Here again we see Bob and his correspondence to Alice. Bob's letter, labeled "Long message," reads:

Dear Alice:

This is a VERY long letter since there is so much to say...Bob

A blue arrow points downward from the letter to a mailbox, labeled "Package to send to Alice." A blue arrow also points rightward from the letter to a blue box labeled "Many-to-one hash function." A blue arrow points rightward from this box to a shorter letter, labeled "Fixed-length hash," and reading:

Opgmdvboijrtnsd

gghPPdogm;lcvkb

A blue arrow points vertically downward to a blue box labeled "Encryption algorithm." To the right of this box is Bob's private key, "K (-/B);" a blue arrow points leftward from the key to the encryption algorithm. A blue arrow points leftward from the encryption algorithm to a letter labeled "Signed hash," which reads:

Fgkopdgoo69cmxw

54psdterma[asofmz

A blue arrow points leftward from the signed hash to the mailbox.