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Pelcgbtencul
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Oursky Limited
September 10, 2012
Technology
1
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Pelcgbtencul
Oursky Limited
September 10, 2012
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Transcript
A Quick and Hyper-Biased History on Pelcgbtencul K
Be noted that... We are focusing on algorithms while neglecting
the artifacts that enable it in a pre-computer era in this short presentation. ...And focusing on an pre-Industrial Revolution era.
Preflight Check - ROT13 - ROTate by 13 places -
One of the simplest form (nowadays) of cryptography From ABCDEFGHIJKLMNOPQRSTUVWXYZ To NOPQRSTUVWXYZABCDEFGHIJKLM
u r not first bro
Caesar Cipher (~80 BCE) - Shifting every characters by 3
- Currently, sometimes it is generalized as "generalized Caesar cipher", or "monoalphabetic substitution". - Of course, it ain't secure at all.
Frequency Analysis (~800 CE) - Mostly attributed to Al-Kindi, an
Arab mathematician
Perhaps I could understand what this means by Frequency Analysis?
No, silly.
None
Frequency Analysis (~800 CE) [cont'd 1] - The Adventure of
Dancing Men (Arthur Conan Doyle, 1903)
Frequency Analysis (~800 CE) [cont'd 2] - The Gold-Bug (Edgar
Allan Poe, 1843) 53‡‡†305))6*;4826)4‡.)4‡);806*;48†8 ¶60))85;1‡(;:‡*8†83(88)5*†;46(;88*96 *?;8)*‡(;485);5*†2:*‡(;4956*2(5*—4)8 ¶8*;4069285);)6†8)4‡‡;1(‡9;48081;8:8‡ 1;48†85;4)485†528806*81(‡9;48;(88;4 (‡?34;48)4‡;161;:188;‡?;
None
None
Vigenere Cipher (1553) - Finally a polyalphabetic cipher. - Mapping
a plaintext with repeating key patterns
Jefferson Disk (1795) Key as arrangement of rings.
Playfair Cipher (1854) - Using a square as a key,
and rearrange plaintext as pair while encrypting by using respective monographic diagonals.
The End? Mmm.