Update double_and_triple_ciphering.tex

грамматическая ошибка
Update Cryptanalysis_methods_and_types_of_attacks.tex

грамматическая ошибка
Merge pull request #611 from stanislavkruglik/patch-26

Update double_and_triple_ciphering.tex
Merge pull request #616 from stanislavkruglik/patch-31

Update Cryptanalysis_methods_and_types_of_attacks.tex
Merge pull request #6 from vlsergey/master

обновление