Decryption-decompression of AES protected ZIP files on GPUs

Tan Nhat Duong, Phong Hong Pham, Duc Huu Nguyen, Thuy Thanh Nguyen, Hung Duc Le
Hanoi Univ. of Technology (Viet Nam)
Proc. SPIE 8285, 828568, 2011


   title={Decryption-decompression of AES protected ZIP files on GPUs},

   author={Duong, T.N. and Pham, P.H. and Nguyen, D.H. and Nguyen, T.T. and Le, H.D.},

   booktitle={Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series},





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AES is a strong encryption system, so decryption-decompression of AES encrypted ZIP files requires very large computing power and techniques of reducing the password space. This makes implementations of techniques on common computing system not practical. In [1], we reduced the original very large password search space to a much smaller one which surely containing the correct password. Based on reduced set of passwords, in this paper, we parallel decryption, decompression and plain text recognition for encrypted ZIP files by using CUDA computing technology on graphics cards GeForce GTX295 of NVIDIA, to find out the correct password. The experimental results have shown that the speed of decrypting, decompressing, recognizing plain text and finding out the original password increases about from 45 to 180 times (depends on the number of GPUs) compared to sequential execution on the Intel Core 2 Quad Q8400 2.66 GHz. These results have demonstrated the potential applicability of GPUs in this cryptanalysis field.
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