Re: Bitcoin Is Not Quantum-Safe, And How We Can Fix It When Needed | Bitcoin Magazine

On 05/18/2016 11:14 AM, David Booth wrote:
> On 05/18/2016 10:58 AM, Dave Longley wrote:
>> On 05/17/2016 10:18 AM, Timothy Holborn wrote:
>>> It's an old article[1], wondering if their is any technical update
>>> since?
>>> [1]
>> This is exactly why using public key cryptography that relies upon the
>> assumed difficulty of particular math problems to encrypt data on a
>> public blockchain is a bad idea.
>> This means that using today's common asymmetric encryption methods of
>> RSA/ECC to encrypt certain types of data on a public blockchain should
>> not be considered secure. That encrypted data is available to everyone
>> ... and it won't stay encrypted for all that long. This is especially a
>> problem for identity-related information, which is often sensitive and
>> has a long shelf life.
> What alternatives would you suggest?

To follow on to my suggestion -- you can certainly put things like a
proof of existence on a public blockchain. Just don't put the
encrypted, highly sensitive, long-lived data itself there.

Dave Longley
Digital Bazaar, Inc.

Received on Wednesday, 18 May 2016 15:50:11 UTC