text: In the case of a block cipher , it refers to a set of techniques for tracing differences through the network of transformations , discovering where the cipher exhibits non-random behavior , and exploiting such properties to recover the secret key .
simplified: In the case of a block cipher , it refers to a set of techniques and methods for tracing differences through the network of transformations , discovering where the cipher demonstrates non-random behavior , and extend such properties to recover the secret key .