PSA:Blockchain.info paper backup stores private key unencrypted in browser cache

Problem outline:
- Paper wallet backups generate a pdf which is saved unencrypted in the browsers cache.
In Chrome for example a search of the browsers history using 'data:application/pdf' will show the cached paper backups with the private keys in plain view.
- Storing unencrypted private keys in the browsers cache leaves the wallets vulnerable to malware attacks.

Suggested actions for users:
- If you have generated a paper backup clear your browser cache. For additional security create a new wallet and transfer coins to it.
If using blockchain.info for the new wallet, do not create a paper backup.

Suggested solution for blockchain.info:
- Generate paper wallet backups in html and do not save in the browsers cache.

Additional problems:
- The email address of [email protected] listed on the blockchain.info website does not work. There appears to be no dedicated security contact point.
- I have received numerous email backups automatically without user request.

Topic: PSA:Blockchain.info paper backup stores private key unencrypted in browser cache (Read 4581 times)