Mar 212017

One of the most important properties of a cryptographic hash function is that of “Strong collision-resistance“, that is, it should be “computationally infeasible” to find distinct inputs x, x’ such that hash(x) = hash(x’).

For the SHA-1 hash function, which generates a 160 bit hash, to have strong collision resistance, only ... read more

Sep 202016

Snow3G is one of the two algorithms (the other being AES) algorithms used in LTE (4G) mobile network. The specifications for LTE come from the standards body called 3GPP and include the specification and reference implementation in C for the Snow 3G algorithm. There is an algorithm for confidentiality (encryption/decryption), and an algorithm for ... read more

Oct 132015

Elliptic Curve Cryptography: computing shared key

If Alice and Bob want to exchange encrypted messages, they need to first agree on a Key. This shared key (also known as symmetric key) will be used to by both parties to encrypt messages. There are many ways of arriving at the shared key (including the old fashioned ... read more