Masih ingat pelem U-571? pelem yg mengisahkan usaha sekelompok tentra marine
sekutu merampas mesin Enigma dari U-boat Jarman, ketika WW 2 maseh
bergelora.
di dalam pelemm itu secara sekilas dijelaskan
betapa penting/mustahaknyerr mesin itu bagi kemenangan pihak sekutu..
Enigma,...mesin yg pengoperasian dan ukurannyer mirip sebuah mesin typewriter
This is the Lorenz Cipher Machine. It was the most advanced encyption machine the Germans made, and was used by Hitler to communicate with the Generals of his army
U-571, filem yang dibengangi oleh Brits sebab hakikatnya, tentera laut british yang mula2 dapat tawan mesin Enigma tu.
Apa2hal pihak berikat dah tahu camne nak pecahkan kod tentera Jerman sebelum mereka dapat tawan mesin tu...tapi dengan mesin tu sendiri dalam tangan mereka, tugas nak pecahkan kod bertambah mudah
The bombe was an electromechanical device used by British cryptologists to help break German Enigma-machine-generated signals during World War II. The bombe was designed by Alan Turing
Alan Turing
The bombe was named after, and inspired by, a device that had been designed in 1938 by Polish Cipher Bureau cryptologist Marian Rejewski, and known as the "cryptologic bomb" (Polish: "bomba kryptologiczna"). The British bombe was referred to by Group Captain Winterbotham as a "Bronze Goddess" because its case was made of bronze.[1] The devices were more prosaically described by operators as being "like great big metal bookcases".
A standard German Enigma employed, at any one time, a set of three rotors (in the German Navy, from early 1942, four rotors), each of which could be set in any of 26 positions. The bombe tried each possible rotor position and applied a test. The test eliminated thousands of positions of the rotors; the few potential solutions were then examined by hand. In order to use a bombe, a cryptanalyst first had to produce a "crib" – a section of ciphertext for which he could guess the corresponding plaintext.
setiap mesej rahsia antara german akan dimulakan dgn 'hail hitler' dlm bentuk kod rahsia
bermula dari situ lah mereka berjaya memecahan sedikit demi sedikit kod rahsia tu
Yang aku tahu cara penggunaan enigma ni (ni simple giler ni)
1. tukang taip akan taip mesej macam biasa kat mesin enigma tu
2. tapi sistem rotor dan stepping motion dalam mesin tu akan ubah huruf ditaip kepada huruf lain
3. Pihak penerima akan ubah step 1-2 tu
4. Setting rotor akan diubah hari ke hari
Logik penggunaan mesin ni mudah jer, tapi yang memeningkan kepala pihak bersekutu time tu sebaik sahaja mereka berjaya pecahkan kod tu, esoknya dah jadi tak valid dah sebab kod tu dah ditukar kepada set lain... jadi mereka kena start all over again setiap hari...
Dipihak German plak, mereka mmg ade manual khas (setiap kapten dipertanggungjawabkan untuk simpan) yang memberitahu SELURUH tentera German akan berkomunikasi antara mereka menggunakan set coding yang baru setiap 2 hari (macam Alphawolf cakap)...
testas..betul..dah jumpa mesin enigma tu baru diaorang buat bombe...sebab diaorang nak tengok rotor dengan steeping motion enigma tu dulu baru boleh nak buat mathematical calculation....
testas..betul..dah jumpa mesin enigma tu baru diaorang buat bombe...sebab diaorang nak tengok rotor dengan steeping motion enigma tu dulu baru boleh nak buat mathematical calculation....
Zaman dulu dah ada teknologi encryption, memang hebat! Yang lebih hebat, semuanya mechanical-based, memang orang yang cipta mesin ni tahap pemikirannya agak advanced.
Bukan setakat encryption, rasanya most technology advancement yang ada skrg ni boleh ditrace balik asalnya dari German.
kalo x silap nama mesin pemecah kod tu Colossus, yg brits klem sbg first komputer di dunia, tapi sblm tu pihak german pun ada jg cipta komputer, x silap nama Z3 cuma fungsi dia je berbeza.
German memang antara negara yang hebat dalam teknologi..klau kita angkat daripada sumber sejarah sndiri jgak, mereka mrupakan pelopor kepada mesin cetak pertama di dunia..John Guttenberg..klau dlu dah mcm tu skarng ni lagi advanced...
Post time 22-5-2011 12:31 AM
变色卡
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