![]() Let’s say that you are a particularly bad spy, and you and your headquarters decide to use a weak shift-cipher to encode your messages. The easiest way is to prearrange whichever type of code and key you plan on using beforehand, or to do it over a safe communication channel. The most common solution would be to encrypt the message with a code. ![]() How would you prevent your enemies from getting ahold of the message? Let’s say you’re a top secret spy and you need to send some important information to your headquarters. It may not seem so exciting or groundbreaking in the above terms, so let’s give an example that explains why the Diffie-Hellman key exchange was such an important milestone in the world of cryptography, and why it is still so frequently used today. ![]() The Diffie-Hellman key exchange was the first widely used method of safely developing and exchanging keys over an insecure channel. In this article, we’ll explain what it’s used for, how it works on a step-by-step basis, its different variations, as well as the security considerations that need to be noted in order to implement it safely. ![]() ![]() It allows two parties who have not previously met to securely establish a key which they can use to secure their communications. The Diffie-Hellman key exchange was one of the most important developments in public-key cryptography and it is still frequently implemented in a range of today’s different security protocols. ![]()
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