Question

_________ is designated as FIPS 197 and can have three different key sizes. They are: 128, 192, or 256 bits. This algorithm was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen. Unlike both DES and 3DES, it is not based on a Feistel network. This algorithm uses a substitution-permutation matrix rather than a Feistel network. It also operates on a four-by-four column-major order matrix of bytes, called the state.

Answer 1

AES (Advanced Encryption Standard) is designated as FIPS 197 and can have three different key sizes: 128, 192, or 256 bits. This algorithm was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen.

Step-by-step explanation:

AES, or Advanced Encryption Standard, is a widely used symmetric encryption algorithm that is designated as FIPS 197. It supports three different key sizes: 128, 192, or 256 bits. The algorithm was developed by Belgian cryptographers Joan Daemen and Vincent Rijmen. Unlike both DES (Data Encryption Standard) and 3DES (Triple DES), AES does not rely on a Feistel network structure.

Instead, AES employs a substitution-permutation network (SPN) structure, which involves a series of substitution and permutation operations on the input data. The algorithm operates on a four-by-four column-major order matrix of bytes, known as the state. This matrix undergoes various transformations during the encryption and decryption processes. The substitution-permutation matrix enhances the algorithm's security and efficiency.

AES has become the de facto standard for symmetric encryption due to its robustness, efficiency, and widespread adoption. The choice of key size (128, 192, or 256 bits) allows users to balance between security and performance based on their specific needs and requirements. Overall, AES's design and cryptographic properties make it a reliable and secure choice for protecting sensitive information in various applications and industries.