Minor quibble, but I think the "Key Pair" heading of the Definitions section mixes up i.e. (id est, 'that is') and e.g. (exempli gratia, 'for example'). Digita

Minor quibble, but I think the "Key Pair" heading of the Definitions section mixes up i.e. (id est, 'that is') and e.g. (exempli gratia, 'for example'). Digital signatures are one example of things you can do with a key pair, and it is specifically the public key that can't be used to recover the private key.