305 views

### What is the significance of IV in stream ciphers like Trivium?

In Trivium cipher, an 80-bit key and 80-bit IV (initialization vector) are used initially to set up the initial state. I would like to know, Role of IV in stream cipher? Can we make IV a secret ...
110 views

### How can I find the original message of two encrypted (Vernam Cipher) text without the key [duplicate]

Can I get the steps or the solution if possible?
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### Is there any vulnerability in this scheme?

We want to design a symmetric encryption scheme. Note that the following things are true for our system: The plaintext P will change every time for a given user. A user will choose a password which ...
202 views

### Modification of vigenere cipher cryptographically secure?

After looking for ages online for a python implementation of the Vigenere cipher, and finding few, I decided to implement it myself. After ironing out all of the flaws, it's now a working (and secure) ...
311 views

### XOR and key reuse [duplicate]

I've been doing a bit of reading on the use of XOR and the dangers of key reuse. I'm aware that reusing a key can open a door for a frequency analysis attack on my plain text. So far, everything ...
594 views

### Does ChaCha20 counter actually increment through iterations?

RFC defines: state = constants | key | counter | nonce Suggested on multiple places is to set counter to 0 or 1. It is still ...