jeeq: ECDSA encryption - page 2. | Bitcointalksearch.org

Zeilap

full member

Activity: 154

Merit: 100

You've come up with ElGamal encryption independently. Pretty impressive

.

etotheipi

legendary

Activity: 1428

Merit: 1093

Core Armory Developer

Did you look at ECIES?

jackjack

legendary

Activity: 1176

Merit: 1280

May Bitcoin be touched by his Noodly Appendage

Hey all
I read everywhere that ECDSA can't be used to encrypt
The fact is it can, I made a basic implementation: https://github.com/jackjack-jj/jeeq

It uses a kind of secret sharing and it looks like that works well
It's in python and requires no dependencies

Code:

> pubkey='0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8'.decode('hex')
> print encrypt_message(pubkey,"goodbye world!")
amoAAAJQkgEDcToivOFhH0zhaytsAKbW9dKCmOJ25FMPaj/6WssXAQKsSJpnq1IlNOx7GZbg++x6ZRUXAb/3jxaxwPGqlcItmA==

Code:

> pvk = str_to_long('0000000000000000000000000000000000000000000000000000000000000001'.decode('hex'))
> print 'output:', decrypt_message(pvk, msg_to_decrypt, verbose=True)
Public header (size:2): 0x5092
  Version: 0
  Checksum of pubkey: 5092
Private header (size:6): 0x0000000e75f1
  Message size: 14
  Checksum: 75f1
Decrypted message: goodbye world!
  Hash: 75f1
  Corresponds: True
output: ['goodbye world!', True]

My concern is about the security, can a crypto-pro give it a quick look? I'm sure it's as sure as signing because breaking it would need the same discrete logarithm than in Bitcoin but well, you never know...

Edit: I'd be happy to receive some crypted messages, you can find my public key on blockchain.info

Topic: jeeq: ECDSA encryption - page 2. (Read 5532 times)