by paul flanagan https://padlet.com/Flanners00/CipherBlueTeam en-us 2016-03-15 17:37:47 UTC 2023-10-13 17:15:28 UTC hello@padlet.com What is a Vernam Cipher? Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101117859 Why the Capital V? How does it work?]]> 2016-03-15 17:37:57 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101117859 This may help..... Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101118177 2016-03-15 17:38:58 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101118177 Get this book and materials Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101118769 Check out the Vigenere Cipher code - Analyse it and be ready to explain how it works]]> 2016-03-15 17:40:54 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101118769 What is a One Time Pad Cipher? Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101119013 How is this robust?]]> 2016-03-15 17:41:43 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101119013 EOF Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101121552 2016-03-15 17:50:43 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101121552 What about Enigma? Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101121747 Use this link to try to explain the complexity of the coding system]]> 2016-03-15 17:51:16 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101121747 Answer Flanners00 https://padlet.com/Flanners00/CipherBlueTeam/wish/101122227 2016-03-15 17:52:55 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101122227 Capital V because it's the name of a person https://padlet.com/Flanners00/CipherBlueTeam/wish/101225536 2016-03-16 09:19:19 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101225536 Total number of possible ways in which a standard army-issue Enigma machine could be set up was 158,962,555,217,826,360,000 https://padlet.com/Flanners00/CipherBlueTeam/wish/101225757
60 x 17,576 x 676 x 150,738,274,937,250]]> 2016-03-16 09:20:37 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101225757 https://padlet.com/Flanners00/CipherBlueTeam/wish/101225799 This cipher is impossible to crack:
* no matter how powerful your computer is
* how much time you have to crack it
* or how clever of a hacker you are. ]]> 2016-03-16 09:20:53 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101225799 https://padlet.com/Flanners00/CipherBlueTeam/wish/101225910 The Vernam Cipher is based on the principle that each plaintext character from a message is 'mixed' with one character from a key stream]]> 2016-03-16 09:21:38 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101225910 https://padlet.com/Flanners00/CipherBlueTeam/wish/101226057 It is a Vigenère cipher where:

1.      The key is exactly as long as the message that is encrypted.
2.      The key is made up of truly random symbols.
3.      The key is used one time only, and never used again for any other message.

]]> 2016-03-16 09:22:24 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101226057 https://padlet.com/Flanners00/CipherBlueTeam/wish/101226980 The key for the one-time pad cipher is called a pad because they were printed on pads of paper. The top sheet of paper would be torn off the pad after it was used to reveal the next key to use.]]> 2016-03-16 09:27:21 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101226980 https://padlet.com/Flanners00/CipherBlueTeam/wish/101227554 plaintext + key = Ciphertext(text encryted ready for transmission)

Ciphertext + key = Plaintext]]> 2016-03-16 09:30:30 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101227554 https://padlet.com/Flanners00/CipherBlueTeam/wish/101228775 2016-03-16 09:36:46 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101228775 https://padlet.com/Flanners00/CipherBlueTeam/wish/101229011 You don't have to use  a new program because the Vigenère program can implement this cipher without any changes. But this cipher is so inconvenient to use on a regular basis that it is often only used for the most top-secret of messages.]]> 2016-03-16 09:38:03 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101229011 https://padlet.com/Flanners00/CipherBlueTeam/wish/101229808 Army issue Enigma machines had three revolving "wheels" or "rotors" that could be taken out and changed about.The first task for an Enigma operator would be to decide which rotor went in which position. There were five rotors to choose from and they could be inserted into three positions on the Enigma machine.


]]> 2016-03-16 09:42:09 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101229808 https://padlet.com/Flanners00/CipherBlueTeam/wish/101229826 Since any English plaintext could have been used to create a ciphertext with equal number of letters, it is completely impossible to hack a message encrypted with a one-time pad]]> 2016-03-16 09:42:14 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101229826 https://padlet.com/Flanners00/CipherBlueTeam/wish/101230085 If a random key stream is used, the resulting cipher text will be random and have no resemblance to the plain text.  This makes the Vernam cipher similar to the One Time Pad cipher]]> 2016-03-16 09:43:28 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101230085 The number of ways of choosing m pairs out of n objects is https://padlet.com/Flanners00/CipherBlueTeam/wish/101230764
n! /((n-2m)! m! 2m)

]]> 2016-03-16 09:46:54 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101230764 https://padlet.com/Flanners00/CipherBlueTeam/wish/101230901 Most possibly the most famous cipher of recent years, the Enigma cipher, this machine was developed in 1918 and used in German intelligence in World War II to stop the allied forces from knowing what they were talking about.]]> 2016-03-16 09:47:37 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101230901 https://padlet.com/Flanners00/CipherBlueTeam/wish/101231135 One-Time Tape, or OTT, is an automated digital variant of the so-called One Time Pad]]> 2016-03-16 09:49:00 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101231135 https://padlet.com/Flanners00/CipherBlueTeam/wish/101231331 If the resulting cipher text is random, the cipher text can be sent over the air without anybody being able to decipher it. For the cipher text to be deciphered, the receiver needs the OTT in order to mix it with the cipher text to reveal the plaintext.]]> 2016-03-16 09:49:37 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101231331 https://padlet.com/Flanners00/CipherBlueTeam/wish/101231340 practically just a complicated substitution cipher machine.   ]]> 2016-03-16 09:49:41 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101231340 Counting the Possible Plugboard Settings https://padlet.com/Flanners00/CipherBlueTeam/wish/101231442 2016-03-16 09:50:04 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101231442 https://padlet.com/Flanners00/CipherBlueTeam/wish/101231927 Every month, a German code sender would receive a code book outlining the key used for each day, which might look like this one.]]> 2016-03-16 09:52:28 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101231927 https://padlet.com/Flanners00/CipherBlueTeam/wish/101232024 As long as the OTT is random and is destroyed after use, the cipher text cannot be deciphered by a spy.]]> 2016-03-16 09:52:52 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101232024 https://padlet.com/Flanners00/CipherBlueTeam/wish/101232568 2016-03-16 09:55:40 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101232568 https://padlet.com/Flanners00/CipherBlueTeam/wish/101232652 The machine came with rotors each rotor had within a random substitution alphabet, the user would choose between 3-5 rotors at any one time (depending on the size of the size if the machine) and the plug board is another type of the machine, certain letters would be connected reciprocally to each other

]]> 2016-03-16 09:56:05 UTC https://padlet.com/Flanners00/CipherBlueTeam/wish/101232652