How does the AES algorithm work?

by | Mar 31, 2022 | CompTIA, Encryption, Exclusive Articles, Featured

AES

AES or Advanced Encryption Standard is a symmetric encryption standard that is established by the US NIST (National Institute of Standards and Technology) in 2001. It is also a block cipher. It divides the input plaintext into several equal-sized blocks and then the encryption algorithm is applied to each block.

AES is also a subset of the Rijndael block cipher. Rijndael block cipher uses different keys and block sizes. Among those different block sizes and key lengths, AES uses a block size of 128 bits and key lengths of 128, 192, or 256 bits.

How does the AES encryption algorithm work? In this article, we would discuss that in detail.

This article is accessible to premium members only. To access this article, please purchase The Security Buddy Premium Membership Plan.

Pages: 1 2 3 4
Facebooktwitterredditpinterestlinkedinmail

Related posts:

AES Implementation in PythonAES Implementation in Python DES Encryption AlgorithmHow does DES encryption work? Encryption And Decryption In ECB ModeBlock Cipher Modes of Operation Exercise - 3 Constructing C Code From x86 AssemblyExercise 3: Constructing C Code From x86 Assembly AES Encryption and Decryption in PythonAES Encryption and Decryption using PyCryptodome module in Python Substitution Permutation NetworkWhat are Substitution-Permutation Networks (SPN)? Encryption and Decryption in CBC modeImplementation of Cipher Block Chaining (CBC) Feistel CipherWhat is a Feistel cipher? Constructing C Code From x86 Assembly For FunctionsHow to construct C code from x86 assembly for functions? Inverse Of A MatrixCalculate the inverse of a matrix using Python NumPy Calculate Inverse Using QR DecompositionCalculate the inverse of a matrix using QR decomposition in Python RC4 Stream CipherHow does the RC4 algorithm work? QR DecompositionPerform QR decomposition of a matrix using Python SFTP ProtocolHow does the SFTP protocol work? PKCS7 Padding And Unpadding in PythonHow to implement PKCS#7 padding and unpadding in Python? Matrix RankHow to calculate the rank of a matrix using Python?

Calculate the pseudoinverse of a matrix using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

What is the pseudoinverse of a matrix? We know that if A is a square matrix with full rank, then A-1 is said to be the inverse of A if the following condition holds: $latex AA^{-1}=A^{-1}A=I $ The pseudoinverse or the Moore-Penrose inverse of a matrix is a...
Read More

Cholesky decomposition using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

What is Cholesky decomposition? A square matrix A is said to have Cholesky decomposition if it can be written as a product of a lower triangular matrix and its conjugate transpose. $latex A=LL^{*} $ If all the entries of A are real numbers, then the conjugate...
Read More

Tensor Hadamard Product using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

In one of our previous articles, we already discussed what the Hadamard product in linear algebra is. We discussed that if A and B are two matrices of size mxn, then the Hadamard product of A and B is another mxn matrix C such that: $latex H_{i,j}=A_{i,j} \times...
Read More

Perform tensor addition and subtraction using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

We can use numpy nd-array to create a tensor in Python. We can use the following Python code to perform tensor addition and subtraction. import numpy A = numpy.random.randint(low=1, high=10, size=(3, 3, 3)) B = numpy.random.randint(low=1, high=10, size=(3, 3, 3)) C =...
Read More

How to create a tensor using Python?

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

What is a tensor? A tensor is a generalization of vectors and matrices. It is easily understood as a multidimensional array. For example, in machine learning, we can organize data in an m-way array and refer it as a data tensor. Data related to images, sounds, movies,...
Read More

How to combine NumPy arrays using horizontal stack?

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

We can use the hstack() function from the numpy module to combine two or more NumPy arrays horizontally. For example, we can use the following Python code to combine three NumPy arrays horizontally. import numpy A = numpy.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) B =...
Read More

How to combine NumPy arrays using vertical stack?

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

Let’s say we have two or more NumPy arrays. We can combine these NumPy arrays vertically using the vstack() function from the numpy module. For example, we can use the following Python code to combine three NumPy arrays vertically. import numpy A = numpy.array([[1, 2,...
Read More

Singular Value Decomposition (SVD) using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

What is Singular Value Decomposition (SVD)? Let A be an mxn rectangular matrix. Using Singular Value Decomposition (SVD), we can decompose the matrix A in the following way: $latex A_{m \times n}=U_{m \times m}S_{m \times n}V_{n \times n}^T $ Here, U is an mxm matrix....
Read More

Eigen decomposition of a square matrix using Python

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

Let A be a square matrix. Let’s say A has k eigenvalues λ1, λ2, ... λk. And the corresponding eigenvectors are X1, X2, ... Xk. $latex X_1=\begin{bmatrix} x_{11} \\ x_{21} \\ x_{31} \\ ... \\ x_{k1} \end{bmatrix} \\ X_2=\begin{bmatrix} x_{12} \\ x_{22} \\ x_{32} \\ ......
Read More

How to calculate eigenvalues and eigenvectors using Python?

by | October 3, 2023 | Featured, Linear Algebra | 0 Comments

In our previous article, we discussed what eigen values and eigenvectors of a square matrix are and how we can calculate the eigenvalues and eigenvectors of a square matrix mathematically. We discussed that if A is a square matrix, then $latex (A- \lambda I) \vec{u}=0...
Read More

Amrita Mitra

Author

Ms. Amrita Mitra is an author, who has authored the books “Cryptography And Public Key Infrastructure“, “Web Application Vulnerabilities And Prevention“, “A Guide To Cyber Security” and “Phishing: Detection, Analysis And Prevention“. She is also the founder of Asigosec Technologies, the company that owns The Security Buddy.

0 Comments

Submit a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Not a premium member yet?

Please follow the link below to buy The Security Buddy Premium Membership.

Buy Premium Membership

Featured Posts

Translate »