cryptography Archivi

Secure collaboration

In the office, on the road, at home, and in many other places, we often use tools and devices constantly connected to the Internet. This condition has greatly increased...

Falcon: digital signature based on NTRU

31 Jul

Introduction NIST’s Post-Quantum standardization process has identified two cryptographic schemes based on lattice theory within digital signatures: CRYSTALS-Dilithium and Falcon. Within modern cryptographic communication protocols, these solutions will replace the...

The One-Way And Trapdoor Functions: The Heart Of Modern Encryption

14 Dec

Introduction A one-way function is, by definition, a mathematical function that is easy to calculate but computationally difficult to invert. In other words, inverting a one-way function is equivalent to...

Quantum Key Distribution (QKD) and Post-Quantum Cryptography (PQC)

14 Nov

Today the quantum attacks threat is a real danger. The protection of data and communications is linked to technologies that give future-proof answers, capable of thwarting threats with still partially...

Digital signature algorithms: present and future

21 Oct

Abstract The digital signature is, in many respects, the analogue in the digital world of the handwritten signature that we all use on a daily basis. The main difference between...

Videoconference and security

03 Oct

In a historical moment in which virtual meetings are becoming the main means of communication, both in the workplace and in the school environment, it is necessary and essential to...

Key Negotiation in the Post-Quantum Era

09 Sep

Introduction Cryptography, understood as the set of information protection schemes, is typically divided into symmetric or private key cryptography and asymmetric or public key cryptography. Schemes or protocols that exploit...

Cryptophones: what they are and how they work

05 Sep

The issue of mobile communication security highlights one of the weak links in the security chain of organizations. It is often the behavior of individual employees, not necessarily malicious but...

Leon Battista Alberti’s cipher disk

18 Jul

Leon Battista Alberti’s cipher disk, described in “De cifris” around 1467, is the first polyalphabetic encryption system. The device consists of two concentric discs, rotating relative to each other, containing...

Post-Quantum Cryptography (PQC): a classical solution to the quantum threat

13 Jul

Introduction Public key (or asymmetric) cryptography is one of the bases on which all communication protocols rest which, starting from an insecure channel, must achieve multiple security properties, such as...