Solutions to Net-Force Cryptography CTF Challenges

By Pranshu Bajpai

Cryptanalysis refers to the study of ciphers with the objective of breaking the code and obtaining plaintext (sensible) information. While older cryptosystems such as Caesar cipher depended on the secrecy of the encrypting algorithm itself, modern cryptosystems assume adversarial knowledge of algorithm and the cryptosystem. The promise of secrecy is offered by a protected key, which is crucial for the decryption of ciphertext within a practical timeframe. During cryptanalysis, we do not have the key and are required to obtain the corresponding plaintext.

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