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highest encryption strength for free?


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What is the program with the best encryption strength for a free program. I have some data that needs securing. I was thinking of a password protected algorithem that is a good algorithem and between 512 and 1024bit for the key.

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Anything based on RC4 or its variants can use variable key sizes, up to 2048 bits for RC4.
RC4 has some weaknesses.
Blowfish - fast and secure if you have a 128-bit key.

128-bit: minimum.

Check 7-ZIP: Rijndael algorithm, 256-bit key, 256K hashes with SHA256.

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