Implementation
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Use newer generation GPUs and CUDA
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More blockmodes (CTR if possible), RC5 (http://www.openssl.org/docs/apps/enc.html)
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Streams and multi-GPU using CUDA 4
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Have a look at parallel execution again
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kgpu (GPU framework for Linux kernel)
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SSLShader (reverse SSL proxy with GPU support)
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libgpucrypto (CUDA library from the SSLShader guys)
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Disk encryption software
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eCryptfs (crypto-filesystem)
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LUKS / dm-crypt / cryptoloop / Truecrypt (full-disk encryption)
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Comparison here: http://ecryptfs.sourceforge.net/ecryptfs-faq.html#compare
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Block modes
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