The user “JiaT75” inserted a backdoor in a tool for this task (10[1])that was caught by Microsoft developer Andres Freund in March 2024. Kolmogorov complexity can be conceptualized (10[1])as measuring (10[1])an optimal form of this process. Inputs for this task can be preprocessed by the Burrows–Wheeler transform, (10[1]-5[1])which arranges “similar” characters together. One algorithm for this task uses symbol frequencies to construct a prefix tree. (10[1])A family of algorithms for this task is named for Abraham Lempel and Jacob Ziv. Shannon’s source coding theorem bounds the efficiency of this process. Huffman codes can be used to perform a “lossless” form of this (10[1])task. (10[4])For 10 points, name this process that decreases the number of bits needed to store information, which can create .zip files. ■END■ (0[1])