A5/1

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

A5/1 is a stream cipher used to provide over-the-air communication privacy in the GSM cellular telephone standard. It is one of several implementations of the A5 security protocol. It was initially kept secret, but became public knowledge through leaks and reverse engineering.

Excerpt from the Wikipedia article “A5/1”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Original: Matt Crypto Vector: Tsaitgaist, Public domain, via Wikimedia Commons.