There are some currencies that focus heavily on the privacy aspect. The ones that come to mind are Monero, Dash and Zcash. They each tackle the problem in different ways, but ultimately they all have the goal of disallowing anyone from seeing the sender, receiver, or amount of a given transaction.
These protocols are also, last I checked, looking to enable normally sent transactions along their blockchain as well, but it's still their main focus to preserve your ability to be the only one fully aware of your actions.
I think these are all necessary, and it seems like IOTA also has some means of maintaining privacy, but I'm not sure how heavily anonymous The Tangle keeps its users. I wouldn't be surprised to see one or two coins experiment soon with a privacy-focused coin using a tangle instead of a blockchain, should IOTA gain steam.
We'll just have to see.
Those are actually the coins I'm most interested in, Dash is the only one I don't own or don't know that well. I didn't even know it was also privacy centric.
What I'm thinking of mainly is encryption of data and messages, which is where PGP and end-to-end encryption come in.
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