Challenge Response Authentication
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This document discusses challenge-response authentication and covers its definition, ways of authentication using symmetric-key ciphers, keyed-hash functions, asymmetric-key ciphers, and digital signatures. It provides figures to illustrate challenge-response authentication using a nonce, timestamp, keyed-hash function, asymmetric-key cipher, and digital signature. The key ways discussed are proving knowledge of a secret without revealing it directly and authenticating using a nonce, timestamp, or digital signature to preserve the integrity of challenge and response messages.
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Challenge Response Authentication
- 2. My topics is Challenge Response Authentication
- 3. Topics to be covered • Definition • Ways of Authentication • Summery of the topics
- 4. Definition The claimant proves that she knows a secret without revealing it.
- 5. Ways of Authentication • Using a Symmetric-Key Cipher • Using Keyed-Hash Functions • Using an Asymmetric-Key Cipher • Using Digital Signature
- 6. Using a Symmetric-Key Cipher These also happened in two stages i. authentication using a nonce ii. authentication using a timestamp.
- 7. Fig: Challenge response authentication using a nonce Using a nonce
- 8. Fig: Challenge-response authentication using a timestamp. Using a timestamp
- 9. Using Keyed-Hash Functions Fig: Challenge-response using a keyed-hash function
- 10. There are two advantages to this scheme i. Encryption/decryption algorithm is not exportable to some countries. ii. We can preserve the integrity of challenge and response messages
- 11. Using an Asymmetric-Key Cipher Fig: Challenge-response using an Asymmetric-Key Cipher
- 12. Using Digital Signature Fig: Challenge-response using Digital Signature.
- 13. Remember these again • Ways of Challenge Response Authentication
- 15. Thanks for being with Me