Linked Questions

60 votes
6 answers
56k views

Why is AES resistant to known-plaintext attacks?

At least it's my understanding that AES isn't affected by known-plaintext. Is it immune to such an attack, or just resistant? Does this vary for chosen-plaintext?
Jeff Ferland's user avatar
42 votes
12 answers
14k views

Differences between industrial and military cryptography

Industrial and military cryptography should follow the same basic rules, but what does make them different is: Higher key length, protocols unknown to the civilian world, and perhaps unique methods ...
R1w's user avatar
  • 1,952
30 votes
3 answers
5k views

Dropbox Password security

Dropbox have recently published How Dropbox securely stores your passwords Is this really more secure than using bcrypt with a complexity of 11 or 12 ? The password "chain" is secure as its weakest ...
exussum's user avatar
  • 403
22 votes
4 answers
82k views

How long would it take to brute force an AES-128 key?

How long would it take to crack a AES-128 key using the most advanced technology currently available? The hardware can be anything, be it a high-performance CPU, GPU or even FPGA?
Joy's user avatar
  • 321
20 votes
2 answers
34k views

Does SHA-1024 hash exist?

Does SHA-1024 cryptographic hash function exist similarly to SHA-512? If not, what's the reason for that? Links: SHA-2 at Wikipedia SHA-3 at Wikipedia
kenorb's user avatar
  • 647
19 votes
4 answers
35k views

Is password-based AES encryption secure at all?

For a few years I have put all my passwords in a text file and encrypted that file with a password using a software solution (Axcrypt) which uses AES-128. The password is not really strong, but I ...
Pouria's user avatar
  • 313
17 votes
4 answers
4k views

How is the quality of a password calculated and what does it mean?

While using Keepass and using it to generate random passwords, I always have noticed the "quality" section but truthfully have never known what it actually means. So my questions are; How much ...
Shackrock's user avatar
  • 273
17 votes
2 answers
69k views

Twofish vs. Serpent vs. AES (or a combo)

I've seen some posts and info online, but they are from 2009, 2010, 2011 or 2012, which is 3-6 years ago, which is a very long time. So I'm looking for an up-to-date answer about which of these is the ...
Jack's user avatar
  • 273
15 votes
1 answer
7k views

Calculate all possible keys for AES 128 encryption to exploit hardware encryption

Some background: I am using the MicroChip ATAES132a for hardware encryption/decryption. The ATAES132a is very configurable and can be misconfigured in such a way that the encryption/decryption will be ...
PhillyNJ's user avatar
  • 264
12 votes
5 answers
7k views

What is the most secure ECC Curve?

I have for a while used Koblitz curve (sect571k1), in ECDH and ECDSA. But I have started wonder if it is the most secure. I prefer security over efficiency. So the curve doesn't have to be the most ...
BufferOverflow's user avatar
11 votes
5 answers
4k views

Suppose I capture encrypted data that I want to decrypt. Could I use a server farm to decrypt?

For argument's sake, let's say that I'm a bad actor who produces malware. I've infected around 10,000 computers and smartphones with my malware, which runs in the background and can be used to make ...
NegativeFriction's user avatar
10 votes
3 answers
2k views

1 Billion Bit Encryption?

So, browsing through YouTube, I stumbled on this video interview of John Draper (Captain Crunch), one of the first "hackers". He talks for about 3 minutes (until 27:48) about his home rolled ...
Tanner's user avatar
  • 111
8 votes
1 answer
58k views

Is SHA-256 safe and difficult to crack? [duplicate]

I am trying to crack a SHA-256 hash but I am not sure how to approach this in an efficient way. The following is known of the original non-hashed content: 64 characters long only consists 0-9 and a-z ...
Matthew Kaufmann's user avatar
7 votes
1 answer
5k views

Why are NIST curves still used?

I'm relatively new to the world of crypto (But as far as the math goes, I am familiar with the inner workings. I used to rarely use it for privacy, but now I use it for many things). Anyway, I was ...
miraunpajaro's user avatar
7 votes
2 answers
2k views

What's the point and use of 512-bit-style elliptic curves?

There is a plethora of elliptic curves that are close to the 256-bit security level (i.e., fields and groups of approximately 512 bits). Examples are Curve448, P-521, Brainpool-P512. The standard ...
Ruben De Smet's user avatar

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