The author of this ticket isn't exaggerating when he states that "MITMing this crawling horror would be no more difficult than a plain, unencrypted TCP connection".

That's how bad it is.

He might be right but he still went about it in the wrong way.

Any way to download and read this on linux ?

Don't know about download but you can read it online using Amazon Cloudreader.

Download is easy enough, just click the transfer via usb option, and it'll download a .azw file. You can't read it without stripping out the DRM first, but that's not very hard either.

Didn't saw that option. Maybe only available to those who have registered a Kindle device.

40 bit key length for RSA is just trolls. 768 bit keys have already been cracked, so you could probably crack these with a calculator.

Just tried it and Ti-89 breaks 40 bit RSA keys in about 6 seconds.