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1

This particular prime has been widely used in implementations of the Internet Key Exchange Protocol (IKE) and commonly referred to as Group 5. Group 5 has been in many devices for over a decade. Depending on your viewpoint this fact is either good or bad. It's good if you are implementing IKE and want to interoperate with other implementations of IKE. It ...

3

From what I understood, data units are sectors, so a sector can have at most $2^{128}-2$ blocks but you can only encrypt $2^{20}$ blocks which cannot be correct (it seems too little compared to a disk's capacity). The data unit is the sector, yes, but both of those quotes only talk about the length of a single data unit. The larger number in the latter ...

24

Is this number specified anywhere? It was formally specified in this RFC as the 1536 bit MODP group (although its use predates that RFC). However, from what I've seen, the 2048 bit MODP group from that same document is actually more popular. Why was this particular number picked? Well, it's a safe prime; in addition, the leading 64 bits and the ...

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