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Overview
Hello! I’m Erik Davis, and welcome to my little piece of the internet. Professionally, I’m a mathematician turned software engineer. These days I work at the AWS Center for Quantum Computing on software supporting the experimental effort.
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One-time pad and perfect secrecy
The one-time pad is one of the simplest and well known secure encryption schemes. Suppose we have a message (m), which is a sequence of (L) bits. The idea of the one-time pad is to take an additional (L) bits selected at random, called the key, and then c
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Avoiding loops with BGP
Last time I motivated BGP in the context of inter-domain routing. This time, I'd like to describe a bit about how BGP operates. A basic requirement of any routing protocol is that it cope with routing loops. Recall that under the model of destination-base
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Why BGP?
The internet got its name from the fact that it is a "network of networks". Various businesses, universities, and government entities developed networks but had to coordinate in order to communicate across these. The challenges here are more than just tec
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RFC 1180: A TCP/IP Tutorial
There are several types of IETF RFCs, including strict standards, looser "best common practices", as well as purely informational documents. Today we'll look at RFC 1180, a tutorial on how TCP/IP typically worked as of 1991 (when this document was written
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A few factoids about IPv6 datagrams
A few weeks ago I went through RFC 791, which was the original IPv4 specification. I thought it could be interesting to follow up on this by looking at RFC 8200 which is the latest specification for IPv6. The primary rationale for IPv6 is to go beyond the
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