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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3answers
63 views

Is there a better way to have secure downloads without the requirement of an account?

The Job You have the task of providing large files with sensitive data to people outside your company. Limitations and mandates Recipients of the data must be notified by email The size of the ...
0
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2answers
53 views

Would AES encryption of a small number of blocks be less secure than encrypting a large, fixed-size padded buffer?

My application encrypts a file with AES, and the data is read, encrypted and written with a buffer. It's size is defined with a BUF_SIZE value, which is constant. I will try to explain my question ...
0
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1answer
51 views

Risk of temporarily unencrypted data during transmission between systems

I have encountered a situation where sensitive data files are saved unencrypted to server file directories temporarily for 1 to 30 minutes before being sent to a destination application. The data ...
5
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2answers
107 views

Files encryption for flash drive privacy/security

Looking to encrypt files on flash drive (for backup) just in case it gets stolen or lost. Don't want to install any extra software like TrueCrypt but instead just use what's already on most computers. ...
4
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0answers
97 views

Linux Plausibly Deniable File System

Is there any way to encrypt a linux filesystem in such a way to maintain plausible deniability? E.g. "Hidden OS support," the way Truecrypt and Veracrypt work, they only support Windows OS due to low ...
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1answer
87 views

Does it increase the security if we split data to n pieces and encrypt each one with different key and different algorithm?

For example: a 10 MB file will be sliced to 10 pieces (each 1 MB) and then dispersed between network nodes. Each node will encrypt it with its own key and different algorithm (AES, TwoFish, Blowfish, ...
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1answer
50 views

Is Cryptree suitable for cloud storage?

I'm evaluating a cloud storage product. The marketing literature states it uses Cryptree. I pulled the paper and performed a quick read, but I don't see where Cryptree lends itself to confidentiality ...
0
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2answers
71 views

Determine Security Of A PDF File [closed]

How do I find the exact encryption on a PDF file? I can't seem to get a direct answer on the net. For example how do I tell if a document is PDF 1.1 - 1.3 (Acrobat 2 - 4), PDF 1.4 - 1.6 (Acrobat 5 - ...
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0answers
47 views

Hiding symmetric key inside encrypted data

My server generates an AES encrypted file which when downloaded acts as an input for an application. So, should I hardcode the symmetric key inside the application or should I randomly generate the ...
3
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1answer
91 views

On the fly encryption for unencrypted cloud services?

Today Amazon announced their Cloud Drive with unlimited storage for only 60$/yr. Microsoft did the same with Office 365 a while ago. I don't really want to entrust either service with my dearest ...
2
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1answer
49 views

JKS - Keystore protection and configuration file

It appears that Java Keystore is often used by web server using a configuration file, with the password opening the JKS written in it and also the password protecting the specific entry. How could ...
1
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1answer
55 views

Simple open-source file encryption tool

I want to securely encrypt files, with an open algorithm. So, i've constructed the simple openSSL shell command. How secure is it? function aes-enc() { openssl enc -aes-256-cbc -e -in $1 -out ...
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1answer
269 views

Brief staging area for unencrypted files

I have an integration workflow where: A server retrieves remote file via an encrypted connection. The file is unencrypted. The server runs linux (Ubuntu 14.04LTS). The file is downloaded to a ...
0
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1answer
139 views

Why my files that Encrypted with EFS in Windows 8.1 shown in Linux ubuntu?

i Encrypted my files with EFS in windows 8.1 so i logged in ubuntu and without any warning , its shown my files actually not Exactly the file but shown the path of file and the name and i can ...
1
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1answer
26 views

Purpose of Initialization Vector in File Encryption and Authentication (FEA)?

I came across this schematic of FEA implementation using RSA and AES: Suppose that PKB is Bob's public key, PKA is Alice's public key, SKB is Bob's private key, SKA is Alice's private key, Ks is the ...
0
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1answer
137 views

rainbow table for AES 256 CBC knowing IV, cipher text and plain text

I'm in a situation where I know that I have to decrypt a file encrypted using AES 256 CBC and I've the following details: I know the first 16 bytes block in plain text I know the IV (static 128 bit ...
2
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1answer
212 views

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'security in ...
1
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1answer
96 views

Can zip files be cracked if they were split into parts and only one part was available?

I am talking here about zip files that were compressed using basic protection and those using AES protection. In both cases, if only one of the many parts of the zip were available, will it be able to ...
87
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12answers
11k views

Technology that can survive a “Rubber-Hose attack”

In the documentary film Citizenfour, Edward Snowden says about documents: I'm comfortable in my technical ability to protect [documents]. I mean you could literally shoot me or torture me and ...
14
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4answers
3k views

VeraCrypt/TruCrypt - I can't understand why you'd want to create a “hidden” volume…?

I can't think of a reason as to why you'd want to create a hidden volume in VeraCrypt. It says because "you may be asked to hand the information," but why would I need to hand it over? Nobody has any ...
3
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1answer
33 views

Are there file-encryption tools that only allow access to whitelisted processes?

I am looking into VeraCrypt, a spiritual successor of TrueCrypt. This made a question pop up: As far as I understand, as long as the encrypted volume is mounted, every process can access the data. ...
3
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1answer
113 views

Security of hybrid encryption scheme

I want to use a hybrid encryption scheme for file encryption. The scheme must use PKCS#1 v1.5 – which is vulerable to padding oracle attacks – because many smartcards (e.g. the OpenPGP Card) only ...
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4answers
117 views

Which is more effective and 'secure': Compression+Encryption, or only Encryption?

This came up in an IRC discussion on freenode, and now I"m curious. The idea is that someone wants to determine whether or not encryption alone, or compression+encryption (with gpg/pgp being the ...
2
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2answers
95 views

Hashing a password, and summing it with every byte in a file. How secure?

