Collaborate Disseminate
In addition to my question: How many known time/result combinations does it take to guess a HOTP/TOTP secret?.
I’ve read often that TOTP is more secure than HOTP. One example:
TOTP provides higher security due to its time-based nature, re… Continue reading Is TOTP "more secure" and harder to crack than HOTP and why?
According to this disused repository Google Authenticator implements OATH TOTP (RFC 6238) and OATH HOTP (RFC 4226). Those RFCs each seem to describe a secret that the user’s device on which Authenticator runs must know. In principle the … Continue reading Where does Google Authenticator store its secrets on iOS?
RFC 4226 on HOTP (7.1 Authentication Protocol Requirements) says
RP3 – P [the protocol] SHOULD be implemented over a secure channel in order to
protect users’ privacy and avoid replay attacks.
But isn’t the basic idea of HOTP (and TOTP) … Continue reading Does the lack of a secure channel really allow a replay attack to HOTP?
I know that the concept of TOTP is for when the device on which the code is to be verified is separate from the device that is going to generate the code.
However, I was wondering if it is a bad idea to use the TOTP algorithm for generatin… Continue reading Does TOTP make sense for verification codes?
I have a Yubikey 5, I can store a PGP key inside, it has OTP abilities, FIDO, NFC, etc… Which is great for a device like this.
First of all, I understand how a smart card is more secured than an app/sms based OTP for instance, but seeing… Continue reading Why would a U2F key be more secured than an OTP device?
As I was unable to find any thread about this particular question, I’m trying to ask the community for help.
We’re currently using RSA RADIUS based 2FA to authenticate external VPN users from companies to let them manage their systems ins… Continue reading prevent/prohibit duplication of MFA software-token / ensure user identity
I want to generate an OTP, that is valid once in a certain time window in the future. That time window is in the range of minutes to hours. After being used in that window, the OTP may not be used again. I found TOTP and HOTP… Continue reading One time password: combine time window and counter
Google authenticator uses HOTP and TOTP algorithm for TFA.
What is the basic working principle of DUO push? What brings security to DUO push?
Continue reading How does DUO push button method and other methods actually work?
I have seen many experts advising usage of some kind of OTP as second step of 2FA schemes.
I fully understand 2FA is more secure than Single Authorization, but it is also more inconvenient for a casual user.
What about replacing passwords … Continue reading Is using HOTP only authorization considered weak?
I have a requirement of OTP applications on mobile devices not sharing the same secret (even if the mobile devices are owned by the same user). A single secret must be present in a single device.
Open source applications tha… Continue reading Prevention of devices using same OTP secret