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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693 views

Sweet 32: Which applications we consider vulnerable?

Backgound There is a lot of hype about the Sweet 32 paper in the recent days. The paper shows that 64bit block size symmetric cyphers are too vulnerable today, it performs a birthday attack on ...
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1answer
492 views

How to encrypt a file? [closed]

I created my own encrypt / decrypt script and I can encrypt any kind of strings. I just need to know how can I use my script to encrypt a file like an image or a text file? My script is working in ...
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2answers
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How to securely encrypt and decrypt files between a server and a client PC [closed]

I am building an application where users send files with a password for encryption to a server via ssl. They can then share the encrypt files with people I will then build a desktop application in C+...
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Various questions about file compression and encryption regarding hacking (zip, rar, 7z) [closed]

So I'm curious about a few aspects of compressed files (Zip, rar, 7z, etc), and how they impact hack-ability. There is enough on this subject that I'm not clear about (since this isn't a career of ...
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1answer
6k views

PGP encryption using .ASC file. [closed]

I need to send a important file(i.e.: pdf) to someone. They gave me a .ASC file for encrypting the file i will send. What could be the procedure for encrypting the pdf using that .ASC file? Please ...
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1answer
549 views

Are AES-CBC encrypted files subject to padding oracle attacks?

Almost all info related to padding oracle attacks on AES are described in the context of client/server scenarios but does it apply to local encrypted files as well? For example, a file P is ...
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3answers
987 views

How to eliminate data leaks when accessing encrypted data?

Goal: Encrypt/secure and access sensitive files (PDFs, etc.) locally. Method 1: Store files in a VeraCrypt file-hosted volume (container). Concern: Data Leaks. When mounting and reading files from a ...
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4answers
618 views

Which cryptographic algorithm should be used on client side to encrypt file before uploading to a cloud which is only for storing purpose?

I want to develop a website which will take the files from my computer encrypt it with my key and upload it on cloud which is only for storage purpose and decrypt it after downloading it on my ...
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6answers
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Is there any reason I shouldn't make a GPG-encrypted file publicly-accessible?

I'm working on a project where we need to keep a few specific files easily accessible, but encrypted. My idea for accomplishing this is to have the files available in the project's public website, ...
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2answers
162 views

Is there such a thing as application-specific encryption?

I am looking for a way to encrypt certain files (.jpg, .pdf, standard file extensions) such that they can only be opened by a certain application (assuming this application will have the relevant file ...
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2answers
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How to crack encrypted disk (crypto-LUKS) in an efficient way?

I had a disk encrypted by crypto-LUKS but forgotten password. I read a question posted here. LUKS HDD Encryption crack But before that I want to know if there's some free software I can use to ...
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2answers
378 views

Which of AES modes are safer and faster for transferring data over the network?

I have using Crypto++ in Qt and use of AES Algorithm for encrypting files. I know about AES modes and their applications. I have use of StreamTransformation method for encrypting files in CBC and EAX ...
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2answers
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How does SFTP work? Please help someone [closed]

We run a system that automatically sends a swift message at the end of a process. But this messages are sent using FTP. We feel the FTP process is too prone to MITMA and wish to change the sending ...
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1answer
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How to protect EXIF data against editing/deleting in jpeg file?

Is there any option to protect EXIF data against editing or provide password protection? I came accross the idea of creating executable file from image file, so that someone can view image the way is ...
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1answer
814 views

How to use a different key and IV for encrypting a file with AES in C++?

