| Challenge Name | Description | Hint |
|---|---|---|
| xoracle | Check out my cool new encryption service! It's very secure! Connect to 0.cloud.chals.io on port 19305. | Read carefully: a small mistake or typo can be all it takes to make an encryption system insecure. |
| salad | Roman generals really knew how to make salad! | Look up some common types of ciphers. |
| new-algorithm | On the first day of the job, a new cryptography intern is insisting to upper management that he developed a new encryption algorithm. | What are some differences between encryption, encoding, and hashing? |
| Challenge Name | Description | Hint |
|---|---|---|
| hidden-in-plain-sight | A file contains the flag but it is encrypted. | The file looks a little longer than you would expect. |
| would-you-wordle | Someone left this secret text string and unfinished Wordle. Can you put them together to get the flag? pUpPHg3KfB15MG2KGtQQMDEECPOF8oa3VA== | Ron's Code |
| secret-message | Could there be a secret message somewhere? | The employees of both organizations passed Decoding 101 in high school, but failed Encryption 101 in college. |
| Challenge Name | Description | Hint |
|---|---|---|
| file-zip-cracker | Fix the script to brute force the password. | No hints. |
| audio-transmission | We have intercepted an audio transmission from a known criminal organization. | No hints. |
| inDEStructible | It's an older code, sir or madam, but it checks out. | No hints. |