# Category Archives: security

## AES-128 Block Cipher

Introduction In January 1997, the National Institute of Standards and Technology (NIST) initiated a process to replace the Data Encryption Standard (DES) published in 1977. A draft criteria to evaluate potential algorithms was published, and members of the public were … Continue reading

## XTEA Block Cipher

Introduction TEA Extensions (XTEA) is a 64-bit block cipher with support for 128-bit keys. It was published in 1998 as a response to weaknesses found in the Tiny Encryption Algorithm (TEA) which was discussed previously in this post. XTEA compared … Continue reading

## BlaBla Stream Cipher

Introduction BlaBla is a stream cipher intended for 64-bit CPUs, which was published by the cryptographer Jean-Philippe Aumasson on his Github in April 2017. BlaBla uses the same permutation function as the cryptographic hash algorithm BLAKE2b, which is derived from … Continue reading

## HIGHT Block Cipher

Introduction HIGHT which stands for HIGh security and light weigHT is a block cipher first proposed at the 2006 Cryptographic Hardware and Embedded Systems (CHES) conference held in Japan. HIGHT attracted a lot of attention upon its release because it … Continue reading

## RoadRunneR Block Cipher

Introduction RoadRunneR is a compact, fast Bitslice Block cipher designed specifically for Low Cost 8-bit CPUs. Details of the cipher were published here in 2015, and proposed by Adnan Baysal and Suhap Sahin at the Lightweight Cryptography for Security and … Continue reading

## Ascon Permutation Function

Introduction Ascon is an Authenticated Encryption Associated Data (AEAD) algorithm submitted to The Competition for Authenticated Encryption: Security, Applicability, and Robustness (CAESAR) It was designed by Christoph Dobraunig, Maria Eichlseder, Florian Mendel and Martin Schläffer Some of the authors mentioned … Continue reading

## Gimli: a cross-platform permutation function

Introduction Gimli, named after the Lord Of The Rings character, is a 384-bit permutation function, designed specifically to be lightweight, high performance, and secure across multiple architectures. It was designed by Daniel J. Bernstein, Stefan Kölbl, Stefan Lucks, Pedro Maat … Continue reading

## PRESENT Block Cipher

Introduction PRESENT is a 64-bit block cipher published in 2007 which provides support for key lengths of 80 and 128-bits. It was designed specifically for hardware implementation and uses a Substitution Permutation Network (SPN) structure which is similar to AES … Continue reading

## SM3 Cryptographic Hash Algorithm (Chinese Standard)

Introduction In December of 2007, the Chinese National Cryptographic Administration Bureau released the specification of a Trusted Cryptography Module, detailing a cryptoprocessor to be used within the Trusted Computing framework in China. The module specifies a set of cryptographic algorithms … Continue reading

## Chaskey-LTS Block Cipher

Introduction The Chaskey cipher is a 128-bit block, 128-bit key symmetric encryption algorithm which is the underlying function used for the Chaskey Message Authentication Code (MAC). It’s based on an Even-Mansour construction which makes it very simple to implement and … Continue reading