Galois Extended Mode (GEM) is a block cipher mode similar to Galois/Counter Mode but with the following enhancements:

• Nonces are now longer than 96-bit. AES-256-GEM uses 256-bit nonces, while AES-128-GEM uses 192-bit nonces. Consequently, you can use AES-GEM to encrypt a virtually unlimited number of messages under the same key.
• The maximum length for an encrypted message is about 2 exabytes (2^61 bytes), rather than about 64 gigabytes (2^36 - 32 bytes).
• The weaknesses with truncated GCM tags have been addressed at the cost of one additional AES encrypt operation.

GEM achieves this with minimal overhead.

I don't know if this is a good idea or not, I don't even know if anybody's reviewed it yet. But, just in case it seems smart to keep a link handy.

In the spirit of Feynman's immortal words, the goal of this project is to better understand the internals of databases by implementing a relational database management system (RDBMS) (sqlite clone) from scratch.

This project was motivated by a desire to: 1) understand databases more deeply and 2) work on a fun project. These dual goals led to a:

• relatively simple code base
• relatively complete RDBMS implementation
• written in pure python
  • No build step
• zero configuration
  • configuration can be overridden

This makes the learndb codebase great for tinkering with. But the product has some key limitations that means it shouldn't be used as an actual storage solution.

Advanced Mac Substitute is an API-level reimplementation of classic Mac OS. It runs 68K Mac applications in an emulator without an Apple ROM or system software. Unlike traditional emulators, Advanced Mac Substitute doesn’t emulate the hardware on which an operating system runs (except for the 680x0 processor), but actually replaces the OS — so it launches directly into an application, without a startup phase.