Pelcgbtencul

Transcript

1. A Quick and Hyper-Biased History on Pelcgbtencul K
2. 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.
3. Preflight Check - ROT13 - ROTate by 13 places - One of the simplest form (nowadays) of cryptography From ABCDEFGHIJKLMNOPQRSTUVWXYZ To NOPQRSTUVWXYZABCDEFGHIJKLM
4. u r not first bro
5. 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.
6. Frequency Analysis (~800 CE) - Mostly attributed to Al-Kindi, an Arab mathematician
7. Perhaps I could understand what this means by Frequency Analysis? No, silly.
9. Frequency Analysis (~800 CE) [cont'd 1] - The Adventure of Dancing Men (Arthur Conan Doyle, 1903)
10. 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;‡?;
13. Vigenere Cipher (1553) - Finally a polyalphabetic cipher. - Mapping a plaintext with repeating key patterns
14. Jefferson Disk (1795) Key as arrangement of rings.
15. Playfair Cipher (1854) - Using a square as a key, and rearrange plaintext as pair while encrypting by using respective monographic diagonals.
16. The End? Mmm.