privacy, secrecy, brevity, speed ciphers & shorthands demystified © 2012 nick pelling –...
TRANSCRIPT
Privacy, Secrecy, Brevity, Speed
Ciphers & Shorthands Demystified
© 2012 Nick Pelling – [email protected]
http://www.ciphermysteries.com/
What should you get from this?
• The confidence and ability to:– see a cipher or shorthand for what it is– work with and transcribe modified writing – know the limits of what you’re doing– not be fooled!
The four -graphies
• Crypto- = ‘hidden’
• Stegano- = ‘concealed’
• Steno- = ‘abbreviated’
• Tachy- = ‘speedy’
However… they overlap & conflict.
What to expect from this talk…
Brevity[Stenography]
Speed[ Tachygraphy ]
Privacy[Cryptography]
Secrecy[Steganography]
Part 1
Part 2
Part 3: Transcribing modified texts
Part 4: Some real examples
It’s a complex endeavour!
Cryptography
Cryptology
Cryptanalysis
Test results
Hypotheses
Speculations
HistoricalImagination
HistoricalAnalysis
Observations
Transcriptions
“Stuck in the middle with you”
Misunderstoodmysteries
Self-constructedmethodologies
Self-appointedcode-breaker hero
Appropriatedmysteries
Imaginarymethodologies
Clichédcryptographers
?
?
?
CipherNovelists
CipherTheorists
Privacy vs Secrecy
• Sex with your partner is private
• Sex with your tennis partner is secret
Or, somewhat more cryptographically…
• Private = we can see it but we can’t read it
• Secret = we can’t even see it to read it
Privacy
• Nerds
• GCHQ
• Mathematics
• Permutation
• Substitution
• Brains / Intellect
• Cryptography
• Transformation
Secrecy
• Spies
• MI6 / James Bond
• Disguise
• Psychology
• Transposition
• Visuospatiality
• Steganography
• Deception
Mapping Privacy & Secrecy
Alberticipher wheel
Trithemiuscipher square
Vigenereautokey
CardanGrille Nulls
Pigpen
Homophoniccipher
Monoalphabeticsubstitution
Numbercipher Verbose
cipher
Francis Baconbilterary cipher
Twin-letterreplacement
NomenclatorAnagram
cipher
Private
Plain
TransparentSecret
[The VoynichManuscript!]
TrithemiusDemonic messages
CardanGrille
So many cipher techniques!
Yes… but it’s not actually a problem for us.
Almost all clever cipher tricks never escaped from crypto theoreticians’ textbooks.
Just about every pre-1800 cipher you’re likely to see follows one basic pattern…
The Basic Cipher Key
A simple format that was used for centuries!
• Letter Key (“homophonic” if >1 per letter)
• Gemine (to replace doubled letters)
• Nulle (nonsense letters)
• Nomenclatura (to replace groups / words)
• …plus any special tricks or hacks!
1450
Milan
Handout: cipher history stuff!
Brevity vs Speed
Two specific lacks:-
• If you lack writing space, you need Brevity
• If you lack writing time, you need Speed
Brevity
• Medium-independent
• Abbreviation– Contraction– Truncation– Acronyms– Scribal traditions
• Symbol Dictionaries
• Logical “conlangs”
Speed
• Medium-dependent
• Designed systems
• Easy to use
• Stroke-based
• (Modern phonetic)
Mapping Brevity & Speed
SlowFast
Verbose
ConciseTironianNotae
MorseCode
Mr Ratcliff'sabbreviations
Shelton'ssystem
GabelsbergerSystem
Abjad
Text
Local scribalabbreviations
PitmanPhonetic
(Greektachygraphy )
Bright'sCharacterie
Rich'sshorthand
Modern shorthand structure
• Letter key – one rapid stroke per letter
• Trick for writing vowels at speed– Very short variant stroke– Discarding them completely (“abjad”)– Direction (relative to word’s initial letter)
• Optional: logical word construction
• Optional: many extra shapes (‘arbitraries’)
Bright’s Characterie (1588)
Shorthand comparison to 1750
• Isaac Pitman (1884) History of Shorthand, pp.129-131
Jeremiah Rich’s arbitraries…
…and hundreds more!
Getting Started
• How old is it?– If pre-1600, it’s almost certainly a cipher.
• If it’s all numbers, is each less than 100?– If yes, probably a number cipher: else a code.
• Is it clearly designed for rapid writing?– If yes, probably a modern shorthand.
• How many different shapes (approx)?– If 25 or less, very likely to be a simple cipher.
Common Transcription Pitfalls
Things to remember at all times:
• The text might be miscopied (especially if printed)• The ink might have faded• Later owners might have tried to restore it• Later owners’ marks might be misinterpreted as original• Beware wear, stains, rips, tears, contact transfers, etc• Bifolios might have been shuffled or reversed
Key question: what happened to it to leave it this way?
Useful Transcription Tips
• Patiently build up your own symbol key
• Look for ASCII similarities to keep it quick
• Transcribe shape variants defensively
• Don’t be tricked, particularly by punctuation
• Transcribe 25% well, not 100% badly!
Note: this always takes longer than you think!
Now… some real examples!
1. A celebrity!
• What is it? What happened?
2. Another writer!
• What is it? What happened?
3. Ludovico Spoletani (who he?)
• What is it? What happened?
4. The Anthon Transcript
• What is it? What happened?
5. The Outer Limits…
• What is it? What happened?
Thank you for your attention!
Any questions?
© 2012 Nick Pelling – [email protected]
http://www.ciphermysteries.com/