Looking for a secure but usuable linux distro

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http://unix.stackexchange.com – I have decided to try out the Linux world! I have read through a bunch of articles on some Linux distributions which were very informative but I was hoping someone here can suggest a distro for me based on some features that are a priority for me. They are: OS is secure (all non-essential services turned off/not installed). OS can be booted from USB. OS can save changes/files onto that USB. OS is updated frequently (security patches/etc). Can browse web and watch flash videos. Has support for multiple monitors. Has encryption tools to encrypt files (PGP/etc) Thank you (HowTos)