Cramer-Shoup asymmetric encryption (an extension of ElGamal)

learn more… | top users | synonyms

0
votes
0answers
24 views

Elgamal and Cramer-Shoup encryption: Given private key and ciphertext, can public key be determined?

I have a potential use case for Elgamal or Cramer-Shoup encryption which would effectively reverse the visibility of the public and private keys. The ciphertext and private key would be published and ...
2
votes
1answer
124 views

Is Cramer-Shoup backdoorable?

We recently had the question whether it's possible to have multiple private keys with one public key for the cramer-shoup cryptosystem. There it was stated that finding such "secondary" private keys ...
0
votes
1answer
50 views

Can a Cramer-Shoup public key have two different private keys?

Since I am new to the Cramer-Shoup algorithm, I would like to know: Is it possible to have two different private keys for a public key due the key pair generation algorithm that Cramer-Shoup uses? I ...
1
vote
1answer
235 views

Key construction in the Full Cramer-Shoup cryptosystem

The Full Cramer-Shoup Encryption scheme needs to choose six random numbers from $\mathbb{Z}_q$, which we denote them by $ x_1,x_2,y_1,y_2,z_1,z_2 $. Then the scheme hides these random numbers in the ...