Hi
My name is Suresh and i have 4 years of experience of testing in the avionics domain and now i would like to change my interest towards security in the below practices
Application Security,
Information Security
Risk Management
Security Architecture and Design
but am not sure from where to start to enter into this field, i would be more happy:D if any one of you provide a solution so that i can concentrate and walk towards my interests

thanks in advance:)
-suresh