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

learn more… | top users | synonyms

2
votes
2answers
41 views

Steps for building a good File Encryption on Android

I want to be able to build a good file encryption on android for a cloud app. The files used are mainly pdfs, pngs, docs, audio, video, etc (all sorts of files). Edit: My constrains are that it ...
1
vote
1answer
30 views

Javascript file detection

One common technique I use is xor bruteforcing on binary data. In this case, I would like a heuristic approach to determine whether or not any possible candidate plaintexts are javascript. This rules ...
0
votes
1answer
34 views

Encrypted NAS where only clients know the (decryption) key

Is there an implementation of a file-sharing network protocol where the server has no idea what data is being stored, but can serve the encrypted files to clients that will decrypt them on-the-fly (if ...
-1
votes
1answer
38 views

Permutation based file secure

I have a thought. 1. Take a file. 2. Read number of bytes. If its less than 2048, padd it till 2048 3. Read each byte. And create a single file which contains the particular byte. Give a random name ...
1
vote
1answer
21 views

Is eCryptfs vulverable when storing known file trees?

I use the standard Ubuntu eCryptfs setup to encrypt my home folder. As far as I can tell it encrypts the files and their names, but the directory hierarchy is essentially the same. Every git ...
1
vote
0answers
57 views

Is it possible to encrypt Word Docs with something other than default?

AES 128-bit advanced encryption is fairly simple to break and was wondering if there was any way to use a more secure one? And if so - any suggestions?
1
vote
0answers
48 views

NaCL: Encrypt file to multiple recipients

I am trying to understand the Networking And Cryptography Library (NaCL). Consider i have a file that i want to send to multiple recipients. PGP or S/MIME supports multiple recipients by encrypting ...
1
vote
1answer
19 views

Can I keep large encrypted files in my mailbox on mail provider server?

Is there any restriction or policy of large e-mail providers (such as GMail, Yahoo, Hotmail and similar) for keeping/storing large encrypted files by the users within their disk quota in 3rd party ...
1
vote
1answer
111 views

Is building an NFC payment app without a secure element like Apple Pay fundamentally insecure?

Suppose I work for a bank and am asked to write an NFC payment app for the iPhone 6 or Android but not use Apple Pay. To simply send the credit card details to the reader via NFC. Now assume I'm not ...
2
votes
2answers
117 views

Receiving sensitive data uploaded on a Web server, and remotely accessing it without exposing it to theft

Edit: I mostly used my university's guidelines on how to meet DPA standards and their own. I extrapolated a bit because encryption on a VM hosted by my uni that is already probably encrypted makes ...
3
votes
2answers
36 views

Preventing/Detecting forgery of logs generated in a potentially hostile environment

I have an application that runs on some host machine and generates logs. Later in the day those logs are securely transmitted to my machine. The problem is that while the logs are being generated I ...
1
vote
3answers
125 views

Encrypting a huffman encoded file

I wrote a huffman encoding program that can compress and decompress files. The file contains a header which contains information that allows me to retrieve the huffman tree. I wanted to add a simple ...
0
votes
2answers
80 views

How to transfer securely a file between servers?

Let's say I have two Linux servers. One containing a desktop app database (running on a local network) and a webserver. I want to automatically transfer each hour a database file (with a size of a ...
-2
votes
2answers
52 views

Identifying/decrypting hashed/encrypted data [closed]

This weekend I took part in an security challenge. I had great fun doing it but i found a huge gap in my knowledge that I'm really keen to fill and hope someone here can help get me pointing in the ...
-1
votes
1answer
58 views

Can I test/determine all decryption types on an unkown filetype. I do have the password [closed]

I have a file that's nearly 200Mb. It was reportedly packed/encrypted with Kruptos 2. But it has a .~enc extension. The header of the file is pure gibberish. Running file says it's data running ...
1
vote
1answer
326 views

can I trust Boxcryptor closed source software? Encryption of files for cloud hoster

Boxcryptor https://www.boxcryptor.com is not Open Source. Can I trust this? Is it secure? No government backdoor? Because there is no alternative for OS X and iOS.
1
vote
3answers
76 views

Completely Protected Virtual Folder

I am a Python / C developer currently working on a extremely important piece of software. The details of the code will not be mentioned, and the only place the code appears is on my own hard drive, in ...
0
votes
0answers
62 views

Where to save digital content and prevent sharing?

