At the current time, is SHA256 the de facto standard for strong encrypted hashes? From what I am seeing of more sites utilizing it I would suppose the answer to this is yes but would like to hear what the community here has to say about this and why it is happening.

I've been trying to find out the correct way to encrypt a byte[16] variable using DES algorithm. Here's the scenario: The data should be encrypted in 8-byte parts. the key for encryption is: byte[] {11, 11, 11, 11, 11, 11, 11, 11} First 8 bytes is encrypted using Instance Vector = new byte[8]...

I should implement an encryption method in C# with some information about the cryptography algorithm. Here's what I have: I should use DES. The key is byte[] {11, 11, 11, 11, 11, 11, 11, 11} The data (16 bytes) should be encrypted in 8-byte parts. First 8 bytes is encrypted using Instance Ve...

Is there any scheme, ideally one widely used or at least widely available, where you can treat both the signing and verifying keys as secret? Basically, the functionality I'm looking for is this: You derive two keys, $S$ and $V$. $S$ cannot be derived from $V$, nor can $V$ be derived from $S$....

Is it possible to deduce the original function that used to generate those pre-paid cards number that are used for charging your mobile phone credits? For Example, If I've collected about 1000 of those cards, how do