Linked Questions

1 vote
1 answer
2k views

KeePassXC & Yubikey HMAC-SHA-1 vs 40+ Character Password

Looking at the implementation of the Yubikey 4 HMAC-SHA1 mode for KeePassXC, I want to know: Isn't the HMAC-SHA1 challenge response less secure than a 40+ character password? From what I know, the ...
proc's user avatar
  • 113
0 votes
1 answer
496 views

PHP - Does password_hash/Argon2i effectively truncate passwords after certain length?

If I'm not wrong, by default PHP's password_hash with PASSWORD_ARGON2I outputs a 43-character alphanumeric hash among other things. While this means that simple passwords that are shorter than 43 ...
Dwarf Vader's user avatar
2 votes
0 answers
159 views

How easily could a global network of machines break cryptography? [closed]

Suppose the NSA through legal means, or a malware group through illegal means has access to enormous computational resources via a backdoor into all Microsoft Windows machines (or some significant ...
coder's user avatar
  • 141
20 votes
5 answers
10k views

Which hash-length is more secure?

If a hash algorithm has an option for selecting the output-hash-length (e.g., 128 vs. 512 bits), and all other aspects of the hash function are the same, which hash-length is probably more secure/...
rpach17's user avatar
  • 325
3 votes
3 answers
2k views

Is encryption key length limitations by governments norm?

Today my internet service provide gave me a customer agreement form to fill in. I found following line in it: Permission limit for Encryption is 40 bit key per length in RSA algorithms, If customer ...
kuldeep.kamboj's user avatar
15 votes
2 answers
25k views

Why does Google prefer ECDHE-RSA-AES128-GCM-SHA256?

I want to configure my new mail server secure as possible and wondering about the used cipher while connecting to Googles SMTP server. I'm curious why they prefer the cipher ECDHE-RSA-AES128-GCM-...
Ludwig Behm's user avatar
4 votes
1 answer
589 views

Is there a PRNG in Java with a period of at least 256 bits?

From what I can tell, Sun JRE/JDK's are limited to only providing 128-bit strong cryptography without downloading an unlimited strength jurisdiction policy files. My question is, if I install theses ...
Trevor Bernard's user avatar
93 votes
4 answers
22k views

Will quantum computers render AES obsolete?

This is a spin off from: Use multiple computers for faster brute force Here's at least one source which says that quantum computers are on the way to being able to break RSA in the not too distant ...
BuvinJ's user avatar
  • 1,003
28 votes
3 answers
7k views

Use multiple computers for faster brute force [duplicate]

I've watched Mr. Robot lately and can't stop thinking why it was so hard to decrypt files encrypted using AES encryption with a 256-bit key. Let us say the only method to find the key is through brute ...
Mero55's user avatar
  • 845
22 votes
2 answers
1k views

Does holding an AES-encrypted string and its cleartext from a database help an attacker in decrypting other parts of the database

I have a question regarding Encryption. Say an attacker stole my entire database. In that database all the data was encrypted. If the attacker took one piece of encrypted data and for some reason knew ...
user2924127's user avatar
21 votes
6 answers
4k views

Can any password hash ever be secure?

My understanding is the the main reason MD5 is insecure, is that it can be calculated too quickly, allowing too many attempts to be tried. People recommend instead using a hash that has been designed ...
Benubird's user avatar
  • 326
10 votes
2 answers
1k views

What's the chance of two PGP keys being exactly identical?

In the real world, millions of PGP keys are created every day, what is the probability (chance) of creating two identical keys? In different places, by different people?
coinalty's user avatar
  • 103
9 votes
2 answers
9k views

Do you need more than 128-bit entropy?

UUID uses 128-bit numbers. Currently it is not feasible to randomly produce two UUIDs that are the same. Does that mean 128 bits of entropy is suitable for all cryptographic operations? I would ...
dodtsair's user avatar
  • 103
10 votes
2 answers
1k views

Unseen.is encryption claims revisited with their proprietary, patented "xAES" algorithm

I had asked last year about the encryption claims by the web service called https://unseen.is. The very same service that had claims of "beyond army level encryption", "4096 bit keys" etc. This is the ...
Harry Greenwald's user avatar
20 votes
1 answer
24k views

Why is secp521r1 no longer supported in Chrome, others?

Found a few issue threads, notably for Chrome (Chromium issue #478225), and the browser does appear to have dropped support for the secp521r1 curve (can test your browser using SSLLabs). There were ...
AJAr's user avatar
  • 2,392

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