Questions tagged [elgamal]
68 questions
17
votes
5 answers
Getting GPG Decryption To Work In Java (Bouncy Castle)
let me start by saying I'm extremely new to all of this. What I am trying to do is to use gpg from within Java in order to decrypt an encrypted file.
What I've done successfully:
Had a colleague encrypt a file using my public key and his private…
Craig
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6
votes
1 answer
Free implementation of Elgamal
I'm looking for free implementations of the Elgamal encryption algorithm. As far as I can see, even though it's a widely known algorithm, there seems to be only two free implementations:
libgcrypt supports Elgamal encryption
pycrypt has…
Jay
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6
votes
1 answer
Encrypt AES secret key with Elliptic Curve ElGamal
There is Alice and Bob. I want to realize the following process:
Alice encrypts a text with AES and generates a secret key
Alice encrypts this secret key with Bobs public key using Elliptic Curves with El Gamal
Alice sends the encrypted text &…
aslanj
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5
votes
2 answers
El Gamal faster than RSA with the same modulus length?
Why is El Gamal faster than RSA with the same modulus length?
Daniel Gartmann
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4
votes
1 answer
Data loss when encrypting and decrypting using libgcrypt and Elgamal
I am using Libgcrypt with Elgamal to encrypt a block of bytes, and I am having 2 problems:
When I do not use padding and my block of bytes starts which an zero byte, I lose the first byte during decryption;
If I use padding the encryption works…
Tiago Queiroz
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3
votes
1 answer
How to Make Encryption (c1, c2) Tuple Explicit using Bouncy Castle ElGamal and javax.crypto.Cipher
To encrypt a message with ElGamal scheme in java code, I proceed as follow:
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance("Elgamal/NOne/NoPadding", "BC");
KeyPaireGenerator…
RaphaëlR
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3
votes
2 answers
How to encrypt/decrypt text files using ElGamal
I'm trying to encrypt and decrypt text files using ElGamal for my study but it seems that I could not make it work correctly.
I have a group of text files ranging from 1kb - 1mb, and I'm using 512bit for my key size. I already know that just like…
celax
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3
votes
1 answer
ElGamal encryption example?
I apologise in advance for the n00bishness of asking this question, but I've been stuck for ages and I'm struggling to figure out what to do next. Essentially, I am trying to perform ElGamal encryption on some data. I have been given the public part…
Kushan
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3
votes
1 answer
Generate dsa/elgamal key pair with bouncy castle that imports in GPG without error
I have created a small program to generate a DSA / El Gamal PGP Key Ring using Bouncy Castle 1.47 API. The key generation goes real well without an error. I export the private and public key to a file using armored output and when I try to import…
george_h
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3
votes
1 answer
Has anybody Implemented ElGamal using OpenSSL or even inside?
I find out that OpenSSL hasn't implemented ElGamal. However, currently I need to use OpenSSL to implement ElGamal. I just wonder if anybody had done it before. And that may help me to reduce my work load. And, if not, is that feasible to implement…
Vincent
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3
votes
2 answers
Elliptic curve ElGamal Java implementation
Is there a simple implementation (using Java BigInteger) of ElGamal elliptic curve cryptosystem with key generation, encryption and decryption functions; one that could be used to explain to university students in a lecture?
For example, a Paillier…
xtremebytes
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3
votes
0 answers
Bouncy castle error: Unable to cast object of type RsaPrivateCrtKeyParameters to type ElGamalKeyParameters
I am having difficulties with decryption of a GPG file using Bouncy Castle. I have the encrypted file and I have a private key and the password for the private key. I can successfully decrypt the file using the desktop software GPG4win Kleopatra so…
DaveBeta
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2
votes
2 answers
What are good and safe keylength for El-Gamal?
What are good keylength for El-Gamal?
Daniel Gartmann
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2
votes
0 answers
Python - Algorithm for finding order of cyclic group generator
I wanted to find the order of a generator g chosen from a cyclic group G = Z*q where q is a very large (hundreds of bits long) number. I have tried the following code from Rosetta Code but it is taking too long:
def gcd(a, b):
while b != 0:
…
user7091463
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2
votes
1 answer
El Gamal digital signature construction inexplicably failing
I am trying to implement the El Gamal digital signature scheme, using the BigInteger class for generating large prime numbers. Samantha generates the public key, the private key, chooses a message, signs it and then Victor verifies the…
Bogdan Kandra
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