Why are primes important in cryptography?
One thing that always strikes me as a non-cryptographer: Why is it so important to use prime numbers? What makes them so special … Read more
cryptography
Difference between java.util.Random and java.security.SecureRandom
My team got handed over some server side code (in Java) that generates random tokens and I have a question regarding the same … Read more
How does password salt help against a rainbow table attack?
I’m having some trouble understanding the purpose of a salt to a password. It’s my understanding that the primary use is to hamper … Read more
How to hash some string with sha256 in Java?
How can I hash some string with sha256 in Java? 16 Answers 16
Simplest two-way encryption using PHP
What is the simplest way of doing two way encryption in common PHP installs? I need to be able to encrypt data with … Read more
How do you Encrypt and Decrypt a PHP String?
What I mean is: Original String + Salt or Key –> Encrypted String Encrypted String + Salt or Key –> Decrypted (Original String) … Read more
Is it possible to decrypt MD5 hashes?
Someone told me that he has seen software systems that: retrieve MD5 encrypted passwords from other systems; decrypt the encrypted passwords and store … Read more
Where do you store your salt strings?
I’ve always used a proper per-entry salt string when hashing passwords for database storage. For my needs, storing the salt in the DB … Read more
What data type to use for hashed password field and what length?
I’m not sure how password hashing works (will be implementing it later), but need to create database schema now. I’m thinking of limiting … Read more
Failed to install Python Cryptography package with PIP and setup.py
When I try to install the Cryptography package for Python through either pip install cryptography or by downloading the package from their site … Read more