![]() The story of RSA is quite interesting, as it was first invented by an English mathematician, Clifford Cocks, who was however forced to keep it secret by the British intelligence office he was working for. ![]() One of the first ones is RSA, the creation of three brilliant cryptographers, that dates back to 1977. ![]() Since the invention of public-key cryptography, various systems have been devised to create the key pair. I believe that a minimum level of knowledge regarding the various formats of RSA keys is mandatory for every developer nowadays, not to mention the importance of understanding them deeply if you want to pursue a career in the infrastructure management world. You diligently followed the documentation on how to create SSH keys and after a couple of minutes your setup was complete.ĭo you know what the file ~/.ssh/id_rsa really contains? Why did ssh create two files with such a different format? Did you notice that one file begins with ssh-rsa, while the other begins with -BEGIN RSA PRIVATE KEY-? Have you noticed that sometimes the header of the second file misses the RSA part and just says BEGIN PRIVATE KEY? I bet you created at least once an RSA key pair, usually because you needed to connect to GitHub and you wanted to avoid typing your password every time.
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