维吉尼亚密码破解Word文档下载推荐.docx
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维吉尼亚密码破解Word文档下载推荐.docx
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首先,通过求重复子串偏移量的最大公约数的方法,得出密钥长度为4.
然后将文件分成4个文件,分别统计字母频率。
发现每个表均有一个字母频率异常的高:
刚开始猜测该字母为e和符号的频率之和,后来将该字母替换掉后,发现字频统计大致还是符合正常的字符频率,所以e应该不包括在内。
然后猜测该字母代表的是符号,同时为了防止通过字频统计破解,可能将字频最小的字母z也归到了其中(假设)。
接下来,把分别该字母替换成_,相当于将文章中的单词分了出来。
再次对各表对应的文本进行频率统计,如下:
发现4个文件的字母频率排序非常相近,再与标准字母频率对比发现,基本上相当于循环下移了一位。
由于四个单表的字母频率非常相近,这里我们选择将直接将四个表统一为zetaoinshrdlcumwfgypbvkjxq,通过不断修正四个表从而一步一步接近正确答案,大概直接替换进去,就可以发现这是乔布斯在斯坦福大学的演讲稿,因为之前背过。
。
但是,我们组做了一些可能是无用功的东西,就是把四个表都对应了出来,分别是:
zetoairnsdhlufywcmgpvbkjxq
zetoainsrhlduywgmcpfbvkjxq
zetaoinslrhduwpymcgfvbkjxq
zetaoinrhsdlywcufgmpbvkxjq
通过这四个表进行替换,可以对绝大部分密文进行还原,其余的极少部分单词也可以通过人工识别出来,这里由于时间。
实在紧迫,就调到这里了。
可以发现,2个_连在一起是表示句号,单个可以表示空格、单引号等,多个(6个)连在一起,表示换行符。
破解之后的明文如下(未将_替换回正常的符号,这里仅起到分割单词的作用,不必替换。
):
i_am_honored_to_be_with_you_today_at_your_commencement_from_one_of_the_finest_universities_in_the_world__i_never_graduated_from_college__truth_be_told__this_is_the_closest_i_ve_ever_gotten_to_a_college_graduation__today_i_want_to_tell_you_three_stories_from_my_life__that_s_it__no_big_deal__just_three_stories______the_first_story_is_about_connecting_the_dots______i_dropped_out_of_reed_college_after_the_first___months__but_then_stayed_around_as_a_drop_in_for_another____months_or_so_before_i_really_quit__so_why_did_i_drop_out______it_started_before_i_was_born__my_biological_mother_was_a_young__unwed_college_graduate_student__and_she_decided_to_put_me_up_for_adoption__she_felt_very_strongly_that_i_should_be_adopted_by_college_graduates__so_everything_was_all_set_for_me_to_be_adopted_at_birth_by_a_lawyer_and_his_wife__ejcept_that_when_i_popped_out_they_decided_at_the_last_minute_that_they_really_wanted_a_girl__so_my_parents__who_were_on_a_waiting_list__got_a_call_in_the_middle_of_the_night_asking___we_have_an_unexpected_baby_boy__do_you_want_him___they_said___of_course___my_biological_mother_later_found_out_that_my_mother_had_never_graduated_from_college_and_that_my_father_had_never_graduated_from_high_school__she_refused_to_sign_the_final_adoption_papers__she_only_relented_a_few_months_later_when_my_parents_promised_that_i_would_someday_go_to_college______and____years_later_i_did_go_to_college__but_i_naively_chose_a_college_that_was_almost_as_ejpensive_as_stanford__and_all_of_my_working_class_parents_savings_were_being_spent_on_my_college_tuition__after_sij_months__i_couldn_t_see_the_value_in_it__i_had_no_idea_what_i_wanted_to_do_with_my_life_and_no_idea_how_college_was_going_to_help_me_figure_it_out__and_here_i_was_spending_all_of_the_money_my_parents_had_saved_their_entire_life__so_i_decided_to_drop_out_and_trust_that_it_would_all_work_out_ok__it_was_pretty_scary_at_the_time__but_looking_back_it_was_one_of_the_best_decisions_i_ever_made__the_minute_i_dropped_out_i_could_stop_taking_the_required_classes_that_didn_t_interest_me__and_begin_dropping_in_on_the_ones_that_looked_interesting______it_wasnot_all_romantic__i_didn_t_have_a_dorm_room__so_i_slept_on_the_floor_in_friends__rooms__i_returned_coke_bottles_for_the_five_deposits_to_buy_food_with__and_i_would_walk_the_seven_miles_across_town_every_sunday_night_to_get_one_good_meal_a_week_at_the_hare_krishna_temple__i_loved_it__and_much_of_what_i_stumbled_into_by_following_my_curiosity_and_intuition_turned_out_to_be_priceless_later_on__let_me_give_you_one_example______reed_college_at_that_time_offered_perhaps_the_best_calligraphy_instruction_in_the_country__throughout_the_campus_every_poster__every_label_on_every_drawer__was_beautifully_hand_calligraphed__because_i_had_dropped_out_and_didn_t_have_to_take_the_normal_classes__i_decided_to_take_a_calligraphy_class_to_learn_how_to_do_this__i_learned_about_serif_and_san_serif_typefaces__about_varying_the_amount_of_space_between_different_letter_combinations__about_what_makes_great_typography_great__it_was_beautiful__historical__artistically_subtle_in_a_way_that_science_can_t_capture__and_i_found_it_fascinating______none_of_this_had_even_a_hope_of_any_practical_application_in_my_life__but_ten_years_later__when_we_were_designing_the_first_macintosh_computer__it_all_came_back_to_me__and_we_designed_it_all_into_the_mac__it_was_the_first_computer_with_beautiful_typography__if_i_had_never_dropped_in_on_that_single_course_in_college__the_mac_would_have_never_had_multiple_typefaces_or_proportionally_spaced_fonts__and_since_windows_just_copied_the_mac__its_likely_that_no_personal_computer_would_have_them__if_i_had_never_dropped_out__i_would_have_never_dropped_in_on_this_calligraphy_class__and_personal_computers_might_not_have_the_wonderful_typography_that_they_do__of_course_it_was_impossible_to_connect_the_dots_looking_forward_when_i_was_in_college__but_it_was_very__very_clear_looking_backwards_ten_years_later______again__you_can_t_connect_the_dots_looking_forward__you_can_only_connect_them_looking_backwards__so_you_have_to_trust_that_the_dots_will_somehow_connect_in_your_future__you_have_to_trust_in_something___your_gut__destiny__life__karma__whatever__this_approach_has_never_let_me_down__and_it_has_made_all_the_difference_in_my_life______my_second_story_is_about_love_and_loss______i_was_lucky__c_i_found_what_i_loved_to_do_early_in_life__wo__and_i_started_apple_in_my_parents_garage_when_i_was_____we_worked_hard__and_in____years_apple_had_grown_from_just_the_two_of_us_in_a_garage_into_a____billion_company_with_over______employees__we_had_just_released_our_finest_creation___the_macintosh___a_year_earlier__and_i_had_just_turned_____and_then_i_got_fired__how_can_you_get_fired_from_a_company_you_started__well__as_apple_grew_we_hired_someone_who_i_thought_was_very_talented_to_run_the_company_with_me__and_for_the_first_year_or_so_things_went_well__but_then_our_visions_of_the_future_began_to_diverge_and_eventually_we_had_a_falling_out__when_we_did__our_board_of_directors_sided_with_him__so_at____i_was_out__and_very_publicly_out__what_had_been_the_focus_of_my_entire_adult_life_was_gone__and_it_was_devastating______i_really_didn_t_know_what_to_do_for_a_few_months__i_felt_that_i_had_let_the_previous_generation_of_entrepreneurs_down___that_i_had_dropped_the_baton_as_it_was_being_passed_to_me__i_met_with_david_packard_and_bob_noyce_and_tried_to_apologi_e_for_screwing_up_so_badly__i_was_a_very_public_failure__and_i_even_thought_about_running_away_from_the_valley__but_something_slowly_began_to_dawn_on_me__c_i_still_loved_what_i_did__the_turn_of_events_at_apple_had_not_changed_that_one_bit__i_had_been_rejected__but_i_was_still_in_love__and_so_i_decided_to_start_over______i_didn_t_see_it_then__but_it_turned_out_that_getting_fired_from_apple_was_the_best_thing