I know how AES encryption works, and different modes (for example EAX, CBC, CCM, ...), and also about CipherBlock and StreamTransformationFilter methods and their implementation in C++. I am using ...
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2answers
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Suggestion on asymmetric (hybrid encryption) encryption for big file

We will be using following commands to encrypt to firmware file at server and that will be decrypted on the embedded board using decryption command mentioned below, Following command will be used to ...
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Limit possible harm of ransomware on a fileserver

First to say: I know I need a backup and I have one of course but my question isn't about the safety of the data but about how to reduce the possible time that is needed to restore data. I'm already ...
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2answers
246 views

What are the recommended steps involved in creating an encrypted file format? [closed]

I'm developing a pretty standard program which lets users save their work in a custom file format and reopen it later. Now I'd like to add the capability to encrypt the file using a user-defined ...
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3answers
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Do file-encrypting software give a false sense of security? [closed]

I sometimes use a VeraCrypt volume to store personal data (mostly backups from another computer) on a Windows computer I don't own. But I learned over the years that modern OSes store users' data in ...
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1answer
656 views

Sensitive files in the Cloud: Automated mounted TrueCrypt volume

My current setup currently I'm using Boxcryptor Classic 1.x (still compatible to EncFS) to mirror some files with SyncBack Pro into the virtual Boxcryptor-Harddisk. Those get then encrypted by BC ...
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1answer
592 views

Is there a ransomware variant that checks for file's magic numbers to encrypt?

Is there a known ransomware-variant (Cryptolocker, Cryptowall etc.) that before encrypting the files checks for their magic numbers? Lets say that there's a Word file, that had its file extension ...
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6answers
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How to prevent illegal file transfer or copying of video files from a PC? [closed]

I have developed a windows desktop application using VB.NET. My applications main purpose is to play videos. I have some videos which has copyrights on them, that are not suppose to be distributed or ...
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1answer
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Is there readily available encryption algorithms for current computers, that is safe from quantum computers?

Is there readily available encryption algorithms for current computers, that is safe from quantum computers? I know a bunch of currently popular encryption algorithms that are safe from current ...
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1answer
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How is encryption different for Windows yet they are identical?

I right clicked on C:\Users\USERNAME and did advanced -> enable encryption. On one laptop it turned green. The other it shows an icon on the files with a lock. What is the difference between these? ...
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2answers
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How difficult is it to brute-force Windows EFS encryption?

With EFS I have C:\$USER\ encrypted so all files owned and used by said user are encrypted. If this laptop is stolen, am I correct that they could pull the microsoft user password hashes, crack them,...
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1answer
338 views

Getting file from Amazon s3 encrypted based on user

I am storing my files on Amazon S3. My problem is that whenever a user asks for a file I want to generate an encryption key (user specific key) and encrypt the file and send it to him. So basically I ...
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1answer
250 views

Recommendation Key Management and Storage in Cloud Storage

I am currently researching about key management in the cloud storage and looking for alternative for it. The current system stores encryption key for each file in the server and each key is encrypted ...
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3answers
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Would it be plausible to write your own anti-crypto-ransomware tool? [closed]

Question After reading about how basic ransomware targets and encrypts your files. I was wondering if it would be plausible to write your own script to try and detect such activities? Initial ...
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when/how does an encrypted volume .dmg change to reflect the file system it stores

I'm trying to verify that storing a .dmg file stays encrypted while only the mounted file system is unencrypted (see here). My thought was to create a .dmg containing a text file, make a copy of the ....
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1answer
473 views

Decryping a RAR file with same password

I came across a problem very similar recently and wondered if anyone knew how to solve this. So say for example I have an RAR archive called archiveA.rar and a password to protect it the password is ...
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3answers
15k views

Why would an encrypted file be ~35% larger than an unencrypted one?

According to the ownCloud documentation, if you enable encryption, file sizes can be ~35% larger than their unencrypted forms. From my understanding of encryption, the file sizes should be more-or-...
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1answer
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John McAfee's Explanation of iOS Hack

I'm referring to this YouTube video, and further comment from John: I hope everyone knows that the Apple explanation was VASTLY dumbed down for the press. I know the A7 system chip well, ...
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1answer
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How secure is my software for file encryption with AES-256?

