![]() It was chosen among several other encryption algorithms as the new standard by the NIST and has been in use since 2001. Unlike Twofish, the AES algorithm uses a substitution-permutation network for encryption instead of a Feistel network. The AES encryption algorithm formerly known as Rijndael is a symmetric key block cipher. The result of the post-whitening is the ciphertext. The Twofish algorithm repeats this process sixteen times after which the result goes through post-whitening, a similar operation to pre-whitening. This makes up the result of the first round. The Twofish algorithm joins the result of the XOR operation with the initial set of 32-bit words passed into the F function. The 32-bit words are then XORed with the remaining 32-bit words from the pre-whitening. The results of the PHT are each added to two sub-keys each of which outputs 32-bit words. The two 32-bit words are then passed through a Pseudo-Hadamard Transform (PHT). ![]() The result of each g function is then combined with an MDS (Maximum Distance Separable) matrix to give a 32-bit word. Each 32-bit word splits into four bytes and goes into the S-boxes which accept and output 8 bits. The f and g functions are black boxes used by the algorithm to scramble the two 32-bit words fed into it. The f function contains two g functions each of which contains four key-dependent S-boxes. The first two 32-bit words are then sent to an f function. The result of the XOR which is also a 128-bit block is passed to the encryption algorithm and split into four parts. The Twofish algorithm is quite interesting as you will see.īefore the actual encryption takes place, data goes through a process called pre-whitening, where a 128-bit block of the data is divided into four parts and then XORed with sub-keys generated by a key schedule in the algorithm. This is the use of pre-computed key-dependent S-boxes. ![]() Twofish has certain key properties of the BlowFish algorithm, one of which makes the Twofish algorithm unique from other encryption algorithms. It makes use of a Feistel network which DES and 3DES also apply. Twofish shares some similarities with some other encryption algorithms. ![]() Though the NIST enforces the use of only 128, 192, and 256-bit keys for encryption. It has a block size of 128 bits with key sizes of up to 256 bits. But before going ahead with the comparison, it’s vital to understand how they work. In this article, you’ll get a thorough comparison of these two encryption algorithms. In 2001, they chose the encryption algorithm called Rijndael, now referred to as AES ( Advanced Encryption Standard) to be the standard.Īmong the finalists for the competition was an encryption algorithm called Twofish, which was also good. Over the next couple of years, they chose the best algorithm. It organized a competition and received several entries. While 3DES was still being used around the world, there were already plans by the National Institute of Standards and Technology to deprecate it due to the discovery of vulnerabilities in its approach.Ībout two decades since introducing the 3DES, the NIST began a search for a better encryption algorithm. It encrypts the data with one key, decrypts with another, then encrypts the data again with another key. The 3DES made use of the Data Encryption Standard encryption but with some differences. This problem led to introducing the Triple-DES or 3DES. But as hardware became more powerful, that standard became vulnerable and insecure. This encryption standard was secure enough. In 1977, the United States government established an encryption standard called the Data Encryption Standard (DES). Let’s have look at how the comparison Twofish vs AES goes.Įncryption has been in use long before the internet, restricting access to sensitive and confidential information. One way to achieve this is through encryption. Some of this data is public, but most are confidential and needs protection, so it doesn’t get into the hands of hackers. ![]() All these activities involve a lot of data transfer from one point to another. We buy stuff, do bank transactions, and chat with our friends through the web. We live in an age where almost everything we do is online. ![]()
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