Which encryption standard has been superseded by AES?

The encryption standard that has been superseded by AES is DES, which stands for Data Encryption Standard. Developed in the 1970s, DES became widely used as a symmetric-key algorithm for data encryption. However, over time, vulnerabilities were discovered in its security, primarily due to advances in computational power that made brute force attacks feasible against its relatively short key length of 56 bits.

As a response to the increasing need for stronger encryption methods, the National Institute of Standards and Technology (NIST) developed the Advanced Encryption Standard (AES), which was formally adopted in 2001. AES offers improved security and supports key lengths of 128, 192, and 256 bits, making it far more resilient against attacks than DES.

The selection of AES as a successor established a new level of security standards for data encryption in various applications, rendering DES outdated and less secure for modern encryption needs.