Crypto Archivi - Page 2 of 4

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

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...

Secure communications: end-to-end encryption (E2EE)

28 Oct

End-to-end encryption is a message encryption method based on asymmetric encryption algorithms and the decentralization of cryptographic keys. Is an encrypted communication system in which only people who are communicating...

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...

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...

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...

The logical qubit and the correction of quantum errors

18 May

Introduction: Physical Qubit vs Logical Qubit As discussed in the previous article, the unit of information processed by a quantum computer is generically called Qubit or Quantum Bit. However, for...

Al-Kindi, the father of cryptanalysis

04 Apr

Abu Yūsuf Yaʻqūb ibn ʼIsḥāq aṣ-Ṣabbāḥ al-Kindi was born in 801 in Kufa or Basra, Iraq, and died in Baghdad in 873. He is known as “the philosopher of the...

Shor’s Quantum Algorithm

29 Mar

Introduction Among the numerous applications of the quantum computing model, the most relevant in the cryptographic field is represented by the work of the American computer scientist Peter W. Shor....

The Caesar cipher

07 Feb

In cryptography, the Caesar cipher is one of the oldest cryptographic algorithms of which there is a historical trace. It is a mono-alphabetic substitution cipher, in which each letter of...