Lamports Scheme

1
Lamports Scheme

• How do user and server synchronize on which
  password to use?
• h one-way hash function (e.g., MD5 or SHA-1)
• hn(k) h(h(h(...h(k)...)))

Server
User
n
Registration
secure channel
hn(k)
hn-1(k)
k
k