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# Crypto
Christopher Riley
@giveupalready
https://github.com/carnage
## Overview:
Why do we need crypto?
- Confidentiality
- Key Ex
- Identity
- Authentication
## Asymmetric Crypto
- Symmetric crypto faster, asymmetric slower and computational expensive
- RSA
- slightly old
- Needs 2048+ size keys
## Elliptic 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
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Web of trust, trust once, trust forever
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