Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [hybrid]

Something of mixed origin. In cryptography, typically a cipher system containing both public key and secret key component ciphers, where the public key system is used only to transport the key for the secret key cipher. It is the secret key cipher which actually enciphers and protects the data.

1
vote
2answers
56 views

How many keys in a Hybrid Cryptosystem?

If symmetric cryptosystems have $C^2_n$ keys, and asymmetric systems have $2n$ keys, how many does a hybrid system have? This was in an online quiz from school Company A is considering to adopt ...
0
votes
2answers
48 views

Commitment scheme: hiding property

Given two commitment schemes $Com_1, Com_2$ (both have the hiding property), I'd like to prove $Com_1(m) || Com_2(m)$ is also hiding. I built these hybrids and want to show $H_0 =_c H_1 =_c H_2$. \...
0
votes
1answer
31 views

Given paramaters of an Edward's curve and x, determine a y value if it exists

I'm making a demonstration cryptosystem using ECC ElGamal. I've currently got a working implementation of Edward's Curve operations and a basic ElGamal implementation (Encrypts only points on the ...
3
votes
1answer
113 views

How to securely map messages to points on an elliptic curve

I'm implementing a demonstration hybrid cryptosystem in Python (FinCrypt, I know the name is bad) and I'm migrating over from my Weierstrass curve implementation, which was based off of this, to one ...
2
votes
2answers
49 views

Encrypting with Asymmetric keys

I'm designing a system where the client asked for documents to be encrypted with "asymmetric cryptography". I've explained them that the best practice is to encrypt the data with a symmetric ...
-2
votes
2answers
76 views

In cryptography is there such as thing as disguising unencrypted text?

Just wondered: I currently have TrueCrypt on my system (I am aware that there are various doubts about its penetrability, and that it is no longer under development). TC "volumes" obviously consist ...
2
votes
2answers
234 views

Doing RSA-KEM with RSA-OAEP

I am fiddling around with the JS Web Crypto API and creating a hybrid encryption system that uses a symmetric key to encrypt form data with AES256-CBC and and a public/private key-pair to wrap/...
3
votes
1answer
55 views

Is a signature scheme using a hash considered a hybrid cryptosystem?

In Wikipedia there is a page on hybrid cryptosystems. However, although cryptography contains a lot more than just encryption, only hybrid encryption using key encapsulation and data encapsulation is ...
1
vote
0answers
59 views

Can I overcome ElGamal malleability with AES preprocessing?

So textbook ElGamal is known to be vulnerable to CPA, and although there are several proposals (DHAES/EIES) for modifications none of those are formally accepted or standardized. My question is ...
1
vote
1answer
77 views

Would reuse of the symmetric key in a hybrid cryptosystem between files be inherently insecure?

This question stems from a UX problem where I want to allow the user to input their PIN only one single time when they open up an mobile app. Here are some properties of the application to provide ...
2
votes
1answer
74 views

Hybrid authenticated protocol

Let's suppose that two entities, A and B, are establishing a secure channel and then require a mutual authentication. A has only a RSA key pair and B has an ECDSA key pair. Both of them trust the ...
2
votes
1answer
173 views

disadvantages of combination stream and block ciphers

I've encountered some papers online describing ciphers made through a combination of stream and block ciphers. (See this 2008 paper by Sandy Harris: https://eprint.iacr.org/2008/473.pdf) In a ...
0
votes
1answer
897 views

How to do statistical analysis on encrypted / anonimized data

Let's imagine Alice wants to send Bob a table with 2 columns: ...
0
votes
0answers
130 views

Why is RSA still being used? [duplicate]

In hybrid encrytion, I still see that some site's use RSA in their https connection, so now I wonder, why do they not use ECC instead of RSA, ECC requires less computational power and encrypt's and ...
1
vote
1answer
172 views

What is the viability of a hybrid vigenere cipher?

So a vigenere cipher's main weakness is that you can use frequency analysis on each alternated alphabet, and thus crack the cipher with relative ease... But that implies that you know what the ...
4
votes
2answers
6k views

Why is hybrid encryption more effective than other encryption scheme?

Currently I am learning about Hybrid Encryption but I was not able to find any good study material. Below is my understanding: One of the reason why we use ...
3
votes
1answer
691 views

Symmetric encryption using RSA for random generated password

I'm fairly new to encryption, so I wanted to check the logic for a .net solution I'm working on that encrypts data between two parties. the receiving (decrypting) party will have an RSA key pair ...
24
votes
1answer
10k views

Multi-party encryption algorithm

To give some foreground information: I acknowledge that I am a cryptography newb and not by any means an expert (and probably never will be). In a recent CS class we had several assignments writing ...
2
votes
1answer
185 views

hybrid PKE scheme CCA2 insecurity

I'm reading "An Efficient CCA2-Secure Variant of the McEliece Cryptosystem in the standard model" by Rastaghi which states: As we know, in hybrid PKE schemes XOR alone cannot perfectly hide ...