Network Security · Beginner

CIA goals, symmetric vs public key, hashes, signatures, HTTPS, firewalls, MITM, Caesar cipher, VPNs, DDoS and socket calls.

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Question 1 Security goals Beginner Practice

Which security goal does encrypting a message mainly provide?

Confidentiality – only the intended recipient can read it Integrity alone Non-repudiation Availability

Question 10 Cryptography Beginner Practice Code executed

A Caesar cipher shifts letters. What does this print?

Python main.py

def caesar(text, k):
    return ''.join(chr((ord(c) - 65 + k) % 26 + 65) for c in text)

c = caesar('NETWORK', 3)
print(c, caesar(c, -3))

QHWZRUN QHWZRUN NETWORK QHWZRUN QHWZRUN NETWORK KBQTLOH NETWORK

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