Tagged Questions
21
votes
2answers
1k views
Does versioning an encrypted file make it less secure?
Suppose I use KeePassX as a password manager, and I store the kdb file in Sparkleshare folder as a way for backing up and syncing with multiple devices.
The kdb file in itself would be encrypted, but ...
25
votes
8answers
2k views
Why would salt not have prevented LinkedIn passwords from getting cracked?
In this interview posted on Krebs on Security, this question was asked and answered:
BK: I’ve heard people say, you know this probably would not have
happened if LinkedIn and others had salted ...
5
votes
6answers
842 views
Prevent denial of service attacks against slow hashing functions?
I've been thinking about bcrypt recently, and what I wonder is if there's a way to deal with the inherent (D)DoS problems with slow hashing functions. Namely, if I set up bcrypt so my machine takes ...
8
votes
2answers
1k views
How big salt should be?
I will be using scrypt to store passwords in my application. As such, I'll be using SHA-256 and Salsa20 crypto primitives (with PBKDF2).
Having that in mind, how big salt should I use?
Should it be ...
5
votes
2answers
619 views
Keeping user data private in a cloud environment like Google App Engine
I am writing an open-source Java application for Google App Engine (GAE). The application will let users create content that is intended to be private. I want to provide reasonable assurances that ...
33
votes
7answers
2k views
“Real” Salt and “Fake” Salt
During a Q&A period at DEFCON this year, one member of the audience mentioned that we're using "fake salt" when concatenating a random value and a password before hashing. He defined "real salt" ...
6
votes
2answers
495 views
Is it better to hash n*x times in sha1 or n times in sha512 on the client side?
I already know I"m going to hash the user's password n times in either sha512 or n*x in sha1 before it is sent to the server. Once at the server, I'm going to use bcrypt set to use ~1/100th of a ...
3
votes
1answer
113 views
Protect file in a web site
How would you protect a password file in a web site? Is hashing the individual passwords not enough? What other steps do I need to follow?
