Transcript ALGORITHM SHA-1 PROJECT : – Hoel NAUDY Guillaume ZMUDA

Guillaume ZMUDA – Hoel NAUDY
PROJECT :
ALGORITHM SHA-1
Plan
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Introduction
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Why this subject ?
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About this subject
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Definition
Applications
Flash Animation
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The difficulties we have met
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What we learned ?
Introduction
The subject was to create a flash animation
about the SHA-1 algorithm.
For our researches we used most exclusively
the Internet. We found some explanations and
some sources ( sha1.c and sha1.h) to codify a
sentence.
Why this subject ?
At first we wanted to choose a project on the
satellite Galileo but we did not find enough
technical data.
We could only find economical or political data
on this matter (what it would cost and the
advantage on the GPS system).
So we decided to choose a subject about
cryptographic function , the SHA-1 algorithm.
Definition
SHA-1: Secure Hash Algorithm
It is a algorithm that is used in cryptography to
make information confidential.
It produces a 160-bit digest from a message with a
maximum size of 2^64 bits.
For example, The hash of the zero-length string is:
SHA1(" ") =
da39a3ee5e6b4b0d3255bfef95601890afd80709
Definition
A hash function takes a long string (or message)
of any length as input and produces a fixed length
string as output.
Applications
SHA-1 is employed in a large variety of popular
security applications and protocols.
This algorithm is one of the required secure
hash algorithms used for the protection of
sensitive unclassified information.
SHA-1 is used by Digital Signature Standard
(DSS), which is a standard used for digitally
signing documents or other data.
Flash Animation
Our project includes to make a macromedia
flash animation.
We are creating a menu task with links to
navigate from one page to a another one. It
allows us to join the menu whenever we want.
The difficulties we have met
• Many of the data we found described the
collisions of the SHA-1(a pair of messages which
share the same digest).
• For our project we had to create the Macromedia
Flash animation and so we had to learn how to
use it.
What we learned ?
• We had a little sight a the big area of the
cryptographic world and it was quite interesting.
• We discovered as well what the SHA-1 algorithm
was.
• It was possible for us to improve our English
level during our work.
• We learned how to use the Macromedia Flash
software.