Is hashing a password twice before storage any more or less secure than just hashing it once? What I’m talking about is doing this: $hashed_password = hash(hash($plaintext_password)); instead of...
License keys are the defacto-standard as an anti-piracy measure. To be honest, this strikes me as (in)Security Through Obscurity, although I really have no idea how license keys are...
I need to implement 256 bit AES encryption, but all the examples I have found online use a “KeyGenerator” to generate a 256 bit key, but I would like...
I see a lot of confusion between hashes and encryption algorithms and I would like to hear some more expert advice about: When to use hashes vs encryptions What...
Every now and then I hear the advice “Use bcrypt for storing passwords in PHP, bcrypt rules”. But what is bcrypt? PHP doesn’t offer any such functions, Wikipedia babbles...
SHA-256 is a cryptographic (one-way) hash function, so there is no direct way to decode it. The entire purpose of a cryptographic hash function is that you can’t undo...
If you try to decrypt PKCS5-padded data with the wrong key, and then unpad it (which is done by the Cipher class automatically), you most likely will get the...
Once I have a list of providers, as described in JB Nizet’s post, I still don’t have a list of algorithms. I found that each Provider functions as a...
A simple way of doing this is to use Password Based Encryption in Java. This allows you to encrypt and decrypt a text by using a password. This basically...
That my friend is an array of bytes. In JNI, [B is used to describe an array ([) of bytes (B). An array of ints is...