From the course: Learning Cryptography and Network Security
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Looking deeper into message digests
From the course: Learning Cryptography and Network Security
Looking deeper into message digests
- [Instructor] A hash function is a very versatile cryptographic tool. We have a number of different uses for a hash. With a hash, we can provide integrity. Now this ensures the message has not been modified in transit. And for this, we use a hash. We also can provide non-repudiation and accountability. Now this ensures that the message originated from the sender, and with this we use a digital signature. And we can also provide authentication, and this ensures the message originated from the sender, and with this we use a little different technique, we use the same shared key and a message authentication code. Now a hashed message authentication code is also called HMAC, and this is a way to check authentication. This verifies the source of the message. And this is going to use a message digest and the same shared secret key. Now this prevents a man-in-the-middle attack. For example, if you and another entity are…
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