IT Security Stack Exchange
IT Security Stack Exchange

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.

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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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-less identical (perhaps some padded 0 bits at the…
warren
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What is the attack scenario against which encrypted files provide protection?

There are a couple of files / tools which provide file-level encryption. I guess PDF and ZIP are probably the most commonly known ones. I wonder what scenario they actually help with or if it just is a bad solution. For example, if I want to be sure…
Martin Thoma
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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 .docx file.
Celeritas
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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. Now the problem with password is that: it can…
Red Aura
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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 you can alternate between the two, using the same…
Nathan Long
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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 server. The data is not tied to a single computer, so…
beatgammit
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How do I secure patient data cheaply in a small doctor's office?

I am a single practitioner with 3 work stations and a server. What is the best cost effective way to secure my data and I suppose encrypt it. The gov't wants us to prevent any unsecure access to patient records. They do not tell us the lengths we…
Mark Brewer
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How secure is the 2016 XLSX Excel Encrypt with password function?

Is this able to be cracked without a brute force? With a long enough password, would I be safe storing my nuclear launch codes in an encrypted excel sheet?
Relapse
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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 files prohibit sending the data via email There could…
UnhandledExcepSean
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Does knowing how an encrypted file changed make it vulnerable?

Scenario The following bash commands create an empty file test.txt, encrypt it using a default algorithm to test1.gpg, then append the line new line to the original file and encrypt it again to test2.gpg. Each of the gpg commands prompts the user to…
Max
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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 repository contains the same hooks folder with the exact…
Martin Ueding
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What is the best solution to encrypt pagefile?

I want to encrypt my pagefile.sys. I do not need to access information from it, so I don't need the encryption key after restart. I have these four alternatives: AES-256 key in Cipher Block Chaining (CBC) mode Blowfish-448 key CBC mode …
user78838
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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 desktop). Our compliance policy states no passwords in…
SDH
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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. However to decrypt them the team need the single…
RickMeasham
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Encrypted file to Remote Storage

Suppose I wanted to send some files to a remote storage device and (reasonably) guarantee their security and I am wondering whether something like the following method would be suitable: Encrypt a file using symmetric encryption, encrypt its key…
geofrey rainey
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