Date post: | 22-Dec-2014 |
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Education |
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Communication in Automatic Teller Machine
(ATM)
Knowing in Automatic Teller Machine (ATM)
A block diagram of an ATM
Hardware
ATM hardware that we often use in our life
Software
VS.
Software
Linux Penguin-OS on ATMs in Brazil
Bank of Philippine running Windows XP OS
State-Chart for One TransactionGetting Specifics
Sending to Bank
Handling Invalid Pin
Completing Transaction
Printing Receipt
Asking if customer wants another
Cancelled
Specifics entered
Disapproved(except invalid PIN)
ApprovedInvalid PIN
Approved
CancelledNot Cancelled
Too manyInvalid PINs
Disapproved(except invalid PIN)Or Cancelled
ATM Transaction Processing
Provider
Data Center
TANDEM Core Branch
- GPRS- 3G- ADSL
Encryption
Encryption
Encryption
ATM Machine
Encryption = 3DES or AES-256bits
Branch = AES-256bits
ATM Machine = 3DES
Disaster Recovery Site
Encryption Encryption
Encryption
Normal Connection
Backup Connection
Branch Transaction Processing
Provider 1
Data Center
TANDEM Core Branch
Encryption
Encryption
Encryption = 3DES or AES-256bits
Branch = AES-256bits
ATM Machine = 3DES
Disaster Recovery Site
Encryption Encryption
Encryption
Branch
Provider 2
MPLS L2 (Speed 512-1024kbps)
MPLS L1 (Speed 512-1024kbps)
Normal Connection
Backup Connection
DDN (Digital Data Network)
• Point to point
• Accuracy
• Fast
• Secure
• Backup Connection
• High ROI
• High cost (compare to other technologies)
DDN Applications
DSU/CSU
DSU/CSU
DSU/CSU
DSU/CSU
Router
PC
PC
PC
Mainframe
ATM Machine
Telepresence
DDN LAN
MPLS VPN (Multi Protocol Label Switching Virtual Private Network)
• Point to point, Point to multi-point
• VPN
• Leverage existing ATM hardware
• Ultra fast forwarding
• IP Traffic Engineering
• Constraint-based Routing
• Controllable tunneling mechanism
• Voice/Video on IP
• QoS constraints
• Cost effective (compare to other technologies)
MPLS
Branch 1
Branch 6
Branch 2
Branch 3
Branch 4
Branch 5
MPLS VPN
Most bank in Thailand use 512-1024kbps links speed.
DDN vs. MPLS
Feature DDN MPLS
Connection Type Point to Point Point to Point, Point to Multi-Point
Disaster Recovery Link
No Yes
VPN Ability No Yes
Price High* Low**Compare to other technologies
3DES (Triple Data Encryption Algorithm)
• Most widely used algorithm
• Pioneered by IBM
• It is symmetric crypto system
• Developed to protect sensitive, unclassified, US government, Computer data.
• Used to provide authentication of electronic funds transfer messages.
AES-256bits (Advanced Encryption Standard)
• Designed simple
• Low memory cost
• High speed algorithm
• The key used to decrypt and encrypt is same
• Cipher text and plain text are same size
• Fast both in Software and Hardware
AES-256bits vs. 3DES**Feature AES 3DES
Description Advanced Encryption Standard
Triple Data Encryption Standard
Timeline Official standard since 2001
Standardized 1997
Type of algorithm
Symmetric Symmetric
Key size (bits) 256 168
Speed High Low
Time to crack (assume a machine could try 255 key per second - NIST)
149 trillion years
4.6 billon years
Resource consumption
Low Medium
**“AES can encrypt data much faster than Triple-DES, a DES enhancement which essentially encrypts a message or document three times.”
Q&A