What's the strongest encryption algorithm available today?

I need to know the most SECURE encryption algorithm and key size. Speed doesn't matter. Could you give me an example + a (free) program that can accomplish encryption/decryption with that algorithm? I have heard about Rijndael, but as far as I have read, it is technically not the most secure one available... show more I need to know the most SECURE encryption algorithm and key size. Speed doesn't matter.
Could you give me an example + a (free) program that can accomplish encryption/decryption with that algorithm?

I have heard about Rijndael, but as far as I have read, it is technically not the most secure one available - just a balance between security and speed.

Any ideas + programs? Thanks very much !
Update: I don't need disk encryption software, I would like to know about file/folder encryption software. Thanks :)
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