symmetric-cipher-attacks

ECB mode detection relies on identical plaintext blocks producing identical ciphertext blocks. You can perform cut-and-paste attacks by swapping ciphertext blocks or execute byte-at-a-time attacks to reveal hidden data.

CBC bit flipping alters ciphertext bits to predictably change corresponding plaintext bits in the next block. It targets predictable plaintext structures to modify encrypted data without knowing the key.

LCG and Mersenne Twister state recovery analyzes observed outputs to reconstruct internal PRNG states. By gathering sufficient sequential outputs, you can predict future values and reverse cryptographic operations relying on them.

These symmetric cipher attack techniques are explicitly designed for CTF cryptography challenges and lab-based defensive assessments. They provide practical walkthroughs for padding oracle, ECB, CBC, and state-recovery workflows against controlled test data.

Padding oracle attacks fail against implementations using authenticated encryption or constant-time decryption checks. Secure setups prevent distinguishing valid from invalid padding, halting byte-wise decryption and state manipulation.