Problems

Twisted Layers

A scrambled string was processed through several hidden transformation layers. Using the provided broken script, โ€ฆ

Cryptography Hard 100 0
LCG-XOR: small seed, big leak

We encrypted a secret flag with a custom keystream XOR. The keystream is generated by โ€ฆ

Cryptography Medium 75 0
Stack Cipher โ€” single-byte XOR

A flag was encrypted with a single-byte XOR and saved as hex. Recover the flag. โ€ฆ

Cryptography Easy 35 1
ECB Art

An image containing a secret message (the flag) was encrypted using AES-128 in ECB mode. โ€ฆ

Cryptography Easy 30 0
Secret Caesar

You intercepted a short message: EgdqatbHiprz{WTAAD_LDGAS} ProblemStack{******}

Cryptography Easy 20 2