I've been inspired by the answer to the question here: Location to store an encryption key It gave me a lot to think about. My friend and I are building a website and we've encountered a problem in ...
0
votes
1answer
92 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?
1
vote
3answers
239 views

Is storing the private key and public keys in same directory on server recommended, like OwnCloud does?

Is this recommended or a good/normal practice? I think not. Because I saw that OwnCloud stores all encryption keys in one directory on the server. One directory contains the private key(s) and one all ...
2
votes
3answers
119 views

Securing data on a server

I have a server which has 'loose' physical security (somewhat easy for the entire server to get stolen). For the sake of the question, let's assume that anyone can access the server physically, what ...
3
votes
3answers
396 views

AES encryption do I need to use a Mode?

I am currently working on a file encryption program using Java Cryptography Architecture. My plan is to have a number of encrypted files where each file has a different AES key. To keep track of the ...
2
votes
3answers
234 views

I want to roll my personal cloud hosted Password Manager using pass. How secure/insecure would this be?

I've come to the conclusion that I need to up my security. I currently have a dozen memorized passwords I use for every device and website. I'm against Keypass/Lastpass due to having to trust they ...
1
vote
2answers
50 views

What is the security benefit of Per-File Encryption key architecture?

Are there any security benefits to having a different key(it is encrypted by a master key and that encrypted key is included in the metadata for the file) used to encrypt each file versus just one key ...
2
votes
1answer
229 views

Field-level encryption vs disk encryption for PCI compliance

We are in the process of setting up a PCI compliant server (with Firehost's help). We are using MongoDB as our primary database. I am having some concerns about the encryption, though. Are there any ...
0
votes
2answers
156 views

Encrypting files in .NET?

I am in a situation where I would like to encrypt audio and text files for an application I am working on. I did some looking around and from what I have seen the Rijndal encryption algorithm would ...
1
vote
1answer
541 views

Why is GPG file encryption so much slower than other AES implementations?

Correct me if I'm wrong: When encrypting a file, GPG creates a one-off AES encryption key and encrypts that key using RSA. This is supposedly to take advantage of AES's superior performance when ...
1
vote
0answers
498 views

Brute-Force/Dictionary attack against encypted file using PBKDF2 key derivation

I have been following this very useful post by Thomas. My use case is slightly different. I am developing a mobile application which requires some sensitive data to be stored on the device in a SQLite ...
2
votes
1answer
125 views

Is it possible to use SSH agent for generic data encryption? [closed]

Is it possible to use running SSH agent to decrypt some data (supplied as a string or read from file)?
2
votes
1answer
43 views

Method/program for editing secure files

I'm not entirely sure if this is on-topic for Security.SE, but it doesn't seem entirely off-topic either, so I'll try. :) I keep a couple of (GPG-)encrypted files with more-or-less sensitive ...
1
vote
1answer
67 views

Cryptographic patterns a security risk?

I am writing an application that serialises objects and then saves the resultant XML in an encrypted file. I am using an Initialisation Vector and a Salt both saved in the file for decryption so two ...
1
vote
2answers
145 views

How could police identify digital contraband and charge someone if it's encrypted with keys?

