Fast arithmetic

nistp224

Blurbs

With nistp224, sharing secrets is a snap.
Alice creates a random 28-byte `SECRET.alice` file and runs

cat SECRET.alice PUBLIC.base | nistp224 > PUBLIC.aliceto create her 28-byte public key

cat SECRET.alice PUBLIC.bob | nistp224and Bob can run

cat SECRET.bob PUBLIC.alice | nistp224to produce the same output, a 28-byte secret shared by Alice and Bob. Alice and Bob can use this shared secret as a key to authenticate and encrypt their messages. It seems to be extremely difficult for an eavesdropper to figure out the shared secret given

nistp224 also supports uncompressed Diffie-Hellman key exchange on the same curve, with 56-byte public keys, at slightly higher speeds.