Enigma machine and cryptography. by Chris Davis
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1 Enigma machine and cryptography by Chris Davis
2 Greeks rearranging words Hello world -> ehlol owrdl
3 Caesar Cipher Hello Charlie qmttw Kpiztqm a b c d e f g h i j k l m n o p q r s t u v w x y z i j k l m n o p q r s t u v w x y z a b c d e f g h
4 Advanced substitution Cipher Mix letters Hello Charlie 85ccf 381ic95 Conng Hcisnqo a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d e f g h i j k l m n o p q i p h b o s f c q z j n t w g l m y r x d k e u v a
5 Vigenere Cipher tbshsmathsphysicssociety- 24 key: robin robinrobinrobinrobinrobi
6 Vigenere Cipher
7 Vigenere Cipher tbshsmathsphysicssociety- 24 key robin robinrobinrobinrobinrobi kptpfdoupfgvzavtgtwpzsug
8 Long Cipher Crowd of generally working classes were gathered from around greater manchester to protest for parliamentary representation. The Local Magistrates panicked and read riot act to crowd, but little of the crows could hear them. 600 Hussars (light infantry), several hundred infantrymen, 400 men of Cheshire cavalry, an artillery unit with 2 6 pounder guns, some local Yeomanry and 400 special constables. These forces were given the task of arresting the protesters, but some of the Yeomanry had grudges with Protesters and many were drunk. So they charged, and slashed at protesters and banners. The soldiers though this was the crowd attacking the Yeomanry and charged. Many attacked but a few resisted and tried to take the swords of the yeomanry crying for shame gentlemen killed and injured. Members of the protesters put on trial, Hussars and Magistrates cleared of any wrong, received congratulations from Prince regent
9 Long Cipher crowdofgenerallyworkingclassesweregatheredfromaroundgreatermanchestert oprotestforparliamentaryrepresentationthlocalmagistratespanickedandreadrio tacttocrowdbutlittleofthecrowscouldhearthemsixhundredhussarslightinfantrys everalhundredinfantrymenfourhundredmenofcheshirecavalryanartilleryunitwi thtwosixpoundergunssomelocalyeomanryandfourhundredspecialconstablesthes eforcesweregiventhetaskofarrestingtheprotestersbutsomeoftheyeomanryhadg rudgeswithprotestersandmanyweredrunksotheychargedandslashedatprotesters andbannersthesoldiersthoughtthiswasthecrowdattackingtheyeomanryandcharg edmanyattackedbutafewresistedandtriedtotaketheswordsoftheyeomanrycryin gforshamegentlemeneleventofifteenkilledandfourhundredtosevenhundredinju redmembersoftheprotestersputontrialhussarsandmagistratesclearedofanywron greceivedcongratulationsfromprinceregent Key: mrhows
10 Long Cipher oivkzgrxlbajmcsmsgdbpbcuxrzgakivyscsfylfavrivawjalurcjqrasnemejvakfvyhkh dfasolrfydwjxzhaaffrymnwbilgaffrawkffyscysxdhuekfihhakbruwycquhbzjqrkfeg frjhpgoivkztgkswplxvvtpzqtycskofbzzzqryhdwyjpldmzuyszzgjzonkxznvpazwhbp jkjljajmcoijvdvkwjxmeafueqemcqjtlurnwpdlbkxoylgdadvjorsxifojsdkpzhwdpb belizavpoajpllggeksnygezgkeqcvqwdkvvawfdphbzxalyvqfpilrohqtpohuaezhwtx vzhdwevmcnuqjdsnwszcsjltvaoocawhfnwekpbcltvwfklqjasnknlagkeqfmhdwkvv awfdpoozydlkuakizavljaklgpwdjhbzemefkajquyijcefavaqoyhfcwprurodmjoszsf gycpweklfoszuiojfqizhdwefsrewdjavkmsyahdaenhgpzqtycsvmkaoycuenhdwkvv awfdphbzutryuavyrumwlfrjyavnlaobwiilgekfvkojvfipszlakhyaltvzkkjpjvtpzqplci szifqnquentkjeyhaayqeazaeqelzanqeacbarklsjcucsszszumcqjtlurnwpkvganqeoi jvdvkwjbgilriwyslfogrkosljaklgpwdjwipgzkywwdtlzgwjerurisszzhnsfvzqhwmilrk xmefkngzxysywumlrygzxyopmxrawkfewycihdzuqajqxlbp
11 The Perfect Vigenere Cipher Remove space Minimal words Random words and letters Use Shorthand Never give away key
12 Advancing the Cipher I apply Cipher Send They put on a Cipher They send it back I remove my Cipher Send it to them They remove their Cipher Decoded message
13 Enigma machine Arthur Scherbius companies transferring trade secrets Chiffriermaschinen Aktiengesellschaft Soon used by German navy, army and air force by 1933
14 How it works
15 How it works Electrical connections Voltage when trigger at top moves to the bottom 403,291,461,126,605,635,584,000,000 in one
16 How it works Caesar shift Completely new set of conections
17 How it works
18 Reflector Willi Korn Connects back to another point Passed back through, 7 total shifts Made it simpler, no letter can remain the same Reciprocal
19 Construction 3 basic wheels Same buried wiring 4 and 5 added later
20 Construction
21 Use Day Wheel order Ring settings Reflector settings 150,738,274,937,250 possible states
22 Breaking the code Intercepting key Reciprocal No repeated letter Broken by Polish Breaking green Breaking red
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Sol: First, calculate the number of integers which are relative prime with = (1 1 7 ) (1 1 3 ) = = 2268
ò{çd@àt ø 2005.0.3. Suppose the plaintext alphabets include a z, A Z, 0 9, and the space character, therefore, we work on 63 instead of 26 for an affine cipher. How many keys are possible? What if we add
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