For example, say I am transferring heavily-encrypted DVD/Blu-ray movies/game copies over the internet. However, I am using double or (+) encryption with keys required to decrypt the file using an ...
0
votes
1answer
79 views

File encryption with external key

I want to encrypt a few files on my computer (not FDE). To do this, I'd like to use something that requires having some external usb thing with the key on it plugged into the computer. Price is not ...
1
vote
2answers
132 views

File encryption for a storage API

I'm implementing a Dropbox-like API, and one of my requirements is to have the files stored encrypted on the server. It is not required that the files are made unreadable by the server, only that they ...
3
votes
1answer
195 views

File Vault 1 password from memory dump

I have a osx 10.9 machine with a File Vault1 encrypted user partition. I would like to remove the encryption, but I don't remember the "master key" which is the only way to remove encryption ...
0
votes
3answers
60 views

Security checks on file transfer [closed]

What are the security checks that I can make on a PDF file being transferred between server and the client?
1
vote
3answers
493 views

How does encryption/decryption work when one generate random key?

I am new to this and want to ask a basic question. Suppose I used my password (say "ABC123") to generate a key using the PBKDF2 algorithm (or any such algorithm). For encrypting a file I'll input my ...
1
vote
1answer
3k views

Forgot password to 7-Zip archive

I think I already know the answer to this question, but I thought I'd ask the experts anyway. A few months back, I created a password-protected 7-Zip archive which housed the source code of a simple ...
1
vote
1answer
257 views

Retrieve RAR Password through Extracted File

So I was wondering about something, but for the simplicity, consider this example: You have a file with n encrypted files in it, of which one is called 'Note.txt' You also happen to have another ...
2
votes
2answers
2k views

How secure is EncFS compared to TrueCrypt?

If I choose the paranoia option for EncFS and for TrueCrypt I create containers using the encryption algorithm AES-Twofish-Serpent and the Hash Algorithm Whirlpool. Are both methods equally secure, ...
2
votes
2answers
180 views

Appropriate way to encrypt passwords/financial info?

I am in the process of creating a file/files containing all of my logins/password info for various accounts. In the event of my untimely demise this file would be sent to the appropriate party(s). ...
3
votes
3answers
695 views

What does Windows's built-in encryption do, if I can seemingly always read my encrypted files?

I'm playing around with certificates and encryption on a Windows system, but either it isn't working or I don't know how it should works. When I encrypt a file its name changes to green. But then, I ...
0
votes
2answers
71 views

Revoke decryption capability

I'm looking for a way to encrypt some data in such a way that I can later revoke a single person's ability to decrypt it. We have a store of database backups that are currently encrypted using GPG. ...
7
votes
3answers
266 views

How can I allow acces to encrypted data if only 2 out of 3 users provide a secret?

I want to encrypt data, but make sure that no single user can decrypt the data. Further, it is important not to require ALL users to be present to decrypt. This will allow for some flexibility and ...
1
vote
3answers
416 views

RatticDB for passwords is not encrypted. Is this good approach?

I am looking for a password application for storing passwords, and RatticDB have a web interface and SSH access is planned, which are exactly the features I am looking for. However, they write that ...
1
vote
1answer
98 views

How to generate Initalization Vectors correctly

I'm working on a project that splits large files into several encrypted fixed-size blocks (e.g. 4KiB). Those blocks shall be used to be stored persistently on a storage device. Blocks are encrypted ...
1
vote
2answers
585 views

What does Gazzang zNcrypt actually protect against?

In an effort to increase security of our website, I'm reading up on Gazzang zNcrypt, which claims to protect data in databases from breaches. Technically, it seems to do filesystem encryption. As far ...
1
vote
1answer
807 views

Hacked site - encrypted code

Couple days ago I gave noticed that almost all php files on my server are infected with some encrypted code and in almost every file is different. Here is the example from one of the files: ...
4
votes
2answers
991 views

What trust level should I give keys I need for encryption?

As I'm encrypting server backups, I typically install my public GPG key from a keyserver into me server's keyring: gpg --search-keys 6569758F I import the key into my keyring. I then attempt to ...
0
votes
2answers
69 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 ...