** N.B. Preview only, please don't store coins at addresses you generate **
The StrongCoin online wallet service is nearing then end of initial development. http://strongcoin.com
I've written a blog article on generating coins from a book cipher http://strongcoin.com/blog/using_a_book_cipher_to_generate_bitcoin_addresses
which may be of interest.
We've now added the ability to generate bitcoin addresses from a sentence as well as a PDF download (Paper wallet) that gives you a backup of any addresses you create in StrongCoin.
This is only meant as a preview and to get feedback. I'm currently looking at the algorithm used to encrypt the private key on the client side as Ideally I'd like to use an algorithm that is compatible with command line tools for decryption.
So I'm happy to say we've progressed well towards our main goals which are...
1. Private key backup. Never have to worry about losing a wallet.dat file.
2. No naked private keys stored on our server.
2. Keypair generation within the browser and private keys encrypted before transmission.
3. The ability to use your Bitcoin keypairs independant of our service via the paper wallet.
We're currently working hard on the payments section.