0414 VPN & Blockchain learning summary

VPN is like a submarine compared public boat with privacy and security of data.And the scalability of VPN is much greater than leased line since the distance of location matters a little for creation of VPN.

Data confidentiality probably is the most important function provided by VPN.

IPsec: Internet Protocol Security Protocol,there are two modes of IPsec: tunnel and transport, tunnel mode provide sencryption of header and payload of data where transparent only encrypts payload. This service require system-complaint so can take advantage of it.

Vital: if you say that something is vital,it is very important and necessary.

Attain: if you attain something, you reachit, either by a lot of effort or natural development.

Thereare some third-party software that provides connection and security, IPsec

supports 56-bit (single DES) and 168-bit (three DES)

====================================================================

Dive: if you dive, you jump in waters headfirst with arms held straight above your head.

Cryptocurrency is probably is the most visible operations of a blockchain.

It is an economic proxy and the most viableoperations of the blockchain.

Proxy: let someone or something else do itfor you.

Viable: if you describe something isviable, it exactly does what it is intended to do.

One of the challenge for cryptocurrency is its volatility, and it is due to genuine uncertainty. If blockchain gets more acceptance and understanding, the price volatility will be less.

Volatile: something changes suddenly andunexpectedly.

Genuine: if you describe something isgenuine, it is exactly what it is.