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 Apr18 reviewed Approve Proving that a plaintext is the Paillier decryption of a certain ciphertext Apr10 reviewed Reject Differences Between White-Box Cryptography and Code Obfuscation Apr5 reviewed Approve Why is diffie-hellmangroup1-sha1 used instead of diffie-hellman? Apr1 reviewed Reject Is there any pattern in points on EC? Mar11 comment Is the 1st Encrypted Block Less Secure Than Subsequent Ones? @D.W I'm not trying to make a fuss, but I know that efforts to maintain a high standard on content can dissuade newer users from participating further. This is my main concern, and this is why I write this to you Mar11 comment Is the 1st Encrypted Block Less Secure Than Subsequent Ones? @D.W The OP described the two modes of operation correctly, which suggests he has already consulted standard sources. Not everyone can figure stuff out on their own, nor can they ask good questions all the time. Your entire comment was aimed at helping the OP, but only the last two sentences do so. This question is OK. Mar11 awarded Yearling Mar2 comment Vigenere ciphers : Need help for math analysis Oh I see. Does it work with $k=$ homehomehome... instead? Mar2 comment Vigenere ciphers : Need help for math analysis Hello Eko. I tried editing your question to texify but I don't understand what the symbol ▒ is (final equation, in the sums, after $k$). Anyway, the key $k$ is not modified during encryption/decryption; typically when you run out of characters in the key, you start over (eg. $k_i=k_{(i \mod l(k))}$, where $l(k)$ is the length of the key.) I hope this helps. Feb28 reviewed Approve What do you think about this message encryption? Feb28 reviewed Approve Differences between Work Factor and Time Complexity Feb20 reviewed Reject Is AES-256 weaker than 192 and 128 bit versions? Feb20 reviewed Approve Are Barreto-Naehrig Curves suitable for pairing-based cryptography? Feb16 awarded Popular Question Feb14 reviewed Reject Which characters to take into account when calculating unicity distance? Feb11 reviewed Approve Analogue encryption algorithms Feb10 reviewed Approve Attacking multi block MAC constructions Feb1 reviewed Approve Proof that $gcd(e, \lambda(N)) = 1 \hspace{1mm} \Longleftrightarrow \hspace{1mm} gcd(e, \varphi(N)) = 1$ Jan23 reviewed Approve Random Galois fields Jan22 reviewed Approve How does cryptanalysis of the Playfair cipher work?