Class notes
Cipher-types
- Course
- Introduction to Cryptography
- Institution
- University Of Toronto (U Of T )
notes on different types of ciphers
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Cipher Strengths Weaknesses Notable ExamplesCaesar Easy to use Very weak to brute ROT13, still used
force (can be one of today for spoilers on
Filthy G*ullic 25 keys) online forums
barbarians couldnt
even read so it very susceptible to The conquest of G*ul
worked pretty well frequency analysis
Affine more complex key Extremely weak to
than Caesar cipher frequency analysis
modular math makes only 12 options for
it hard to decode for the value of alpha
the layman
General more “random”, which susceptible to 1876 US general
Monoalphabetic is better frequency analysis elections, democrats
Substitution and analysis of tried bribing their way
I guess it’s better common digraphs to victory, used
than no encryption at and trigraphs encrypted messages
all
Vigenere polyalphabetic it is basically a more designed in the 16th
substitution, much complex caesar century
better than cipher, so if one
monoalphabetic knows the key length, Confederate States
frequency analysis used it in the civil
you only need to can be used war, with the keys
know the key to being:
encrypt plaintext because the key
repeats, there may MachesterBluff
frequency analysis on be something useful Complete Victory
the whole text is attained in frequency Come Retribution
useless analysis of digraphs
and trigraphs Which were terrible
as they were all the
same length and third
could be basically
broken with the
second...
Playfair i=j, so that confuses bottom row is very basically “stolen” by a
frequency analysis to predictable guy named Lord
a degree Playfair
frequency analysis of
digraphs could help used in Boer war and
decode it WW1
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