1. Cryptography Fundamentals
Author : Ammar Hasayen
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Presentation: Cryptography Fundamentals
Version : 1.0
Duration : 30 minutes
Written on Feb 2014
Note: Feel free to use this presentation at your side.
Ammar Hasayen

2. Back in time

3. SPARTANS MILITARY (GREEKS)
kryptos
gráphō
hidden
writing
Cryptography

4. Before and after

5. How things worked before
Corporate walls
Badges
Face to Face
Paper work
Confidentiality
Authenticity
Trust
Delivery
Historically speaking, all work is done inside corporate walls. Investments were in secure walls, physical security and security cameras.
Identity is identified by corporate badges. The badge contains the person’s name, picture and perhaps his role in the corporate.
Most interactions were face to face, so authenticity was achieved by identifying people faces and badges.
Most of the work was paper work and lot of archives.
Confidentiality were archived by stamping papers as confidential and may be secure them in a closed room.
Authenticity were archived by manual signatures or stamps.
Trust is hard to achieve as you have to trust the signature in the paper or the badge that people are wearing.
If you want to move papers around, you have to trust the courier.

6. Digital Collaboration
How things working Now
World is the limit
Digital ID
Virtual Team
Digital Collaboration
Anywhere
BYOD
Wireless
Nowadays, the world is the limit. You are dealing with people who you do not know or did not meet before. Corporates are big, and within the same corporate, you are exchanging information with people you do not know.
Virtual teams are popular know. Teams do not have to be physical located in the same room or floor.
Digital Collaboration with , IM, Conferencing and Chat rooms are the way to communicate inside corporates.
All this push the need to define a solid and secure digital identity that your business can depend on as a platform for all digital collaboration and transactions.
Even worst, People are working from home, internet cafes and while traveling. The need to provide secure remote access has never been urgent as nowadays.
BYOD (Bring Your Own Device) is another concern. You can see people with more than device, and synching corporate from different devices, and may be doing VOIP calls from another.
Wireless is everywhere, and securing wireless network is a must. You need a way to authenticate the access point to avoid wireless attacks.
And finally, everyone is paying online, credit cards information should be transmitted securely and stored securely.
E-transactions

7. C.I.A
Confidentiality
Integrity
Authenticity

8. Confidentiality Encryption….
Confidentiality Encryption

9. Encryption – via Key Symmetric Encryption Key (K) Encrypted Message
Encryption Algorithm
Encrypted
Message
Message
Symmetric
Encryption
Key (K)

10. Encryption – Current Standards
AES
DES
3DES

11. ….
Integrity Hashing

12. Changing Content Key (K) Encrypted Message Message
Encryption Algorithm
Hack
Encrypted
Message
Message
Key (K)
2 aspirin /day
20 aspirin /day

13. Integrity via Hash Unique Message Hash Value 001001001 111001110
Hash Algorithm
Unique
Hash Value
Message
We are all
Moath
Hash Algorithm
Wee are all
Moath
Hash Algorithm

14. Complete Solution Encrypted Message Message Unique Hash Value
Encryption Algorithm
Encrypted
Message
Key (K)
Message
Hash
Algorithm
Unique
Hash Value

15. Key (K) Message Encrypted Message Unique Hash Value Unique Hash Value
Encryption Algorithm
Message
Encrypted
Message
Hash Algorithm
Key (K)
Unique
Hash Value
Unique Hash Value

16. Hash – Current Standards
MD5
SHA-2
SHA1

17. ….
Thank You