diff --git a/content/Etudiants/zz2-f5-privacy.md b/content/Etudiants/zz2-f5-privacy.md
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+++ b/content/Etudiants/zz2-f5-privacy.md
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+Title: ZZ2 F5 Privacy
+Date: 2018-02-16 10:55
+Category: <i class='fa fa-graduation-cap' aria-hidden='true'></i> Étudiants
+Tags: cours
+
+* [je n'ai rien à cacher](slides/privacy/jnarac.html)
+* [mots de passes](slides/privacy/passwords.html)
+* [tracking](slides/privacy/tracking.html)
+* [souveraineté](slides/privacy/sovereignty.html)
+* [tails](slides/privacy/tails.html)
+* [crypto](slides/privacy/crypto.html)
+* [tls](slides/privacy/tls.html)
+* [pgp](slides/privacy/pgp.html)
+* [tor](slides/privacy/tor.html)
+* [bitcoin](slides/privacy/bitcoin.html)
diff --git a/content/slides/privacy/bitcoin.html b/content/slides/privacy/bitcoin.html
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diff --git a/content/slides/privacy/md/bitcoin.md b/content/slides/privacy/md/bitcoin.md
index 2d1fa9423e2450613c199d5eaeeedf0261ec0b41..712aef011705d089613b26af682433a4ae959c27 100644
--- a/content/slides/privacy/md/bitcoin.md
+++ b/content/slides/privacy/md/bitcoin.md
@@ -3,109 +3,261 @@
# <i class="fa fa-btc" aria-hidden="true"></i>
-## White Paper
+## [Bitcoin](https://bitcoin.fr/bitcoin-explique-par-son-inventeur/)
-* https://bitcoin.org/bitcoin.pdf
-* http://nakamotoinstitute.org/bitcoin/
-* https://bitcoin.fr/bitcoin-explique-par-son-inventeur/
+* Satoshi Nakamoto (2009)
+ * [Bitcoin White Paper](https://bitcoin.fr/bitcoin-explique-par-son-inventeur/)
+ * Monnaie électronique
+ * Dématérialisée
+ * Finie
+ * Entièrement pair à pair (P2P)
+ * Résout le problème de la double dépense
-* 1 cryptomonnaie = 1 White Paper
- * un résumé
- * les problèmes traités
- * la façon de les résoudre
- * éventuellement 1 Yellow paper
- * plus orienté recherche
-* https://www.quora.com/Whats-the-difference-between-a-white-paper-and-a-yellow-paper
+## Bitcoin White Paper
+* **Objectif** se passer d'une institution bancaire
+ * solution décentralisée
+* **Solution partielle**
+ * système de clés publiques / privées (RSA)
+* **Problème à résoudre** la double dépense
+ * réseau P2P
+ * transactions horodatées, chainées entre elles
+ * la chaîne la plus longue est la chaîne nécessitant le plus de calcul à falsifier
-## Bitcoin
-* Monnaie électronique
- * dématérialisée
+## Institution financière
-* entièrement pair à pair (P2P)
+* Tiers de confiance
+ * fait la loi dans les transactions
-* principal problème: la double dépense
+* Interdit les transactions réellement irréversibles
+ * les banques jouent le rôle de médiateur
-## Bitcoins
+* Le coût de cette médiation est répercutée sur les frais bancaires
+ * rend les transactions à faible montant chères
-* Satoshi Nakamoto (2009)
-* Toutes les transactions sont publiques
-* Une adresse est le hash d'une clé publique
-* Il faut signer une transaction avec la (les) clé(s) privée(s) associée(s) aux adresses de dépense
-* Validation des transactions toutes les 10 minutes
-* [Tout ce que vous avez toujours voulu savoir sur Bitcoin](https://lopp.net/bitcoin.html)
+## Non réversibilité
-* l'argent est créé différemment
- * création finie à 2100000BTC
-* pas de banque
-* le cluster est couteux éngergétiquement
-* transparent
- * grand livre ouvert de transactions publiques (hash)
- * une clé = un billet
- * comme si on pouvait prendre les empreintes digitales de tous ceux qui l'ont eu, datés.
