Communication in automatic teller machine (atm)

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