Collaborate Disseminate
In RFC7616 for Digest Authentication, the nonce count (nc) is described as
The nc value is the hexadecimal count of the number of requests (including the current request) that the client has sent with the nonce value in this request.
and… Continue reading Usage of Nonce Count in digest authentication
In digest authentication we use something that is called cnonce.
According to RFC7616:
This parameter MUST be used by all implementations. The cnonce value is an opaque quoted ASCII-only string value provided by the client and used by bot… Continue reading What is cnonce in Digest Authentication
During my pentest of a client’s websites I stumbled upon the WP with vulnerable WP Statistics plugin installed.
To exploit this vulnerability, I should send a JSON-API request to endpoint /json-api/wp-statistics/v2/…. The problem is I mu… Continue reading How to obtain "wp_rest" nonce for WP Statistics plugin manually?
I understand that a nonce is used to prevent replay attacks. I have been going through documentations, specs, posts and blog posts and I am a little confused.
Consider the following attack scenario.
Mary wants to login to https://photos.c… Continue reading OpenId Connect and proper usage of nonce
Looking at this question Openid connect nonce replay attack and the answer by @benbotto. I understand the replay attack in implicit flow but unable to understand it for auth code flow. Let’s say an attacker intercepts the authentication re… Continue reading Openid nonce replay attack in auth code flow
SHA-256 generates a 32-byte hash, Is it a safe practice to use the first 16 as an iv (nonce) and the second 16 as a key ?
What other things I should consider when using PBKDF2 in a scenario like this ?
Continue reading Can I use part of PBKDF2 output as an IV (nonce)?
I need validation / feedback please with the implementation of a web based client-server application that I am building.
I need to make sure that a client’s cookies can’t be hijacked and therefore I have introduced a nonce.
So with each re… Continue reading Using predictable incrementing nonces
I want to implement a service that can’t read the data you store there.
The Idea is that I, like in a password manager, use the password to derive a vault key, which is different from the authentication key, that is used to encrypt/decrypt… Continue reading Multiple devices encrypting data using the same key?
I am trying to figure out how to build a secure, playback-proof, web authentication scheme and at the same time be able to use a KEK at the server.
After a lot of reading it seems that a reasonable way to validate the password between the … Continue reading Web authentication, replay, nonce and KEK
I stumbled upon a web app which is accepting user input and putting it into a variable within script tag.
The script tag does have a nonce attribute.
As am working on bypassing the XSS filter, I had this thought that this practice of refl… Continue reading Is nonce useless when user input is reflected within an inline script?