I'm working on a project to build software for file encryption with AES in Java, it's operation is quite simple, but I was wondering if it is really safe. The program prompts the user for a ...
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Encrypted password inside compressed archive

File compression utilities like Winrar or ZIP or 7zip encrypt the password and store it inside the archive. How safe is that? I mean you are giving away the archive with the password inside,it's not ...
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0answers
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Can I make a digital time capsule? [closed]

Say I wanted to make a super awesome time capsule of some digital information. How would I encrypt it so that no one would be able to open it until a specified date? (E.g. 100 years from now.) At ...
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2answers
263 views

How to deal with encryption virus?

We are just struck by encryption virus. I don't know which is it, but it encrypted files with extention which finishes with doctor@freelinuxmail.org. How to find out which PC is infected? We did ...
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1answer
259 views

How does encryption strength make a difference to an attacker

Take for example I have my social security and other personal information stored as a string that I am trying to encrypt on my local drive. My first method of encrypting the string is to use a ...
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1answer
225 views

Are their any consequences to encrypting a one bit message? Does size/variability matter?

I'm trying to understand encryption a little more and couldn't get past this one nagging question. Let's just say I happen to want to send a one bit message to someone over an encrypted channel. I do ...
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2answers
1k views

Keeping user files secure while allowing a web-application to use the files

Short background I am currently in the process of designing a web-application where the user uploads some files to the server and then asks the server to do some calculations based on these files (...
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1answer
713 views

Secure data by encrypting and rewriting on same file

I'm working on a project to Encrypt files using AES encryption with a key generated from SHA-256 from a keyword. My idea to claim this was to first : read all bytes from a file second : encrypt ...
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1answer
141 views

How to encrypt data on flash drive to decrypt on another system? [closed]

I have a Mac OS X and a flash drive and I would like to store some files as a backup to carry with me in case I completely lose access to my computer (e.g. theft). I would like to encrypt these files. ...
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1answer
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Encrypting individual files on OS X

I am about to go paperless, and I want to protect the documents that I scan. The use case is that I'll be scanning paper documents, encrypting each file, and storing them locally and on various backup ...
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1answer
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Encrypting the System Infrastructure

The requirements are to Encrypt the data in our servers 'at rest' and the 'database' - in short the whole infrastructure. Threat Model - to protect a possible data-breach by an adversary (or from ...
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Is there a full-disk-encryption OR file-encryption solution where a trojan can NOT extract the secret key (e.g. from RAM)?

Is there a full-disk-encryption OR single-file-encryption solution like an operating system or a combination of devices or services ... that make sure that the master-decryption-key can NOT be ...
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Which is more secure a full disk or file encryption? [duplicate]

There are probably two ways to encrypt your computer full disk encryption which completely locks down the computer between when it is off and when it has booted but after everything loads you computer ...
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1answer
367 views

What are the problems of using OTP encryption with TRNG?

I've programmed a simple One-Time Pad "encryptor" that can merge two files into one by using bitwise XOR. The pseudo-random key files are generated by using the CryptGenRandom() function from ...
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2answers
161 views

Sending encrypted file and password by email

I know that a password for an encrypted file distributed by email should be sent out of band (i.e. not via email), and that there are better options for distributing information securely. But, let's ...
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0answers
457 views

AES keyfile size

I would like to encrypt files using a key file instead of a password. What I would do is: 1) Generate X random bits using openssl rand X > mykey 2) openssl enc -aes-256-cbc -in secretfile -out ...
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1answer
67 views

Is it a good idea to use an OpenPGP key that has no password?

I'm tarballing and compressing backup files of my system configuration, and other important stuff. The process of tarballing, compressing and encrypting happens every time rsnapshot changes something ...
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1answer
201 views

Can I use more than one encryption program to encrypt my computer files or will it cause conflicts?

I encrypted my Ubuntu Linux Operating System in the installation process using the default encryption in Ubuntu if my computer is encrypted with one program can it be encryption with another at the ...

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