From the course: Threat Modeling: Repudiation in Depth
Join today to access over 22,600 courses taught by industry experts or purchase this course individually.
Cryptographic defenses
From the course: Threat Modeling: Repudiation in Depth
Cryptographic defenses
- [Instructor] Let's distinguish digital signatures from electronic ones. Both are ways to sign things. An electronic signature is what a website does to make a cheesy little graphic version of your signature. A digital signature uses public key cryptography and in that sense, the use of a digital signature with public key cryptography is a mathematically unambiguous statement. This private key was used in a mathematical operation on this document. We use RSA and other asymmetric algorithms for this and call it a signature and in many ways, it's very strong non-repudiation. It's often done with a hash of the document or message. A cryptographic hash is a function that's designed to be easy to compute and hard to predict. Any change to the input should permute the entire output. It's sometimes called a one-way function or a trap door to capture that one-way nature. A hash takes any amount of input and produces a…
Download courses and learn on the go
Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.