In 1997, the National Institute of Standards and Technology (NIST) initiated an activity to choose a symmetric-key encryption algorithm to be utilized to protect delicate (unclassified) Government information in furtherance of NISTs statutory responsibilities. stop in during each circular using substitutions and linear transformations parallel; thus, both of these finalists are types of substitution-linear change… Continue reading In 1997, the National Institute of Standards and Technology (NIST) initiated