- on coupe toujours les billets et y a toujours de la monnaie
-* pour l'utillisateur c'est du cash!
- * gérer par une wallet
+* Si la non réversibilité n'existe pas
+ * les vendeurs cherchent à en savoir plus sur leurs clients pour instaurer la confiance
+* Le cash règle ce problème
+ * mais n'a pas d'équivalent sur un système de télécommuncation
+ * <i class="fa fa-hand-o-right" aria-hidden="true"></i> sans autorité centrale
-## Bitcoin White Paper
-* objectif: se passer d'une institution bancaire
-* solution partielle: les signatures numériques
-* problème à résoudre: la double dépense
- * réseau P2P
- * transactions horodatées chainées entre elles
- * la chaîne la plus longue est la chaîne nécessitant le plus de calcul à falsifier
+## Preuve cryptographique
+* Remplace le tiers de confiance
+* Les Transactions
+ * directes
+ * irréversibles
+ * protège le vendeur
+ * compte séquestre pour protégér les acheteurs
+ * **escrow** internmédiaire pour faire respecter un contrat entre les partis
+ * paiement après réception par exemple
+ * gère les litiges
-## Institution financière
-* tiers de confiance
- * fait la loi dasn les transactions
+## Solution proposée
-* interdit les transactions réellement irréversible
- * les banques jouent le rôle de médiation
+* Génération d'une preuve calculée de l'ordonnancement des transactions
+* Utilisation d'un serveur d'horodatage P2P
+ * distribué sur des noeuds (mineurs)
+ * résolvant le problème de la double dépense
-* le cout de cette médiation est répercutée sur les frais bancaires
- * rend les transactions à faible montant chère
-* les vendeurs cherchent à en s'assurer de "l'existence" de leurs clients
+## Transactions
+* une pièce électronique (*coin*)
+ * est une chaîne de signature
+* le propriétaire ajoute de la *coin*
+ * signature de la transaction précédente
+ * clé publique du nouveau propriétaire
+* les transactions sont vérifiables par tous
-## Preuve cryptographique
-* remplace le tiers de confiance.
-* transactions
- * directes
- * irréversibles
-* protège le vendeur
-* un intermédiaire escrow peut protéger le vendeurs
-* Une preuve calculée de l'ordonancement des blocs utilisant un serveur d'horodatage P2P
- * résout le problème de la double dépenses
+## Transactions
+
-## Transactions
-* une pièce électronique (coin)
- * est une chaine de signature
+## Double dépense
-
+* Comment savoir si le propriétaire n'a pas dépensé la coin 2 fois?
+ * sans jouer le rôle d'hôtel de la monnaie
+ * tout passe par lui
+ * seul l'argent qui provient de lui n'est pas dépensé 2 fois
+ * solution centralisée
-## Buy some
-* controle d'identité
- * carte d'identité
- * passeport
- * webcam
- * selfie
-* cubtis
-* coinebase
-* poloniex
+## Solution proposée
+
+* Tout l'historique des transactions sur chaque coin est publique
+ * vérifiable
+ * distribué
+ * consensus pour la version de l'historique à adopter
+
+
+## Serveur d'horodatage
+
+* *hash* un ensemble d'élément (bloc)
+* publication horodaté de ce *hash*
+ * ce bloc a existé!
