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| | CPU Adventure – Unknown CPU Reversing (robertxiao.ca) | | 1 point by markus_zhang on March 18, 2023 | past | |
| | Doublethink – 8-Architecture Assembly Polyglot (robertxiao.ca) | | 2 points by markus_zhang on Nov 8, 2022 | past | |
| | Solving the 5-Part SSTIC Challenge (robertxiao.ca) | | 1 point by nneonneo on June 15, 2021 | past | |
| | Cryptanalysis of the Sarah2 Pen-and-Paper Cipher (robertxiao.ca) | | 2 points by m_eiman on Jan 15, 2020 | past | |
| | Cryptanalysis of the Sarah2 Pen-and-Paper Cipher (robertxiao.ca) | | 2 points by gerikson on Jan 14, 2020 | past | |
| | Cryptanalysis of the Sarah2 Pen-and-Paper Cipher (robertxiao.ca) | | 1 point by nneonneo on Jan 12, 2020 | past | |
| | Reverse engineering a custom CPU from a single program (robertxiao.ca) | | 339 points by nneonneo on Sept 25, 2019 | past | 47 comments | |
| | Doublethink – 8-Architecture Assembly Polyglot (robertxiao.ca) | | 2 points by matt_d on Aug 19, 2018 | past | |
| | QR Code Recovery (robertxiao.ca) | | 1 point by sandebert on May 21, 2018 | past | |
| | LocationSmart API Vulnerability (robertxiao.ca) | | 4 points by imjustsaying on May 17, 2018 | past | |
| | LocationSmart Leaked Location Data for All Major U.S. Carriers in Real Time (robertxiao.ca) | | 1209 points by uptown on May 17, 2018 | past | 270 comments | |
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