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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How to know details of a particular file? [migrated]

A heic file was sent to me via email. Is it possible to know when that particular heic file is created by the original user?
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How do I import a private key from a hard copy?

I started playing with encrypting some personal files, and I exported the private key as an .asc file, but also on hard copy (plain paper) and can't understand a thing about how it says to import it ...
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Should I encrypt backup files with WinRar?

Currently we don't have a server in a small organization with a very limited budget. We do backup by syncing files between workstations with Windows 10 OS. I'd like to encrypt these files because they ...
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Step-by-step file encryption/decryption using user-supplied password

Let's say I want to build a dropbox clone. When users upload files they need to be encrypted. Later on, when the user needs to access their files, the application should be able to decrypt them using ...
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At-rest encryption. Use SFTP log-in credentials to unlock/decrypt 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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What is the reason for iOS per-file key encryption?

I know that apple provides per-file key encryption .i.e. a separate encryption key for each file exists on the apple device. The Hardware Key and the Passcode are required to generate these random ...
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Decrypting a file knowing only the password

I have encrypted a file using a program with a password and would like to decrypt it on another device just with the password. Is there any software that takes the password, runs it through all key ...
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Strongest file encryption available

I know nothing about cryptography. How does one encrypt a file in the strongest possible way, such that it can be accessed some years later? I prefer that it should be fairly resistant from brute ...
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Attacked by ransomware that has encrypted and renamed all files with a .makop extension [duplicate]

I've spent several hours searching the internet to see if anyone has cracked this encryption yet, but without any luck. I don't want to reward criminals for their activity, but I do have a few files ...
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If someone steals my unencrypted, password protected laptop, would they be able to get into my Google account?

I have a laptop with Ubuntu 20.04 operating system. I am logged into my Chrome browser using my Google account. This means, every time I open my browser, I am already logged into all the Google ...
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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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Password Vault Storing Passwords

I've been working on just a fun side project in C++ to practice encryption algorithms and I sort of ran into a bit of a roadblock of sorts. To summarize the project I have a text file of encrypted ...
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Folder level encryption on a Windows 10 Pro laptop

Most of the stuff on my laptop is benign; and the hassle of full disk encryption is not worth it. On the other hand, one or two folders I would love to encrypt and password protect. What's the best ...
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How secure is /dev/stdin in UNIX systems?

Is decrypting secrets with ccrypt and piping the result via stdin to openvpn secure? I've written the following alias to start an openvpn client more easily than before: sudo bash -c 'cd ...
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Recovery of files from a zip containing a directory (unencrypted) and 3 files (encrypred - ZipCrypto Deflate), possibe use of bkcrack?

I have a zip file, Example.zip consisting of a directory Example and three files *.dat. I can see the names of all 3 files. The dat files are encrypted (ZipCrypto Deflate). I'm interested to know if I ...
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Is it possible to adjust the header size in eCryptfs?

If I understand it correctly, eCryptfs creates a file in the "lower" directory whose content is a header, plus the encryption of the file in the "upper" directory. But when I create an empty file in ...
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What is the attack scenario against which encrypted files provide protection?

There are a couple of files / tools which provide file-level encryption. I guess PDF and ZIP are probably the most commonly known ones. I wonder what scenario they actually help with or if it just is ...
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PGP encryption passphrase

We are using Symantec PGP encryption for AIX to encrypt/decrypt files. Keys are generated with passphrase and the passphrase are set by the business users. The IT admin is responsible to perform the ...
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Using GPG or PGP, is there a way to give another user (or key) access to decrypt a file for a limited time only? [duplicate]

I want to share encrypted files with someone else however it's only for a short time only. What is the best way to do this? More background: I'd like to add more people to be able to decrypt the ...
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Add security to documents uploaded?

We're locally testing anasp.net application that will let a user upload documents. The app is similar to a jobs site like monster.com, but with sensitive data. The app works great locally, and now ...
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File encryption based on directory table

I have a proposed method to encrypt files (I don't know if it is actually applied or discussed). The way I suggest is to use a sector to sector table in a random manner, So if a specific sector of ...
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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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Is AES the recommended symmetric cipher for production level software?

I was considering developing an application level software for file encryption after stress testing many of my implementations of popular symmetric ciphers. I would love to support multiple ...

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