it. However I made a "variation" of it : I mapped some characters to l33t ...
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Keep encrypted files in sync on a cloud service, without having to upload an entire encrypted volume each time

Situation: User has several folders worth of GBs which they want to keep in sync on a cloud service (for example Mega or Dropbox) in an encrypted form; User does not want to sync a single encrypted ...
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Protecting personal documents in cloud

I want to keep my personal documents in cloud e.g. Dropbox. But I want some of my documents be encryted and password protected, such that: 1. even if my Dropbox gets hacked, those documents still have ...
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Is there any 'Open Enrypted File Container' Format?

Tools that create 'encrypted file containers' use open encryption standards like AES to encrypt container contents, however the container format is proprietary, I am guessing, so need the same tool to ...
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How to protect IP-sensitive data in files generated and used by users

I'm working on an offline windows application that generates and loads key results as files. However, these files provide key insights into how our product works internally. To make matters worse my ...
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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 ...
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How can one encrypt a file and be sure the original file can not be recovered on a SSD?

Let's say that I have an unencrypted file and I'm trying to encrypt it and make sure the original file can not be recovered from my disk. If I, for example, create an archive, put the file into it and ...
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How to pass both passphrase and password in GPG signed symmetric encryption?

I am new to GPG so I may be going about this all wrong. I have some files I would like to encrypt symmetrically using AES256, but I want to sign them with my GPG key. I need to automate this process ...
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What is the name of the crypto system used by ICANN's DNS recovery system?

I once heard about a type of crypto system that behaves in the following way: I have x secret keys that work together to decrypt messages encrypted with a public key d. If I get at least n of the x ...
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Is it safe to encrypt multiple files with the same strong passphrase?

I use GPG to symmetrically encrypt multiple files, and it would be more convenient if they all had the same strong passphrase. It's possible that someone could gain access to several of these files. ...
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Does GPG encryption via subkey harm file quality?

If I were to encrypt a folder with music files or movie files, or even only the files themselves separately, would that hurt the quality of the files? For example, if I encrypted a lossless audio file,...
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Preventing access to encrypted files at all

Suppose I create an encrypted container using VeraCrypt and want to upload it to Google Drive/One Drive for storage. The container is encrypted with AES-256. I know that no one can extract any meaning ...
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PDF file encrypted with my password, does that mean my password is stored in plaintext?

Every month, I receive an encrypted Portable Document Format (PDF) file with my payslip. I can open the file for reading with my password. Without providing my password, I cannot open the file at ...
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How can a pdf file have two passwords?

I receive emails from my bank with password protected PDF files, and they provide two passwords - either xxxx or yyyy. How is this possible?

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