Two-factor authentication

Google Authenticator is an example of two-factor authentication that uses time synchronization.

Security token

Computer Security: Actually, it generates the digits on a time-based interval, if I press the button for it to generate the digits, it generates the digits and after about 25 seconds, and I press it again, the digits change not when I press it again immediately after I'd just pressed it. You press the green button to turn it on, type a PIN to unlock it, then press the green button again to generate a 6-digit code that you type when logging in.

Since the bank knows the unique encryption key, and all other other factors that the token uses, they can reverse-engineer the input to find out who "owns" that token. All rights reserved. I suspect this is not how your device works, since your device always gives you a different value every time you press the button. Note that https does nothing more than secure the connection between your browser and the server it's talking to.

Security token - Wikipedia

There's your hint. Psuedorandom Number Generators. But how does the synchronization work if you have something like a security token generating one-time passwords for you?

Viruses, worms, and other kinds of malware malicious software are often rumored to install keystroke loggers like this on people's computers. Many people choose trivial passwords that are easy to guess like their partner's or child's name, their own name, or even the word "password". You are here: Related It's a time based pseudo-random or cryptographic algorithm.

hash - How Do Hardware Token Devices work? - Stack Overflow

They might be reluctant to disclose, but disclosure is the only way to know if they're actually securing your verifications.

The main problem with time-synchronized tokens is that they can, over time, become unsynchronized. Obviously you might press the button when you're out of radio range, so the receiver and transmitter might have different button press numbers.

For disconnected tokens this time-synchronization is done before the token is distributed to the client. Online banks are also experimenting with a variety of different multi-factor authentication systems, including handheld card readers that generate one-time passwords using your credit-card number and PIN. In other words, some vendors are very strict with their timing windows. These tokens transfer a key sequence to the local client or to a nearby access point. Tokens in this category automatically transmit the authentication information to the client computer once a physical connection is made, eliminating the need for the user to manually enter the authentication information.

Investing Skip to Insurance navigation. I've found with my key fob, I can just enter the same number it's given me over and over. This is called a one-time password OTP and a new one is generated fresh each time you access the system.

This section's tone or style may not reflect the encyclopedic tone used on Wikipedia. If the owner of the token matches the owner of the bank account that is being logged-in to, then the login is authentic.

Tokens without any kind of certification are sometimes viewed as suspect, as they often do not meet accepted government or industry security standards, have not been put through rigorous testing, and likely cannot provide the same level of cryptographic security as token solutions which have had their designs independently audited by third-party agencies.

Then, as you press enter, you click your heels three times, chanting "I love my bank". Special designs include a USB connector, RFID functions or Bluetooth wireless interface to enable transfer of a generated key number sequence to a client system.

How does my online banking fob work? - onlinebanking password security Ask MetaFilter

October 13, Programmable tokens are marketed as "drop-in" replacement of mobile applications such as Google Authenticator miniOTP [8]. For login, I insert the card, scan the QR code on the screen and type my password for authentication in the device. Some tokens may store cryptographic keys , such as a digital signature , or biometric data, such as fingerprint details.