# All Questions

105 views

26 views

### Key derivation function in theory & practice

I am implementing a cryptographic protocol and I'd like to generate a set of seeds using a seed for a pseudo-random function. The reason is that I can pass on only one seed and it can be used to ...
29 views

### Using AWS KMS with AES GCM

I am implementing client-side encryption for data stored in AWS DynamoDB, and was wondering about the correct use of AWS KMS for key management in addition to using AES/GCM. I am using the master key ...
31 views

### What part of an RSA key is referred to by the number of bits? [duplicate]

When we speak about 4096- or 2048-bit RSA keys, what part of the key is this number of bits? The public key comprises both the modulus and the public exponent, and the strength of the key can also be ...
47 views

### Why is Tor alone not enough to guarantee anonymity for Bitcoin?

Why is Tor alone not enough to guarantee anonymity for Bitcoin? Why do we need the constructions like Zerocoin?
54 views

### what problem happen if we always use IV Zero in CBC Mode? [duplicate]

i have a question about CBC operating mode. what problem happen if we always use IV Zero in CBC Mode?
32 views

### MD5 Hash outputs not produced

Are there any hash outputs not produced by the MD5 hash function? I need to use it as a placeholder for an empty hash while comparing two hashes.
50 views

### Is a nonce considered 'secret' enough for HMAC?

We're implementing a mobile application which communicates with a web service, and on first install the user sends its deviceid to the web service (over TLS, unauthenticated at this point) - which ...
30 views

### Modular arithmetics in diffie-hellman

Studying the basics of Diffie-Hellman key exchange, I'm stuck at a basic operation used in the end of the key exchange (where you show that both computations actually are the same). Can someone ...