2022-04-23 | #cryptography #security
The variance of an aleatory variable X is a statistical measure of the
spread (or dispersion) of a set of values for a random variable.
Variance is defined as the squared deviations of the values from the mean. In
other words, it measures how far the values of a random variable X are spread
out from its expected value E[X].
2022-02-02 | #btrfs #system
RAID1 is a data replication technique that stores two copies of data on two different disks, providing fault tolerance and high availability in case one of the disks fails.
With btrfs, you can create a RAID1 array by combining two or more devices. The devices can be physical disks or partitions.
2021-06-04 | #mathematics #number-theory
Euclid’s Theorem. Primes are infinite.
Proof. Let’s assume that the set of primes P = {p₁, ..., pₙ} is finite and
let k = ∏ pᵢ. If the factorization of k+1 contains one prime pᵢ ∈ P then
pᵢ|k+1. Since pᵢ|k then pᵢ|(k+1-k)=1, which is impossible. Follows that
k+1 is a new prime or is divisible by a prime not in P.
2021-03-29 | #btrfs #system
Btrfs snapshots allow you to create efficient backups of your filesystem.
We’ll explore some of the basics of Btrfs snapshots and their practical applications.
Snapshot feature of Btrfs uses the Copy-on-Write (CoW) strategy. So it doesn’t take much disk space and snapshots of subvolumes are instantaneous.
2020-02-21 | #iot #networking #security #standards
Walkthrough security aspects of one of the most widespread protocols in the smart metering and related IoT applications industry.
The slideshow has been used during the Microchip’s European Masters conference in Berlin.
2019-09-29 | #linear-algebra #mathematics #programming #python
Under the name Numerical Analysis identifies the study of numerical methods for the resolution of complex problems.
The numerical methods are algorithms executable by a machine, that allows a usually approximate, resolution of complex physical and mathematical issues.
2019-03-02 | #distributed-systems
A glimpse to the world of Cyber Physical Systems that are changing the world as we know.
From the isolated Monolithic Systems to the conception of System of Systems that are able to interact with the surrounding physical world.
2019-02-16 | #cryptography #security
Data-Origin Authentication: the process of verifying that the data comes from the source it claims coming from. This is typically done using some cryptographic technique such as digital signatures or message authentication codes.
2019-02-14 | #linear-algebra #mathematics
A concise summary of the core concepts in linear algebra.
In the attached document I cover fundamental topics such as vectors, matrices, systems of linear equations, and transformations.
Understanding these concepts is essential for tackling a wide range of mathematical and real-world problems.
2018-11-07 | #cryptography #history
During World War II, the Enigma machine presented a formidable challenge to the Allied forces as they struggled to decipher encrypted German messages.
However, a team of brilliant codebreakers, including Alan Turing, at Britain’s Bletchley Park successfully cracked Enigma’s codes, turning the tide of the war.
