Conditions:

The password entered to validate the authenticity of a person is visible to everyone. The password must be different the next time entered.

Proposal:

An automatic password changing mechanism system that changes upon each use allowing the user to publicly enter or grant one time access to anything.

Solution:

E(x,y) -> C D(x,C) -> y Where

• E(x,y) means encryption of x,y
• D(x,C) mans decryption of x,C
• x is seed password(can be anything)

• y is salt or a Pseudo random generated recorded string to randomize entry

• Recursive One way hash One way hash of the seed password is recursively hashed to a certain number of times to yeild C_n where the seed password has been hashed n number of times.

Usage:

C<sub>n</sub> has to be parsed to the server to authenticate and verify the identity of the person.
Upon being authenticated once, C<sub>n-1</sub> needs to be parsed to the server to authenticate and verify the identity of the person for the second time.

Resources:

• Bruce ‘s book introduction to applied cryptography