I have a text document with all my usernames and passwords in it sitting on my desktop. I decided to spend a couple hours making that more secure. I wrote a program for the purpose. It takes a ...
1
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1answer
71 views

Secure (P2P) Client/Company File Sharing

my small web design company currently uses a cloud storage service to collaborate with our clients and I would like an easier (and more secure) way for files to be transferred-in and stored. The ...
2
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0answers
58 views

Offering a privacy scenario with PHP mcrypt library

first of all, sorry if my question is not clear, because English is not my first language. Anyway, let-me explain the concept I'm struggling to solve as the best solution. I have some guys, and they ...
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2answers
137 views

Does “Magic Numbers” weaken encryption?

I was wandering at superuser and I found this question: Compress and then encrypt, or vice-versa? Nearly all files have a Magic Number at a certain position in them. So, I wonder if I can attack (to ...
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1answer
46 views

Undelete-secure AES software and software for carrying out “full undeletion” free-partition-space zeroing/reformatting on Windows?

It is fairly well known that on Windows, when you delete a file (or folder which may contain any number of files and subfolders possibly containing other files and subfolders and so on), Windows just ...
8
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4answers
345 views

How to protect against adversaries snatching booted laptops to defeat full disk encryption?

I read an article describing how FBI agents snatched Ross Ulbricht's laptop while it was running to defeat full-disk encryption: Two plainclothes FBI agents, one male and one female, walked up ...
2
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1answer
89 views

Encrypting files securely using user supplied password

I'm currently trying to build a (sort of) secure, desktop based RTF text editor written for node-webkit using node.js. Based on some answers that I read here, such as How can I securely convert a ...
0
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2answers
138 views

Is it safe to store encrypted volumes on cloud syncing services?

A recent discussion on another website prompted a proclamation that storing (TrueCrypt, LUKS, DMG, etc) on cloud sync services like Dropbox is unsafe, since a version history is kept of each file, and ...
2
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3answers
789 views

Whats the point in having software's like Veracrypt, which end of the day needs password to Decrypt ?

There are encryption softwares like veracrypt which encrypt data and the only way to open encrypted file is via Password. But a simple compressing softwares like RAR also provide password protection. ...
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0answers
46 views

Has Stackfield been security audited and is the metadata safe?

It appears that Stackfield is one of the only functioning applications that combines end to end encryption, messaging services and file sharing. Peerio has just been launched (literally a day or two ...
4
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2answers
118 views

How to securely store application data on mobile device

How can security be enhanced to the maximum in a messaging app storing messaging history on the device (like whatsapp)? I am specifically referring to methods to minimize the risk of the data being ...
1
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1answer
82 views

Are there best practices concerning application account credentials?

I am looking for best practices concerning application account credentials. For example, suppose I got a corporate application which uses an Active Directory application user account to communicate ...
2
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2answers
122 views

Best way to securely store passwords for local use?

I am writing a Java application who needs three username/password pairs. I would like to add a "remember me" feature, implying I would have to store passwords on the user's computer. Knowing this ...
1
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2answers
111 views

Reasons to encrypt filenames on cloud backup

I use a cloud service for my off-site backup, and all my files are encrypted. But I am wondering whether to enable filename encryption or not. Are there any security advantages to be gained by ...
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1answer
59 views

Decryption of data [closed]

Apparently, for privacy I have encrypted data on my mobile. A few pics (family ones). This I did through ES File manager, was using AppLock previously but encountered a few errors for storage so I ...
0
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2answers
57 views

Transferring passwords to outside counsel

As part of a new eDiscovery effort, we send large amounts of data on encrypted hardware to third parties (outside counsel) that are not very technically proficient (so no key exchange via PGP ...
3
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1answer
81 views

Decrypting arbitrary offset of encrypted file

I want to store encrypted files on some storage backend that allows me to fetch bytes X through Y of the encrypted file. I can obviously decrypt the entire file locally and send it back to the client. ...
9
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4answers
3k views

Is Changing a File Type and Name an Effective Security Solution?

Is renaming folders & files and changing file types an effective solution for file security of a PC? I am an application programmer and have an extensive background in it. I have written a ...
4
votes
2answers
490 views

Security review: is this PHP mcrypt wrapper class safe?

Update (6 February 2015): It seems like the class in question has actually updated as a response to the answers here (through an issue, now closed, raised on github). I was looking for ...
0
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2answers
356 views

Encrypt files on FTP server

I have a practical situation here, my company is a FTP server provider for some clients. The clients are sharing their files on our FTP server and have had no problem with access management and ...
5
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1answer
178 views

What is the impact of RSA key's size on CPU load?

I use ssh connection encrypted and compressed. If I use small RSA keys or very big RSA keys, what is impact on CPU load for compression, for decompression and on bandwidth (encrypted file size) ?
4
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2answers
1k views

Security of Microsoft OneDrive

A friend asked about putting some of his data on Microsoft's OneDrive. I did some research, and what I learned seems very surprising. It appears that all the user data on MS OneDrive is store ...
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0answers
56 views

Clear EFS Cache at Set Interval

My boss wants to set up encrypted file shares using EFS on Windows Server 2012 R2 Boxes accessed by Windows 8.1 clients. I've been able to set the default DRA, issue certificates in test cases and so ...
3
votes
1answer
160 views

ecryptfs - relationship between passphrase and sig-cache.txt

I have previously used TrueCrypt for creating encrypted directories on servers. I am now trying ecryptfs due to the end of development announcement in May. I see that when I encrypt a directory and ...
2
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2answers
426 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 ...
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1answer
52 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 ...
1
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1answer
92 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 ...