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Read the reflection

Asymmetric Key Cipher

• Public key for encryption
• Private key for decryption

i.e. think of a padlock-able box - this is the public key.
The private key is the only thing which can open the box

RSA

Encrypt: plaintext^e % n = cipher

c^d % n = plaintext

Example question

e = 7, n = 33

The cipher text is: 26 72 41.

Solution

n = pq (p = 3, q = 11)

phi(n) = (p-1)(q-1)
= 2 * 5 = 10

d*e % phi(n) = 1

d*7 % 10 = 1

d = 3

Case Study

Ceate 5 recommendations to prevent similar incidents in the future.

Examples

• Prevent unauthorised
• Allow authorised
• Crew policies
• Are co-pilots required?
• Who can go in?
• Manufacture design
• Ground control? -> how about NO.

| How to get into the cockpit

1) Psychological assessment

2) Protocol

• Always at least two pilots in the cockpit
• External dual access to force the door entry
• Can only deadlock when two pilots are in the cockpit

3) Testing operational functionality

4) Private facilities for the cockpit crew

5) Hijack / Terrorist situation

• Silent alarm
• Honeypot unlock (possible notification to air traffic control)

6) If there is no response

• Override priority
• Override only works if there is no response from the cockpit after a timeout.

Other Groups' Response

• Dual keypad access
  • Two separate keys
• Passcode changes
• Psychological testing
• Private facilties
• Dual interaction to deny entry