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
107 views
how much is secure to encrypt a password using itself (as encryption key) for storing it on a unsecure media?
I want to store a password securely on a storage (suppose in a usual unencrypted file).
I use this password as AES key to encrypt itself (using AES-ECB) & then store it on the media (the password ...
1
vote
1answer
107 views
Encrypt a single file, chunk-by-chunk, each chunk using different key (AES)
Encrypt a single file, chunk-by-chunk, each chunk using different key.
I am a security newbie (only took 2 security courses before)
But currently I am using this encryption method for my Android ...
2
votes
4answers
195 views
Tamper-proofing log files
Problem Overview
I want to securely store log files so the contents are secret, and they can't be modified without detection.
The files will be encrypted using authenticated encryption (AES in GCM ...
1
vote
1answer
72 views
Ciphers in CBC mode reveal place of change in plaintext
Theoretically, when using a symmetric block cipher in CBC mode, the current block is dependent on the previous block. Suppose one plaintext is encrypted using CBC, and then one bit of it is changed, ...
0
votes
0answers
74 views
How secure is this perl script to use an AES encryption on files? [closed]
I am not entierly sure if it is appropriate to ask such a question here, but then again, I don't know a better place. If it is the wrong place, let me know, and I will remove it.
Could someone share ...
2
votes
0answers
98 views
Single-purpose symmetric encryption scheme for single files
I'm writing a simple password manager program that will encrypt/decrypt a single file (it's size will most likely stay under a few K). This is my initial file format design:
...
0
votes
3answers
131 views
File encryption with one keypair?
I'm working on a program that uses an ECC keypair in a (password protected) PKCS12 file (.pfx) to encrypt files. I like this method because I think it will be higher security (using ECDH to negotiate ...
2
votes
1answer
204 views
XOR cipher for encrypting compiled C code
I'm exploring ways of encrypting Intel hex files we send to customers for flashing onto an embedded device. The embedded processor itself has a built-in mechanism that prevents anyone from reading the ...
1
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1answer
122 views
Decryption a chunk of file with AES
We are having a requirement to store large files (~1GB) encrypted and decrypt them when reading. We are looking to use AES-CTR or AES-GCM mode to encrypt the data. There are scenarios where we want to ...
7
votes
3answers
308 views
Is it safe to use file's hash as IV?
I'm encrypting some files using AES in CBC mode.
I'm also using file's digest (SHA-1) to check that data is decrypted correctly (so I need to store it with file).
Is it safe to use this digest as ...
6
votes
3answers
481 views
Is Porticor's “homomorphic” key encryption something that can really be done or is it just marketing hype?
Porticor has an interesting file encryption offering for encrypting and decrypting files in an MySQL database quickly.
They are an Amazon AWS (Amazon Web Service) Partner Network technology partner ...
0
votes
2answers
129 views
Does gpg's symmetric encryption keep information about the filename?
If I encrypt a file with gpg -c file.zip, and change the filename. Is there any way I can restore the filename as I used as a password. or the name encrypted to?
3
votes
1answer
414 views
Implementing AES encryption for firmware distribution system
I need to implement an AES encryption for firmware distribution system.
I have a bootloader that can decrypt various AES variants (ECB,CBC,CTR).
When I approached this I found few issues that aren't ...
0
votes
0answers
110 views
How do you ensure that a large remote file is encrypted? [closed]
On a general level, is there any way to ensure that a file has been encrypted? Specifically, is there any way to check this remotely using something like a checksum or key?
Here's a simplified ...
-1
votes
2answers
502 views
what is the best algorithm for file encryption to send over network?
Was wondering what is the best algorithm to encrypt files and send them over network (that kind of algorithm that doesn't make the file larger ? , and is fast enough to handle large files) ?
Thanks ...
7
votes
1answer
5k views
What is safer: ZipCrypto or AES-256?
Like in title: which one of these encryption methods (ZipCrypto, AES-256) is more secure and why? I am asking about it because I'd like to know which should be preferred when compressing files with ...
1
vote
0answers
98 views
Structure of encrypted office files
I try to find out the structure of encrypted office files (I'd like to implement something like a carving tool for finding certain encrypted file types). I try to understand the Office Document ...
3
votes
1answer
256 views
Is this a good way to encrypt a file?
I need to encrypt a file, distribute it over an insecure channel, and decrypt it later. Using a symmetric-key algorithm. Here's what I intend to do:
Get a password P from the user. Generate a 16-byte ...
2
votes
2answers
301 views
Capacity of Advanced Encryption Standard in terms of File Encryption
what is the capacity of AES in terms of File Encryption?
is it really good to encrypt a large files in AES? ex. I am encrypting a 8GB of File... is it still good to used AES?
is it still good to used ...
2
votes
1answer
360 views
Okay to use OpenSSL to encrypt then sign a message?
I am planning on encrypting a message then signing the message so the recipient can authenticate the source. Reading this article has me concerned that I'm doing something wrong.
My current plan is ...
0
votes
1answer
196 views
File Encryption/Decryption in ECB mode [duplicate]
Possible Duplicate:
Removing Padded Value in Decrypted Message
I tried to encrypt and decrypt a file in ECB mode using AES Algorithm but I encountered one problem during decryption, I don't ...
-1
votes
1answer
386 views
How to encrypt a File using AES Algorithm? [closed]
How to encrypt a file using private key in Java.
Adding this question, how to generate the private key for the same.
Before posting I went through some question like How to perform file encryption ...
6
votes
2answers
375 views
Hash decrypts key, key decrypts cipher… why?
I noticed recently that a couple of pieces of encryption software (TrueCrypt being one of them) don't directly use a hash of the password as the key for the block cipher. Instead, they generate a ...
1
vote
2answers
730 views
How to perform file encryption using 128-Bit AES?
I am confused, how can I encrypt a file using 128 Bit Advanced Encryption Standard?
Do I need only to encrypt the file name and it's content or is there something that I need to do to encrypt it? Is ...
-4
votes
3answers
594 views
How secure is the Vigenère cipher in file encryption if you encrypt the password first?
I created a basic file encryption method, that seems pretty secure to me (based on an answer below, it seems to be an implementation of the Vigenère cipher) , but one of my colleagues claims that it ...
19
votes
3answers
885 views
Information leakage from the ecryptfs filesystem
I'm wondering what information might be leaked from the ecryptfs filesystem. This is what Ubuntu uses if you check the box for "encrypted home directory" when using the desktop installer, so is ...
3
votes
1answer
446 views
Encrypting (CBC) identical files with same key and different iv, is it less secure?
I would like to learn more about cryptography.
Let's say you encrypt multiple files with CBC encryption using the same key, but each file has unique (and pseudo random) iv. Does this weakens the ...
2
votes
1answer
651 views
Any good file format alternative to PGP for encrypting data at rest?
I'd like to create an encrypted file that:
Can be decrypted on a variety of platforms (mainly Windows, OS X, and Linux) with knowledge of the key.
Can be decrypted with existing tools (perhaps ...
