I will travel a lot in the next time and have to take a relatively large amount of data (100M -5 G) with me on harddisks and CD/DVDs.
I therefore need a encryption sofware which
1. can encrypt large amount of data (100M - 5G) relatively quickly
2. is free
3. is very secure sothat hackers would have a hard time if they intend to crack the encrypted data. A reference on any comparative report with respect to the security of encryption softwares would be appreciated.