2021 ASIS CTF Quals writeup
| Name | Category | Points | Solves |
|---|---|---|---|
| Crypto Warm up | CRYPTO | 41 / 500 | 147 |
Recovering secrets is hard, but there are always some easy parts to do it!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Spiritual | CRYPTO | 79 / 500 | 60 |
The meaning of spirituality has developed and expanded over time, but what does it mean here?
nc 168.119.108.148 13010
None.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Pinhole | CRYPTO | 134 / 500 | 31 |
Pinholes sometimes automatically closed after a period of time to minimize the security exposure. What about this pinhole?
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Madras | CRYPTO | 59 / 500 | 88 |
Madras is a great place to learn the occult! The occult, is a category of supernatural beliefs and practices which generally fall outside the scope of religion and science. Do you want to go Madras?
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Madras | CRYPTO | 201 / 500 | 18 |
Broken crypto systems are lagleg, try to break it again!
Note: There is tiny typo in the source code Lagleg.py, change 512 to 256 in the 53rd line.
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Damas | CRYPTO | 477 / 500 | 1 |
The probabilistic problem related with matrices, improved and maybe strong! Try to break it!
Note: In the 22nd line of the DamaS.sage there is typo, change N to phi.
See attachments.
See solutions.
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