Bluetooth security
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Ain Shams University Faculty of Engineering. Integrated Circuits Lab. Bluetooth Security. Presented by: Mohammed Abdelsattar Ismail Sameh Talal Magd-El-Din Sameh Assem Ibrahim Ahmed Abdelhamid Saleh. -Overview -Blocks used -Weakness -Authentication -E 1 algorithm -Key handling

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Bluetooth Security

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Bluetooth security

Ain Shams University

Faculty of Engineering

Integrated Circuits Lab

Bluetooth Security

Presented by:

Mohammed Abdelsattar Ismail

Sameh Talal Magd-El-Din

Sameh Assem Ibrahim

Ahmed Abdelhamid Saleh


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG

Authentication

Encryption

  • Challenge-Response Scheme

  • SAFER+

  • Needed for encryption

  • Optional

  • Symmetric Stream Cipher

  • Negotiable Key Size

  • (8-128 bits)


Bluetooth security

PIN or Random Number

Random number

E2

E22

E21

Link Keys

Kunit or Kcombination

Kinit or Kmaster

E1

Authentication

Encryption

E3

Kcipher

E0

Kc

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG

  • PIN Number

  • Initialization Key

  • Unit Key

  • User Tracking


Bluetooth security

Challenge-Response Scheme:

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

The authentication function E1:

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

E3-Key generation function for encryption:

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

2)E22 mode:

# Utilized when creating initialization key and master key.

#It also uses the function A’r .

1)E21 mode:

# Utilized when creating unit key and combination key.

#It uses the function A’r .

E2-Key generation function for authentication:

It has two modes of operation:

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

Secure and Fast Encryption Routine

  • SAFER K-64 (1993) - Cylink Corporation

  • James L. Massay of ETH Zurich

  • SAFER+ was submitted as one of the candidates to AES 1998

  • Block size = 128 bits, key size = 128 , 192 or 256 bits

  • Bluetooth: Ar & Ar‘

  • 128 bits block, 128 bits key, 8 rounds, Encryption only

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG

Plaintext Block (16 bytes)

2 16-Byte

round subkeys

Encryption Round 1

2 16-Byte

round subkeys

Encryption Round 8

Output Transformation

1 16-Byte

subkey

Ciphertext Block (16 bytes)


Bluetooth security

Ar’

Diffusion

PHT(x,y) = 2x+y mod 256, x+y mod 256)

Confusion

Bit wise XOR – exponential – Addition mod 256

Addition mod 256 – logarithmic – Bit wise XOR

e: (45i mod 257) mod 256

l: I=e(j)

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

Bias words

Bp[I]=((45(4517p+I+1 mod 257)mod 257)mod 256)

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

KEY Scheduler

Controller

Encryption Round

Register

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


Bluetooth security

Bluetooth Standard

  • Hardware

LFSR

Non Repeating

  • 23 hr 18 min

  • 3.2 kHz

  • 28 bits

  • Serial

  • 128 bits

  • Parallel

Randomly Generated

Pseudo Random Number Generator

  • Software

-Overview

-Blocks used

-Weakness

-Authentication

-E1algorithm

-Key handling

-E3

-E2

-SAFER+

-Round

-Key Schedule

-Implementation

-Encryption

-modes

-Key Reduction

-Engine (E0)

-Timing

-PRNG


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