Cryptography is the process of hiding or coding information so that only the person a message was intended for can read it. The art of cryptography has been used to code messages for thousands of years and continues to be used in bank cards, computer passwords, and ecommerce. Modern cryptography techniques include algorithms and ciphers that enable the encryption and decryption of information, such as 128‑bit and 256‑bit encryption keys. Modern ciphers, such as the Advanced Encryption Standard (AES), are considered virtually unbreakable.

A common cryptography definition is the practice of coding information to ensure only the person that a message was written for can read and process the information. This cybersecurity practice, also known as cryptology, combines various disciplines like computer science, engineering, and mathematics to create complex codes that hide the true meaning of a message. Cryptography can be traced all the way back to ancient Egyptian hieroglyphics but remains vital to securing communication and information in transit and preventing it from being read by untrusted parties. It uses algorithms and mathematical concepts to transform messages into difficult‑to‑decipher codes through techniques like cryptographic keys and digital signing to protect data privacy, credit card transactions, email, and web browsing.

Cryptography remains important to protecting data and users, ensuring confidentiality, and preventing cyber criminals from intercepting sensitive corporate information. Individuals and organizations use cryptography on a daily basis to protect their privacy and keep their conversations and data confidential. The technique ensures confidentiality by encrypting sent messages using an algorithm with a key only known to the sender and recipient. A common example of this is the messaging tool WhatsApp, which encrypts conversations between people to ensure they cannot be hacked or intercepted. It also secures browsing, such as with virtual private networks (VPNs), which use encrypted tunnels, asymmetric encryption, and public and private shared keys.

Similar to how cryptography can confirm the authenticity of a message, it can also prove the integrity of the information being sent and received. The technology also ensures information is not altered while in storage or during transit between the sender and the intended recipient. For example, digital signatures can detect forgery or tampering in software distribution and  financial transactions.Cryptography confirms accountability and responsibility from the sender of a message, which means they cannot later deny their intentions when they created or transmitted information. Digital signatures are a good example of this, as they ensure a sender cannot claim a message, contract, or document they created to be fraudulent. Furthermore, in email nonrepudiation, email tracking makes sure the sender cannot deny sending a message and a recipient cannot deny receiving it.

There are many types of cryptographic algorithms available. They vary in complexity and security, depending on the type of communication and the sensitivity of the information being shared.

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Should schools just say no to pupils using phones?

14th July 2024

Natalie Grice – BBC News

“I wouldn’t say it’s a good thing for a child never to have a smartphone. I think it’s part of a balanced life. You’ve got to live in your own time.”

These are not the words you might expect to hear from a teacher at a school that has never in its history allowed pupils under sixth form age to use a mobile phone on the premises.

But Sarah Owen, deputy head at Stanwell School in Penarth, Vale of Glamorgan, was simply expressing a personal opinion, rather than the school’s view about a young person’s wider life.

It is clear that she and the school have very firm opinions on what is best for children while they are on school grounds.

For Stanwell pupils in years 7 to 11, that has always meant no phones. Not in lessons, not in the corridor, not at breaktimes.

It is such a long-established rule that it presumably comes as no surprise to pupils and parents when they join the school, which is starting to seem as if it may have been ahead of a growing curve.

In the past few years, a number of schools across Wales and further afield have introduced total bans on mobiles. While Stanwell only asks pupils to keep phones switched off in their bags, others require the devices to be handed in at the start of the day.

Llanidloes High School in Powys is one which has implemented this policy in the past few years and Ysgol Penrhyn Dewi in St Davids, Pembrokeshire, followed suit at the start of this year.

Sarah Owen has been at Stanwell School since 2000 and says that there has always been a no phone policy in the school. For Sarah, it is a question not of trying to impinge on their students’ freedom, but of giving them vital time away from mobile life, for welfare as well as educational reasons.

“We genuinely believe this is in their best interests,” she said. “Phone addiction and screen addiction and scrolling, the loss of concentration, the loss of soft skills around listening and interacting with others, that’s something we need to be concerned about as a society generally.”

“We want children to be interacting with each other, having conversations, playing football, having those connections and interactions with other people.”

Sarah also believes it gives pupils relief from the possibility of being “photographed, filmed, mocked in some way – that’s not a nice way for children to live”. She said she wanted her pupils to have “some sanctuary from the anxiety of feeling so scrutinised and looked at”. 

Adapted from: https://www.bbc.com/news/articles