Where did you learn about security/attacks?
yan: Pentesting/security analysis has been my hobby in high school/early college and I ended up getting BS and MS degrees in CS, with concentration in security. It's also my day job.It's unclear what exactly you want to concentrate on. Do you want to learn about encryption algorithm details and want to understand the design decisions behind them or do you just want to effectively use them? Do you want to learn about proper architecture and general principles?edit: feel free to contact me if you have any specific questions, I'll try my best to weigh in on specific issues.