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+# Crypto
+
+## Overview:
+Why do we need crypto?
+
+- Confidentiality
+- Key Ex
+- Identity
+- Authentication
+
+## Asymetric Cryto
+- Symmetric crypto faster, asymmetric slower and computational expensive
+- RSA
+    - slightly old
+    - Needs 2048+ size keys
+
+## eliptic curve crypto
+- Dot function
+- Key exchange with shared key created from a -> aG -> aGb <- bG <- b
+- Week to man in the middle
+
+## Web of trust
+- How can we safely pass the key over an unsecured channel
+- Just blindly trust on first use (like ssh)
+
+## The trusted third party
+- Get a 3rd actor to meet Alice and Bob to add trust
+
+## hash functions
+- md5 weak
+- sha good
+
+# Merkel tree
+- Hash chunks
+- Combine chunks and hash
+- Can work out which parts are wrong
+- good for static data
+- hash tree
+
+## BLock chain
+- Use block chain to share trusted messages
+
+@giveupalready
+https://github.com/carnage
+
+
+
+
+
+--------
+Web of trust, trust once, trust forever