+ * avec le *hash* du bloc horodaté précédent
+
+* C'est une chaîne publique de blocs
+
+
+## Serveur d'horodatage
+
+
+
+
+## Preuve de Travail / POW
+
+* Challenge
+ ```bash
+ sha256(X) = 00000004bb4bec2b98.. (32 bytes en hexa soit 64 caractères)
+ ```
+
+ * le travail requis croît exponentiellement
+ * *f(nombre de 0)*
+ * validation simple(un calcul d'empreinte)
+
+
+## Preuve de Travail / POW
+
+* Il faut refaire le travail pour modifier ce bloc
+ * les blocs sont chainés
+ * plus un bloc est vieux plus il est coûteux à espérer modifier
+ * la sécurité de la chaîne repose sur ce principe
+
+
+
+
+## Preuve de Travail / POW
+
+* Se substitue au vote
+ * repose sur la puissance de calcul
+* La chaîne la plus longue détient la "vérité"
+ * celle qui a nécessité le plus de calcul
+* Tant que la majorité de la puissance de calcul est entre les mains de personnes honnêtes
+ * les échanges sont sécurisés
+
+
+## Preuve de Travail / POW
+
+* Difficulté (nombre de 0) ajustée automatiquement
+ * objectif de N blocs à trouver par heure en moyenne
+ * régule
+ * les évolutions de puissance des machines
+ * la fluctuation des noeuds de calcul
+ * le flux des transactions
+
+
+## Réseau
+
+* Envoie des transactions par les utilisateurs
+* Chaque noeud regroupe les nouvelles transactions dans un bloc
+* Chaque noeud travaille à la résolution de la preuve de travail sur son bloc
+ * broadcast de la preuve de travail quand elle est trouvée
+
+
+## Réseau
+
+* Les noeuds vérifient le bloc pour l'accepter
+ * la preuve de travail
+ * que toutes les transactions du bloc sont valides
+ * que toutes les transactions du bloc n’ont pas déjà été dépensées
+* Accepter un bloc signifie que le noeud travail sur le bloc suivant
+ * <i class="fa fa-hand-o-right" aria-hidden="true"></i> le hash du bloc qui vient d'être validé sera utilisé pour ce nouveau bloc
+
+
+## Incitation
+
+* La puissance de calcul mise à disposition pour le développement de la chaîne de blocs est récompensée
+* La première transaction d'un bloc est une récompense
+ * pas d'émetteur
+ * le bénéficiaire est le créateur du bloc
+ * cela correspond au inage **mining**
+* Création monétaire du système
+
+
+## Incitation
+
+* Contribution des utilisateurs (**fees**)
+ * le montant en entrée est plus grand que celui de sortie?
+ * la différence est pour le noeud
+ * le devenir du système un fois toutes les pièces émises
+
+
+## SPV
+
+Vérification de Paiement Simplifié
+
+(**Simplified Payment Verification**)
+
+* Le simple utilisateur (wallet) n'a pas besoin de tous les blocs pour créer une nouvelle transaction
+ * il peut conserver les derniers blocs de la chaîne la plus longue
+ * en interrogeant plusieurs noeuds
+
+* Il lie sa transaction au bloc courant afin de l'horodaté
+
+
+## Combinaison et Fractionnement de Valeur
+
+* Une grosse entrée ou multiples petites entrées
+* Une sortie bénéficiaire et éventuellement une sortie pour récupérer la monnaie
+* L'historique complet de chaque transaction est inutile
+
+
+## Combinaison et Fractionnement de Valeur
+
+
+
+
+## Confidentialité
+
+* Les clés publiques utilisées pour les transactions sont anonymes
+ * les échanges se font entre possesseur des clés
+ * on peut générer de nouvelles clés bénéficiaires pour chaque transaction
+
+
+## Confidentialité
+
+* L'anonymat
+ * est levé lors du change en € ou en $
+ * les entrées d'une transaction sont contrôlées par la clé en entrée de la transaction
+
+* Lever l'anonymat d'une clé permet de faire parler toutes les transactions associées
+
+
+## En Pratique
+
+* L'argent est créé différemment
+ * création finie à 2100000BTC
+* Pas de banque
+* Le cluster est coûteux éngergétiquement
+
+
+## En Pratique
+
+* Transparent
+ * grand livre ouvert de transactions publiques
+ * une clé = un billet
+ * comme si on pouvait prendre les empreintes digitales de tous ceux qui l'ont eu, datés.
+ on coupe toujours les billets et il y a toujours de la monnaie
+
+
+## En Pratique
+
+* Pour l'utillisateur c'est du cash!
