2017 34C3 CTF writeup
| Name | Category | Points | Solves |
|---|---|---|---|
| lol | CRYPTO | 233 / 500 | 16 |
I bet you can’t crack this great encryption that I invented.
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| miner | CRYPTO | 451 / 500 | 3 |
Hi, NSA here, again. Our suspects have changed some details in their protocol (see “white_russian”). We also need their second flag.
Connect: nc 35.198.134.252 2024
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| rofl | CRYPTO | 290 / 500 | 11 |
Please try again.
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| SES | CRYPTO | 253 / 500 | 14 |
Do you sometimes feel like modern crypto is just too complicated to be useful?
You want a simple cipher that simple people like you can understand?
Then Simple Encryption Standard might be just what you are looking for! We ripped out the uselessly complicated stuff and replaced it with that warm fuzzy feeling of understanding once again.
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| software_update | CRYPTO | 182 / 500 | 23 |
Always remember to keep your router firmware up to date!
Connect: telnet 35.198.64.68 2023
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| white_russian | CRYPTO | 338 / 500 | 8 |
Hi, NSA here. We’re doing surveillance on monitoring two innocent citizens suspected terrorists. We’ve seen them using pratically every cryptographic scheme you can think of. They’re using some fancy new instant messaging thing. We have their public keys and the messages they sent to each other. We need their flag by Dec 29th, 2017, 20:00 UTC!
Connect: nc 35.198.143.105 2024
See attachments.
See solutions.
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