All Questions
Tagged with file-encryption keys
7 questions
0
votes
1
answer
921
views
Why does symmetric encryption not provide authentication and integrity? Is it only this type of encryption or cryptology in general have this issue?
Studying for Cryptology and came across a presentation regarding on "Integrity vs Authenticity" where the discussion briefly mentions how Encryption "does not provide integrity or ...
- 65
2
votes
2
answers
1k
views
How much data can we encrypt using AES 256 before changing the key?
Although this question has been answered in this link (After How Much Data Encryption (AES-256) we should change key?), I am not satisfied with the answers because the Recommendation for Block Cipher ...
- 21
0
votes
2
answers
159
views
How to be able to change the password to access data encrypted with AES-GCM, without reencrypting?
Let's say you need to encrypt plaintext which is 1 TB big.
You have a password pwd. This very classical AES-GCM process is ...
- 553
5
votes
3
answers
3k
views
Reusing IV in AES for encrypting file
Everyone says that you shouldn't use the same IV and Key.
Is it safe to use the same IV and Key on only one file. EDIT: I will be using CBC or CFB encryption modes so the IV will be updated based on ...
1
vote
2
answers
667
views
How can we encrypt a file to be just readable (and not writable) after decryption?
Is it possible to encrypt a file (e.g., a text document) such that when a user decrypts it, he/she be able to just read the file and not be able to change the content of the file?
I mean, the result ...
- 67
1
vote
1
answer
64
views
Crypto lib that use files instead of passphrase [closed]
I would like to program an application to allow people to encrypt files without using a password or pass-phrase but an arbitrary long file.
I'm searching for a library that allows me to safely create ...
- 11
8
votes
2
answers
1k
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 ...
- 3,567