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That is, if the hashes of two messages match, than we get a high assurance that the messages are the same. Cryptographically useful hash functions must be one-way , which means that they should be easy to compute, but infeasible to reverse. An everyday example of a one-way function is mashing a potato; it its easy to do, but once mashed, reconstructing the original potato is rather difficult. A good hash function should be collision-resistant . It should be hard to find two different inputs that hash to the same value.

509 protocols.

Note: Inspired by the ″stamping″ idea, the IPSec architecture makes use of sequence numbers (instead of timestamps), to achieve replay protection. 2 Examples of Public-Key Algorithms Algorithms based on public keys can be used for a variety of purposes. Two common applications are: 1. 1, “ R S A Public Key A l g o r i t h m ” on page 28) 2. 2, “Diffie-Hellman Key Exchange” on page 29) The most popular public-key algorithm is the de-facto standard RSA , named after the three inventors: Ron Rivest, Adi Shamir and Leonard Adleman.

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