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

0
votes
2answers
1k 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 ...
7
votes
1answer
100 views

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 ...
3
votes
2answers
66 views

Does MDC integrity protection matter in symmetric encrypt/decrypt of local files?

I'm configuring scripts etc. to use GPG's symmetric mode to encrypt some files on my home desktop system. When I want to edit one of the encrypted files I decrypt it and pipe it into my editor and ...
4
votes
3answers
1k 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 ...
3
votes
0answers
90 views

Can I make a digital time capsule? [on hold]

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 ...
0
votes
3answers
92 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 ...
3
votes
1answer
19k 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 ...
3
votes
1answer
660 views

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

Is it possible to use running SSH agent to decrypt some data (supplied as a string or read from file)?
1
vote
1answer
103 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 ...
4
votes
5answers
5k 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. ...
17
votes
1answer
23k views

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 ...
2
votes
1answer
73 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 ...
1
vote
2answers
92 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 ...
0
votes
1answer
42 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. ...
2
votes
1answer
68 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 ...
0
votes
1answer
126 views

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 ...
3
votes
2answers
3k 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.
0
votes
2answers
45 views

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 ...
3
votes
1answer
105 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 ...
3
votes
1answer
84 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 ...
-1
votes
2answers
78 views

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 ...
16
votes
8answers
21k views

Does password protecting an archived file actually encrypt it?

For example if I use WinRAR to encrypt a file and put a password on the archive how secure is it? I keep a personal journal and am thinking of doing this, or is there a better way? It's just one huge ...
4
votes
2answers
70 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 ...
1
vote
0answers
32 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 ...
1
vote
1answer
30 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 ...
2
votes
1answer
115 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 ...
0
votes
1answer
58 views

Can an iOS/android app encrypt data without the user entering a password?

I found an iOS app that claims to save all user data only encrypted. But the app never asks me for a password. Is it even possible that the app encrypts the data in a useful way? I do need see what ...
2
votes
1answer
56 views

OpenPGP encrypting backup files and sending them to Usenet servers

My Internet service provider includes Usenet servers with about about 45 days of retention. I'm planning to backup my most important files on there. I have a 50Mb/s symmetrical fiber connection to ...
7
votes
3answers
500 views

Secure cleaning of deleted files

So I know how to secure delete files. But at our company, we have a laptop which had many important documents, which now have been deleted, but not in a secure way. We can't perform a full format of ...
25
votes
6answers
3k views

Do spaces in a passphrase really add any more security/entropy?

I often see passphrase suggestions written as a sentence, with spaces. In that format are they more susceptible to a dictionary attack because each word is on it's own as opposed to a large unbroken ...
1
vote
1answer
28 views

Vaudenay attack on CBC-encrypted file on disk

Assume an attacker has your CBC-encrypted file and the code that was used to generate it. Also that the file has a MAC at the end. Will the following attack work? Strip off the MAC from the end of ...
3
votes
1answer
42 views

User password as offline encryption key

I want to store a file encrypted on the user's device for offline access. Since they don't have an internet connection, they can't sign in with their username/password and receive a secret key, so my ...
3
votes
3answers
627 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
349 views

VeraCrypt: create encrypted container: Volume Format: Options: Filesystem: None?

I see VeraCrypt has an option to create an encrypted container with no filesystem. How is this possible? If there is not filesystem there, then how can I place my files or folders in the container? Is ...
2
votes
2answers
12k views

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 ...
1
vote
1answer
24 views

Encrypted config file in VCS

The problem: I have a project with a config file for development and production. I want the production config file to live in VCS to make it easy to checkout a tag and build a particular version of ...
2
votes
1answer
83 views

How safe would it be to store encrypted files on an unknown server? [closed]

This is a theoretical question, basically, if I'd store a file that is encrypted by modern standards on an unknown server, hardware, disk; Would any malicious user be able to crack it? I was ...
2
votes
1answer
82 views

Secure sharing between Windows computers

I'm working on a project to setup a secure system to share files between 5 Windows computers. The computers are part of a domain so could have multiple different users logging in (based on an AD ...
4
votes
1answer
66 views

Is the 'demo' scrypt a good choice for file encryption?

The scrypt command line utility (see http://www.tarsnap.com/scrypt.html) is actually just a demonstration of the script password hashing algorithm. However, for simple command line encryption of ...
4
votes
1answer
148 views

Is ccrypt 'AES 256' file encryption fundamentally flawed

The unix/linux utility ccrypt claims to be a more secure replacement for the old unix cryypt. However it seems to me that it has a fundamental flaw. When you encrypt a file using ccrypt it uses the ...
1
vote
1answer
38 views

Hashing Based Encryption

Let's say you take a 256 bit key and never use it to encrypt anything. You receive a message with a 16 character unique randomly generated salt pre-pended. You salt your key with the 16 character ...
1
vote
1answer
237 views

PDF file encrypted with my password, does that mean my password is stored in plaintext?

I received an encrypted Portable Document Format (PDF) file that I can decrypt with my password. Without providing my password, I cannot open the file at all. Does that mean whoever created the PDF ...
0
votes
2answers
262 views

Am I legally required to give passwords or keys for encypted data during an criminal investigation? [closed]

During an investigation where one is a suspect or one may have information about a suspect, is one required to relinquish passwords or keys to personal encrypted data to the authorities? For ...
1
vote
0answers
153 views

Does Sookasa really make Dropbox more secure? [closed]

Sookasa is a service that integrates with Dropbox and claims to make your files more secure by seamlessly encrypting them. In their article Is Dropbox secure? 3 weaknesses you should know about, ...
3
votes
0answers
61 views

Securely encrypt drive, able to be decrypted independently of the OS [closed]

I need a software to encrypt drives like USB pens, disc drives, ... to securely store the data. But most of the software I've found to encrypt and decrypt drives is OS dependent. For example Windows ...
4
votes
0answers
132 views

Secure backup encryption with OpenSSL

I know, the general advice is "keep your hands off crypto stuff". And the standard way to encrypt backup data securely would be using GnuPG. However, for a rather academic exercise, I would like to ...
8
votes
4answers
6k views

How secure are the password files used by Password Safe and Password Gorilla?

Password Safe and Password Gorilla are both programs to manage passwords. Both store a list of user passwords in a file, which is encrypted using a master password. They use the same file format, so ...
44
votes
3answers
7k views

What security scheme is used by PDF password encryption, and why is it so weak?

Many PDFs are distributed as encrypted PDFs to lock out some of their functionality (eg printing, writing, copying). However, PDF cracking software is available online, which usually cracks the PDF ...
6
votes
2answers
199 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. ...
-1
votes
1answer
82 views

File encryption that supports random read access? [duplicate]

I'm looking for a file encryption algorithm (or library) that supports efficient random access to the cleartext. That is, given an encrypted file, I need to be able to repeatedly read arbitrary ...