# Questions tagged [encryption]

Encryption is the process of transforming plaintext using a cipher into ciphertext to make it unreadable to anyone except those possessing the key. Decryption is the process of transforming that ciphertext back into plaintext, using the key.

3,017 questions
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### Is using the same IV in AES similar to not using an IV in the first place?

So if I understand how an IV works with AES, I'm supposed to generate a different IV for every message because using only a key, I will get the same encryption if the message was encrypted twice (...
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### Create a time capsule on wots

I was wondering if there's any option to create sort of a time capsule in a Word document, i.e. not encrypted by password rather than a date. Let's say I send the document today but the receiving side ...
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### DES/AES invertibility

My professor has posted a couple of practice questions that so far I haven't been able to find the answer for and I was hoping you could help. DES would remain invertible—it would still be ...
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### What is the common way to find the distance dual of linear block code?

I know the distance of dual of reed solomon codes is n-k+1 beacuase it is MDS code. Now us consider the following linear block code C:\mathbb{F}^{k}\rightarrow \mathbb{F}^{n}\\ (c_0,...
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### Is One Time Pad considered Chosen-Plaintext Attack Secure?

If we're considering Chosen-Plaintext Attack setting, then the adversary has access to the Encryption Oracle right, and we know that OTP is only considered secure if we use the key only once. How ...
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### Generating sets of unreadable/secure and unique random numbers

In the process of some research I have been doing I stumbled across the following 2 claims on the PokerStars website. We do record all of the hole cards in all real money hands. This is an ...
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### What is the main difference between a key, an IV and a nonce?

What are the main differences between a nonce, a key and an IV? Without any doubt the key should be kept secret. But what about the nonce and the IV? What's the main difference between them and their ...
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### While using onetime encryption is it possible that one can deduce the key of a message if the contents of the message are already known?

Let's say we have a randomly encrypted message and I pasted the contents of that message on a blog for some reason I do not share the key. Would you be able to figure out the key? This is the ...
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### Vigenere Cipher Methods

Is there already a cipher which uses a method like vigenere yet the shifted encrypting alphabets are mixed? i.e. ASDFGHJKLZXCVBNMQWERTYUIOP BNMQWERTYUIOPASDFGHJKLZXCV CVBNMQWERTYUIOPASDFGHJKLZX etc....