The encryption/decryption key is never transmitted. Only the encrypted result, salt, and IV are sent to Authy.If any Authenticator keys are 128 bits or less, we pad them using PKCS#5.To make each message unique, an IV must be used in the first block. Using the derived key, each authenticator key is encrypted with Advanced Encryption Standard AES-256, in Cipher Block Chaining (CBC) mode along with a different initialization vector ( IV) for each account.The salt is generated using a secure random value.We salt the password before starting the 1000 rounds.This number will increase as the low range Android phone’s processor power increases. It’s a one-way function – it cannot be decrypted back and is one of the strongest hash functions available. We use a secure hash algorithm that is is one of the strongest hash functions available.The details of how this is done are quite important: PBKDF2 is a key stretching algorithm used to hash passwords in such a way that brute-force attacks are less effective. Your password is then salted and run through a key derivation function called PBKDF2, which stands for Password-Based Key Derivation Function 2.Passwords must be 6 characters long, although we recommend that you aim for at least 8 characters. (Apologies to users if this part of the post gets a bit technical, but developers will get it.) How the Authy key backups work: To make backups compatible across devices, all Authy iOS, Android, and desktop apps use the same method for encryption/decryption. The account is encrypted/decrypted inside your phone, so neither Authy or anyone affiliated with Authy have access to your accounts. For your convenience, Authy can store an encrypted copy of your Authenticator accounts in the cloud. Let’s set the record straight on how we handle encryption. If you don’t need the convenience of backups, no problem - simply keep backups disabled. You are not required to sync your keys to Authy in order to use your phone as a second factor. If you do not enable backups, your accounts will only be stored inside your phone (just like most other 2FA apps). With that said, let’s look at how this feature works. Forget it, and you lose the only way to decrypt your 2FA tokens. I also want to make it really clear that the password used for encrypting your 2FA tokens is NOT stored anywhere in our cloud service. We occasionally get questions about this particular feature from both users and developers, so this post will explain how the backup feature works in order to assuage any security or privacy concerns. That prompted a lot of users to switch to Authy in order to take advantage of our backup feature. A few years ago Google Authenticator released an update for their iPhone App that wiped users 2FA tokens when installed.
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