2022 Crypto CTF writeup
| Name | Category | Points | Solves |
|---|---|---|---|
| Klamkin | CRYPTO (EASY) | 61 / 500 | 83 |
We need to have a correct solution!
nc 04.cr.yp.toc.tf 13777
None.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Baphomet | CRYPTO (EASY) | 56 / 500 | 93 |
Decrypt the message in traditional way!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| SOTS | CRYPTO | 49 / 500 | 113 |
He who abides far away from his home, is ever longing for the day he shall return.
nc 05.cr.yp.toc.tf 37331
None.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| polyRSA | CRYPTO (MEDIUM EASY) | 42 / 500 | 145 |
Hello RSA, my old friend!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Infinity castle | CRYPTO | 131 / 500 | 32 |
Can you break our new schema and decrypt the mixed encrypted message without having the public key and shared secret?!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Keydream | CRYPTO | 105 / 500 | 42 |
Everything is better homemade, we developed a homemade RSA, test it to see if it’s really better?
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Jeksign | CRYPTO | 100 / 500 | 45 |
Solve the equation, we like to have the solution!
nc 02.cr.yp.toc.tf 17113
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Volgo | CRYPTO | 65 / 500 | 77 |
There is no land behind the Volga!! The Soviets surround us,and we have only a single key table to communicate to the outside!! Hopefully, the Soviets wouldn’t be able read our messages.
http://03.cr.yp.toc.tf:11117/
None.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Aniely | CRYPTO | 66 / 500 | 76 |
There is stream cipher, try to keep it smooth!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Diploma | CRYPTO | 71 / 500 | 68 |
We are trying to solve matrix problem with only diploma! Here we go around the matrix!
nc 08.cr.yp.toc.tf 37313
None.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Oak land | CRYPTO | 122 / 500 | 35 |
Where to publish the great work!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Cantilever | CRYPTO | 79 / 500 | 60 |
What if you can find the message? If you can, that means you are genius, because we harden our crypto system with a very modern tool!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Side step | CRYPTO | 146 / 500 | 28 |
I like to have my own pow!
nc 01.cr.yp.toc.tf 17331
nc 02.cr.yp.toc.tf 17331
nc 03.cr.yp.toc.tf 17331
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Faonsa | CRYPTO | 180 / 500 | 21 |
Deploying the fault attack in real life is hard, we deployed it artificially!
nc 06.cr.yp.toc.tf 31117
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Resign | CRYPTO | 122 / 500 | 35 |
Everything is up to you, I just want it to be verified!
nc 03.cr.yp.toc.tf 11137
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| DBB | CRYPTO | 103 / 500 | 43 |
Old school but fun hopscotch!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Fiercest | CRYPTO | 142 / 500 | 29 |
Once again, we decided to deploy an artificial fault attack!
nc 04.cr.yp.toc.tf 37713
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Mino | CRYPTO | 169 / 500 | 23 |
You cannot have a good cryptosystem without mathematics! This task is an easy coding system!
nc 02.cr.yp.toc.tf 13771
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Starter ECC | CRYPTO | 103 / 500 | 43 |
Dive deep to the elliptic cryptosystem!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Watery soup | CRYPTO | 226 / 500 | 15 |
Find a message in a mess!
nc 05.cr.yp.toc.tf 37377
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| 313 Loyal | CRYPTO | 209 / 500 | 17 |
I have developed a probabilistic asymmetric algorithm for public key cryptography. Then I added some functions to harden it, you can try this oracle now. But I think it is still unbreakable! What about you?
Note: The source code updated, please download again!
nc 07.cr.yp.toc.tf 31377
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Soda | CRYPTO | 209 / 500 | 17 |
You may ask yourself how factoreal is skipping RSA? Here he comes with this one!
nc 01.cr.yp.toc.tf 37711
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Sparse | CRYPTO | 114 / 500 | 38 |
RSA is fun, the frozen RSA is even more fun!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Larisa | CRYPTO | 174 / 500 | 22 |
You think you can understand the way our cryptosystem encrypts messages? Here you can challenge yourself by decrypting this message!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Shaim | CRYPTO | 226 / 500 | 15 |
Do you believe that every hash function has weaknesses? If yes, can you find any collision?
nc 01.cr.yp.toc.tf 37113
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Lagima | CRYPTO | 164 / 500 | 24 |
You are in the road to learn some interesting cryptosystems, decrypt our cipher!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Versace | CRYPTO | 226 / 500 | 15 |
What is most important when we have prime numbers? Answer and decrypt the message!
Note: The output file has changed, Please download again!
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| Persian cat | CRYPTO | 247 / 500 | 13 |
Can you check this crypto system and let us know the message? You will find this crypto system very adroit!
nc 03.cr.yp.toc.tf 11173
nc 07.cr.yp.toc.tf 11173
nc 05.cr.yp.toc.tf 11173
nc 02.cr.yp.toc.tf 11173
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| NLCS | CRYPTO | 375 / 500 | 5 |
LFSR to rescue! Can LFSR actually help to this task?
See attachments.
See solutions.
| Name | Category | Points | Solves |
|---|---|---|---|
| GSDP | CRYPTO | 164 / 500 | 24 |
A very modern cryptography! Break it harder!
See attachments.
See solutions.
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