These enhancements are designed to protect against, for example, chosen-plaintext attack cryptanalysis.
This is a general rule of cryptanalysis: with no additional information it is impossible to decode this message.
Means of information gathering are both overt and covert and may include espionage, communication interception, cryptanalysis, cooperation with other institutions, and evaluation of public sources.
A variety of refinements to the attack have been suggested, including using multiple linear approximations or incorporating non-linear expressions, leading to a generalized partitioning cryptanalysis.
This seems to have been on the advice of a mathematician, who lacked a background in cryptanalysis.
Great advances were made in both cipher design and cryptanalysis, all in secrecy.
It is responsible for cryptanalysis and encryption of sensitive data.
The first is that it minimizes the exposure of any given key-encrypting key, making cryptanalysis more difficult.