_that_could_have_ever_happened_to_me__the_heaviness_of_being_successful_was_replaced_by_the_lightness_of_being_a_beginner_again__less_sure_about_everything__it_freed_me_to_enter_one_of_the_most_creative_periods_of_my_life______during_the_nejt_five_years__i_started_a_company_named_next__another_company_named_pixar__and_fell_in_love_with_an_ama_ing_woman_who_would_become_my_wife__pixar_went_on_to_create_the_worlds_first_computer_animated_feature_film__toy_story__and_is_now_the_most_successful_animation_studio_in_the_world__in_a_remarkable_turn_of_events__apple_bought_nejt__i_retuned_to_apple__and_the_technology_we_developed_at_next_is_at_the_heart_of_apple_s_current_renaissance__and_laurene_and_i_have_a_wonderful_family_together______i_m_pretty_sure_none_of_this_would_have_happened_if_i_hadn_t_been_fired_from_apple__it_was_awful_tasting_medicine__but_i_guess_the_patient_needed_it__sometimes_life_hits_you_in_the_head_with_a_brick__don_t_lose_faith__i_m_convinced_that_the_only_thing_that_kept_me_going_was_that_i_loved_what_i_did__you_ve_got_to_find_what_you_love__and_that_is_as_true_for_your_work_as_it_is_for_your_lovers__your_work_is_going_to_fill_a_large_part_of_your_life__and_the_only_way_to_be_truly_satisfied_is_to_do_what_you_believe_is_great_work__and_the_only_way_to_do_great_work_is_to_love_what_you_do__if_you_haven_t_found_it_yet__keep_looking__don_t_settle__as_with_all_matters_of_the_heart__you_ll_know_when_you_find_it__and__like_any_great_relationship__it_qust_gets_better_and_better_as_the_years_roll_on__so_keep_looking_until_you_find_it__don_t_settle______my_third_story_is_about_death______when_i_was_____i_read_a_xuote_that_went_something_like___if_you_live_each_day_as_if_it_was_your_last__someday_you_ll_most_certainly_be_right___it_made_an_impression_on_me__and_since_then__for_the_past____years__i_have_looked_in_the_mirror_every_morning_and_asked_myself___if_today_were_the_last_day_of_my_life__would_i_want_to_do_what_i_am_about_to_do_today___and_whenever_the_answer_has_been__no__for_too_many_days_in_a_row__i_know_i_need_to_change_something______remembering_that_i_ll_be_dead_soon_is_the_most_important_tool_i_ve_ever_encountered_to_help_me_make_the_big_choices_in_life__because_almost_everything__c_all_ejternal_expectations__all_pride__all_fear_of_embarrassment_or_failure___these_things_just_fall_away_in_the_face_of_death__leaving_only_what_is_truly_important__remembering_that_you_are_going_to_die_is_the_best_way_i_know_to_avoid_the_trap_of_thinking_you_have_something_to_lose__you_are_already_naked__there_is_no_reason_not_to_follow_your_heart______about_a_year_ago_i_was_diagnosed_with_cancer__i_had_a_scan_at______in_the_morning__and_it_clearly_showed_a_tumor_on_my_pancreas__i_didn_t_even_know_what_a_pancreas_was__the_doctors_told_me_this_was_almost_certainly_a_type_of_cancer_that_is_incurable__and_that_i_should_expect_to_live_no_longer_than_three_to_six_months__my_doctor_advised_me_to_go_home_and_get_my_affairs_in_order__which_is_doctor_s_code_for_prepare_to_die__it_means_to_try_to_tell_your_kids_everything_you_thought_you_d_have_the_next____years_to_tell_them_in_just_a_few_months__it_means_to_make_sure_everything_is_buttoned_up_so_that_it_will_be_as_easy_as_possible_for_your_family__it_means_to_say_your_goodbyes______i_lived_wi
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