Want to make creations as awesome as this one?

Transcript

Décryptons la crypto

JPO - IUT du Limousin

département Informatique

Jeremy DRON & Alexandre Bourdarie

INDEX

1. Qu'est ce que la cryptologie?

2. La cryptologie et la sécurité informatique

3. La cryptologie: entre réalité et fiction

Qu'est ce que la cryptologie?

Pourquoi la cryptologie

Alice

Bob

Eve

Confidentialité, Authenticité et Intégrité

CryptographIE

CryptologIE

Cryptanalyse

Chiffrement de Cesa

CryptographIE

The key is a shift of the letters

Key = 3

Brut force attack

Cryptanalyse

Test all possibilies and compare the output

qebpbzobqjbppxdb
TheSecretMessage
wkhvhfuhwphvvdh

VIGeNERE's cipher

Cryptography

Message: Text
key: home

Output: ASJX

Kasiski's method

Cryptanalyse

Find recurring patterns and make a dictionary attack with words with a size of a multiple of the space between patterns

cryptology in everyday life

The authority of our
digital security

- Technology is at the service of the citizen

- Does not infringe on individual or public liberites
- Commission Nationale de l'Informatique et des Libertés

How it works ?

- Integrity -> Hash fonction

- Authenticity -> Signature mechanism
- Confidentiality -> Encryption

Encryption / Decryption

Each person with an email address has a pair of keys associated with that address

the field of health

The limits of cryptography in terms of its capacity
to preserve privacy raises questions

cryptology:
Between reality and fiction

Secret messages in the world

Love message
or
clue to the grail ?

XVIIIth century - Shugborought

Still life painting

1921 - C. BARREAU

Where is the secret message ?

The message is for his mistress Miss Martha

Sculture in front of the CIA

1990 - Krytos

Cryptology in the 7th art

A mystery murder at the Louvre museum. The professor Langdon is called for a stange message on the floor.

A. Turing a famous mathematician is called by UK authorities for help them to break enigma.

The Imitation Game

The Dr. Jhon Nash works to us secret services for decipher the messages from URSS in the newspapers

Conclusion

  • Is a really science with two sub-domains
  • It's use everyday
  • It is a field that fascinates the general public

THANKS