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Trusted execution environment for ARM-based computers, based on
https://en.wikipedia.org/wiki/Xv6

JEROME H. SALTZER, SENIOR MEMBER, IEEE, AND
MICHAEL D. SCHROEDER, MEMBER, IEEE
Invited Paper

Manuscript received October 11, 1974; revised April 17. 1975. Copyright © 1975 by J. H. Saltzer.
The authors are with Project MAC and the Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology Cambridge, Mass. 02139.

Abstract - This tutorial paper explores the mechanics of protecting computer-stored information from unauthorized use or modification. It concentrates on those architectural structures--whether hardware or software--that are necessary to support information protection. The paper develops in three main sections. Section I describes desired functions, design principles, and examples of elementary protection and authentication mechanisms. Any reader familiar with computers should find the first section to be reasonably accessible. Section II requires some familiarity with descriptor-based computer architecture. It examines in depth the principles of modern protection architectures and the relation between capability systems and access control list systems, and ends with a brief analysis of protected subsystems and protected objects. The reader who is dismayed by either the prerequisites or the level of detail in the second section may wish to skip to Section III, which reviews the state of the art and current research projects and provides suggestions for further reading.

Just what it says.

A highly secure, comprehensive, easy-to-use replacement
for usernames, passwords, reminders, one-time-code
authenticators . . . and everything else.
The site contains other interesting things such as a TrueCrypt repository, password generators and other tools and information about the PDP-8.

Secure text messages for Android and iOS.

Browser-based end-to-end encryption for e-mail.

eCryptfs is a POSIX-compliant enterprise cryptographic stacked filesystem for Linux. eCryptfs stores cryptographic metadata in the header of each file, so that encrypted files can be copied between hosts; the file will be decrypted with the proper key in the Linux kernel keyring. There is no need to keep track of any additional information aside from what is already in the encrypted file itself. You may think of eCryptfs as a sort of "gnupg as a filesystem".

Tomb is an 100% free and open source system for file encryption on Linux, facilitating the backup of secret files. Tomb is written in code that is easy to review and links commonly shared components.

Tomb generates encrypted storage folders to be opened and closed using their associated keyfiles, which are also protected with a password chosen by the user.

A tomb is like a locked folder that can be safely transported and hidden in a filesystem; its keys can be kept separate, for instance keeping the tomb file on your computer harddisk and the key files on a USB stick.

Tomb is a simple tool to manage encrypted storage on GNU/Linux, from the hashes of the dyne:bolic nesting mechanism.

Hardware TRNG with USB interface, $25.