I understand their general purpose but not why that xkcd strip is funny. 
What are people using them for, why post your public key? I've encountered 
public/private key use for encryption a couple times, and it wasn't funny. 

On Sunday, August 16, 2015 at 11:16:58 AM UTC-4, Jacob Peck wrote:
>
> On 8/16/2015 11:11 AM, Edward K. Ream wrote:
>
> On Sat, Aug 15, 2015 at 7:52 PM, john lunzer <[email protected] 
> <javascript:>> wrote:
>
>> I don't get it (even after doing research), I'm definitely not cool 
>> enough for the internet, but xkcd often makes me feel like an inferior life 
>> form.
>>
>
> ​Private keys must remain private. Otherwise, anyone could read what you 
> have encrypted.
>
> Or, worse, anyone could encrypt or sign something and have it appear to 
> all the world that you did it (thus the hover text). Private key = identity 
> in many cases.
> -->Jake
>
> EKR
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