Mail/Cryptography

>Other useful stuff
mail
https://lavabit.com/ -- security mail with top notch encryption
http://www.guerillamail.org/ -- disposable mail
http://10minutemail.com/
http://10minutemail.net/

cryptography
https://competitions.cr.yp.to/ -- crypto competitions, useful
https://www.cosic.esat.kuleuven.be/nessie/ -- nessie documents, also useful
http://www.cryptrec.go.jp/english/report.html -- cryptrec reports, mostly in Japanese, some in English
https://trailofbits.github.io/ctf/index.html
http://www.tandfonline.com/toc/ucry20/current -- Cryptologia, A quarterly journal devoted to all aspects of cryptology
https://blog.pinboard.in/2013/04/the_matasano_crypto_challenges/ -- challenges
http://cryptopals.com/ -- challenges
http://www.und.edu/org/crypto/crypto/lanaki.crypt.class/ -- cryptography course with challenges
https://pqcrypto.org/

http://www.qubit.org/ -- Centre for Quantum Computation
http://isg.rhbnc.ac.uk/ -- Information Security Group, Royal Holloway College