AES encryption decryption, encryption tool

Introduction to AES

The Advanced Encryption Standard (AES) is a symmetric encryption algorithm published by the National Institute of Standards and Technology (NIST) in 2001 to replace the original DES (Data Encryption Standard). AES features high efficiency and security and is widely used in various fields.

Origin of AES

With the development of computer technology, the key length of the DES algorithm gradually became insufficiently secure. In 1997, NIST launched an open competition, inviting cryptographers worldwide to submit new encryption algorithms. After multiple rounds of screening and evaluation, the Rijndael algorithm designed by Belgian cryptographers Joan Daemen and Vincent Rijmen emerged victorious and became the AES standard.

Principle of AES

AES is a block cipher that divides plaintext into fixed-length blocks (usually 128 bits) and then encrypts each block using a key. AES supports key lengths of 128 bits, 192 bits, and 256 bits. The encryption process consists of multiple rounds of transformations, each round including operations such as substitution, permutation, mixing, and key addition. The decryption process is the inverse of the encryption process.

Use Cases of AES

• Data Transmission Encryption: In network communication, such as the HTTPS protocol, AES encryption is used to protect the security of data during transmission.
• Data Storage Encryption: Encrypt data on storage devices such as hard drives and USB flash drives to prevent data leakage.
• Mobile Applications: Protect user data in mobile applications, such as user login information and transaction records.
• Cloud Computing: Encrypt user data in cloud computing environments to ensure data privacy and security.