Course content

0.  Introduction and round of introductions

1.  Symmetric Encryption

• Kerckhoff's principle
• Storage and management of passwords
• How is encryption defined
• Definition: "What does secure mean?"
• Classification of attacks on encryption
• Definition of "Perfect Secrecy" and "Semantic Security"
• stream cipher
• Cryptographically secure random numbers
• block cipher Encryption modes (ECB, CBC, CTR, GCM, …)
• What is an "Initialization Vector"?
• key lengths Why padding?
• Motivation for Message Authentication Codes
• hash functions
• Message Authentication Codes (MACs)
• Authenticated Encryption
• Key generation and delivery
• key management
• Password-based key generation
• entropy
• Storage and management of passwords

2.  Asymmetric Encryption

• What is a "Public/Private Key" for?
• Brief introduction to mathematics relevant to number theory
• Differences to symmetric
• encryption Diffie-Hellman key exchange
• RSA
• DSA
• elliptical curves
• padding process
• key lengths
• key generation
• Again: "What does safe mean"?
• digital signatures
• Digression: logs

3.  TLS und PKIs

• TLS goals and introduction
• TLS – The Record Protocol
• TLS – The handshake protocol
• Encrypted records
• TLS best practices
• Certificates & PKI
• OCSP & CRLs