Lecture 3.1: Handling Remote Access: RADIUS Motivation
Lecture 3.1: Handling Remote Access: RADIUS Motivation
Lecture 3.1: Handling Remote Access: RADIUS Motivation
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MD5 and hash backgrounds<br />
(briefly briefly)<br />
Giuseppe Bianchi<br />
Giuseppe Bianchi<br />
Hash Function<br />
Y = H(X)<br />
Any length message X<br />
Fixed size digest Y<br />
Cannot be inverted, as not unique e.g. 128 bits for MD5<br />
X = x bits<br />
Y = y bits<br />
Assuming ideal mapping, Y is the result for 2x-y possible X messages<br />
Example:<br />
x=5 bits 32 messages<br />
y=2 bits 4 digests<br />
32/4 = 8= 23 10
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