Cryptanalysis of Classical Ciphers with Multiple Encryption

Have you ever wondered how multiple encryption affects the security of the famous classical ciphers, Caesar, Substitution and Vigen√®re? Does encrypting plaintext multiple times improve, weaken or not affect the overall Cipher strength? The conclusion, unsurprisingly, is that multiple rounds of encryption are equivalent to encrypting the plaintext once. Here’s why. Continue reading “Cryptanalysis of Classical Ciphers with Multiple Encryption”

Pragyan – Steganography

ctf.pragyan.org

Lost Friends – 300

Moana and her friends were out on a sea voyage, spending their summer joyously.
Unfortnately, they came across Charybdis, the sea monster. Charybdis, furious over having unknown visitors, wreaked havoc on their ship. The ship was lost.
 
Luckily, Moana survived, and she was swept to a nearby island. But, since then, she has not seen her friends. Moana has come to you for help. She believes that her friends are still alive, and that you are the only one who can help her find them.

Continue reading “Pragyan – Steganography”

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