+ * gérer par une wallet
+* [Tout ce que vous avez toujours voulu savoir sur Bitcoin](https://lopp.net/bitcoin.html)
----
## clean (mixers, atomic swaps, trading?)
@@ -113,74 +265,56 @@
* on perd le lien aux clés qu'on a
* on a aucune garanti sur celles que l'on obtient
* machine à lavers
-* atomic swap
- * écriture sur deux blockains de deux monnaies
----
-## escrow
+## Calculer ses fees
-* tiers de confiance
- * procédure de litiges
- * valider la reception
+* Chaque transaction est plus ou moins complexede
+ * plusieurs payeurs
+ * plusieurs destinataires
+* les fees sont fonctions de la complexité de la transaction
+ * le mineur intelligent choisit en priorité les transactions au meillleur ratio fee/complexité
+ * l'utilisateur maximise ses chances d'avoir sa transaction prise en compte rapidement en augmentant les fees
----
-# POUR DE VRAI
+## Calculer ses fees
-
+* Taille transaction = nb_input*148 + nb_output*34 + 10
----
+* transaction simple = 226 bytes
-## Tor over VPN
+* [Predicting Bitcoin fees for transactions](https://bitcoinfees.earn.com/)
-* protection vis a vis du provider
-* [AWS](https://aws.amazon.com/fr/)
- * CB valide & soldable
- * [autovpn](https://github.com/ttlequals0/autovpn) -p 443
- * [tout en 1](https://gist.github.com/themouette/892af1bc8295637cdd20603765713342)
-* services / serveur dédiés
- * [payables en bitcoins?](https://www.bestvpn.com/best-vpn-bitcoin/)
+* [Bitcoin Fee Estimation](https://estimatefee.com/)
----
-## [TAILS](https://tails.boum.org/index.fr.html)
+## Calculer ses impôts
-* E. Snowden
-* Tails ne s'installe pas sur votre machine
- * [mais sur une clé USB)(https://tails.boum.org/install/os/index.fr.html)
- * système live
- * [suite logicielle complète](https://tails.boum.org/doc/about/features/)
- * persistance chiffrée sur la clé USB
- * sécurité des vos données
- * importation facilitée
- * bien sauvegarder cette partition
+[Impôts & bitcoin : comment bien déclarer ses cryptomonnaies, notre guide en 10 questions](https://www.numerama.com/business/325205-impots-bitcoin-comment-bien-declarer-ses-cryptomonnaies-notre-guide-en-10-questions.html)
----
-## Netographie
-* privacy
- * https://prism-break.org
-* tor
- * https://www.torproject.org/docs/tor-hidden-service.html.en
- * http://www.bortzmeyer.org/blog-tor-onion.html
- * https://benjamin.sonntag.fr/Tor-les-onion-le-darknet-a-votre-portee
- * https://www.torproject.org/docs/hidden-services.html.en
- * https://donncha.is/2013/05/trawling-tor-hidden-services/
+## le monde fou fou fou des cryptomonnaies
-* bitcoin
- * https://lopp.net/bitcoin.html
- * https://www.blockcypher.com/dev/intro/
----
-3.1 transactions, fees, blocks
+## White Paper
-* transactions signée à la pgp entre débiteur et bénéficiare
-* des mineurs résolvent un challenge cryptographique de plus en plus complexe
- * quand ils le trouvent, ils empochent un montant de bitcoins (de plus en plus faible ans le temps)
- * ils optiennent le droit de valider le bloc
- * ils empochent également les fees
- * de plus en plus chers
-* le système repose sur la crypto pour
- * la confiance
- * la validation des transactions
+* 1 cryptomonnaie = 1 White Paper
+ * un résumé
+ * les problèmes traités
+ * la façon de les résoudre
+ * éventuellement 1 Yellow paper
+ * plus orienté recherche
+
+* [What's the difference between a white paper and a yellow paper](https://www.quora.com/Whats-the-difference-between-a-white-paper-and-a-yellow-paper)
+
+
+## Buy some
+
+* controle d'identité
+ * carte d'identité
+ * passeport
+ * webcam
+ * selfie
+* cubtis
+* coinbase
+* poloniex