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.

2
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1answer
822 views

Windows 7 EFS - connot decrypt

I have some files on my laptop that were accidentally encrypted, I think by Visual Studio. I didn't even know that was possible. Anyway, the way I discovered they were encrypted was that I changed ...
6
votes
1answer
354 views

Should an app remove or encrypt locally stored user data after a user logs out?

I’ve been poking around in the Application Support folder of a popular app, trying to extract some chat logs. (By “popular”, I mean that most people reading this will have heard of it. I’m not sure if ...
-4
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2answers
109 views

Any good products that could crypt the files stored in laptops? [closed]

Thefts of laptops have become very common at my place, and losses of sensitive information is a a major concern for my businesses. So I wonder if there is any good products out there that could crypt ...
3
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2answers
2k views

WinZip encrypted file vs password protected file

How are password protected files and WinZip encrypted files different ? For example - if i have a excel file to be sent. Option 1 - I can send it as a password protected file. Option 2 - Encrypt it ...
13
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5answers
10k views

How can I decrypt data with Java, without hard-coding the key?

I hope this is not a chicken-egg problem or reinventing the wheel but here goes. I have a Java application that needs to access a password protected file (actually during the application startup). The ...
2
votes
1answer
295 views

smart AND secure cloud document archive

I am thinking of creating a cloud-based document archive. The intention is to make it impossible for the system to read the users' files, and be more than just a storage provider. Looking at this ...
1
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2answers
827 views

Seeking lightweight encryption - shareable between Delphi & C

I want to encrypt a text file in Delphi & decrypt it, line by line, in C on an embedded system which does not have much RAM (so, only one line in RAM at a time). FOSS must be available for both ...
6
votes
1answer
306 views

Could a consumer-friendly PGP-like file encryption application theoretically be secure?

In a situation where there are desktop and mobile clients, and a central public key repository to and from which the desktop and mobile clients automatically upload and download public keys as needed, ...
1
vote
1answer
316 views

Is proper documentation on .xef files available anywhere?

WinACE encrypts files (using one of its 8 methods) into a file with the extension .xef. I'd want to see some documentation on this file format but I couldn't find anything... I'm particularly ...
3
votes
1answer
526 views

Is there a way to store user files without being able to decrypt them?

I'd want to build a secure file storage web application. Currently ordinary password authentication is used for login. After login this password is used for encryption and decryption of user files at ...
7
votes
6answers
1k views

Applying file deltas to an encrypted file

I am developing software that will be used for data backup. The server will run on Linux. Security in transportation is not an issue (HTTPS or SSH), but the data must be stored encrypted on the ...
-1
votes
1answer
185 views

About important hacks in history [closed]

I would like to know how important hacks happened, because I can figure out how they hacked a website but I can't figure out how did they hacked into NASA International Space Station source code. Or ...
2
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2answers
2k views

How to use 'key material' so that multiple people can access protected files?

I'm not sure if this is the right SE to ask this question, but it seems more I have a database of files that needs to be encrypted such that multiple people with different passwords/logins to this ...
1
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2answers
1k views

How secure is using this (p3 Python) module to encrypt a file?

I've recently been looking for a good (enough) method to encrypt files, and I came across this thing. It says that it's a Simple p3 encryption "algorithm": it's just SHA used as a stream cipher ...
12
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6answers
12k views

Good file encryption tools [closed]

Could you please help me find a good file encryption tool? The target OS is Linux, but tools for Windows are welcome, too. FOSS tools are preferred. The tool must be reliable both for the recovery of ...
6
votes
1answer
3k views

Device versus file based encryption in TrueCrypt for a flash drive?

Are there security tradeoffs to be considered in deciding between encrypting an entire flashdrive with TrueCrypt versus storing a file encrypted container? The security goal is to be immune to the ...
8
votes
7answers
4k views

Verify the password of an encrypted file without waiting for complete decryption

I am currently working on an application that encrypts files with AES 256. The problem is that I want the user to see whether the password is wrong before the file is decrypted. For example if you ...
1
vote
1answer
336 views

Should I mount my mac Truecrypt Volume elsewhere?

I've read in various places to not mount your truecrypt volume in the same place as your Dropbox or Sugarsync folder. I believe this only matter for Mac/Linux, but I need some verification. On a Mac, ...
4
votes
4answers
773 views

How to securely delete a table in MS-Access?

I have a Windows 7 computer which currently has a large working Microsoft Access 2007 database on it containing some tables with confidential data. I would like to securely delete/remove the tables ...
0
votes
1answer
678 views

How does FileVault 2 work with multiple decryption keys?

With FileVault 2, you can encrypt the hard-drive such that users on the computer can decrypt it with either of their passwords How does this work?
3
votes
1answer
6k views

What algorithm/encryption type does Gmail use for security?

In the wake of the recent database hacks, i.e. Sony, Gawker, etc.. where the hackers have access to the hashed usernames and passwords, i've been more keen in paying attention to the sites and ...
1
vote
1answer
2k views

Are there any reviews or user experiences with Secretsync?

I haven't been able to find much in the way of professional reviews for Secretsync - http://getsecretsync.com/ss/ But i'm wondering how it compares to Boxcryptor and Truecrypt. How secure is ...
0
votes
3answers
2k views

Why do some LUKS tutorials mention overwriting the partition with random data?

On a lot of tutorials on luks encryption, people say to override the partition with random data, so that data is not recoverable after encryption. I don't understand that. Will the random data be ...
4
votes
3answers
1k views

Encrypting an email server's local drives or filesystems

Planning to deploy a remote hosted mailer (Zimbra based) I need to make sure the local data on the machine is encrypted. Currently, the plan is to use the built in LUKS to encrypt /opt/zimbra and ...
4
votes
2answers
6k views

Recover EFS encrypted folder after wiping system partition

We've recently ran into trouble while reinstalling one of client's desktop computer. Disk was split into two master partitions named C: and D:. We wiped out C: and reinstalled system (Win XP SP2 ...
12
votes
4answers
1k views

Encrypting data by parts vs encrypting the whole data

Suppose I have a file with records, and I have two options to encrypt it: encrypt the file as a whole encrypt each record separately and store them together. Which way is generally preferable and ...
8
votes
3answers
2k views

time to crack file-encryption password - more than just iteration

I have often seen that takes x amount of time to crack a certain length password. But this just seems to be the amount of time it takes to iterate through all the possibilities. What about the time it ...
12
votes
5answers
973 views

Security of using passwords or even passphrases to encrypt files

Is it ever appropriate to use real-world passwords to encrypt files to be sent via unsecure means. By real world, I mean a password that is memorable and memorisable by a mere person? I am implying ...
15
votes
4answers
11k views

What's the standard way to encrypt a file with a public key in Java?

I'm writing a client app in Java that sends encrypted data back to the server. All clients have my RSA public key. Is there a standard way to encrypt a given file with it to send it back to the server?...