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level: Certificates and signatures

Questions and Answers List

level questions: Certificates and signatures

QuestionAnswer
Describe how digital signature are obtained1. A digest of the message is created 2. This digest is encrypted with the sender’s private key 3. The encrypted digest is appended to the message. This is the signature as it can only have come from the sender 4. Whole thing is encrypted with receivers public key
Describe how digital certificates are obtainedIssues by an official certificate authroity (CA)
Why is a digital signature usedMake sure sent message has not been altered with in transit
What does a digital certificate doVerifies ownership of a key pair used in asymmetric encryption
What do digital certificates containA serial number The owner’s name An expiry date The owner’s public key The certificate authority’s digital signature.
Describe the process of receiving a signatured messageHint: 1. A digest of the message is created 2. This digest is encrypted with the sender’s private key 3. The encrypted digest is appended to the message This is the signature as it can only have come from the sender 1. Decrypted with senders private key 2. Digital signature is decrypted with senders public key 3. Message digest is regenerated by applying the hash function to the plaintext message 4. Message digest from digital signature is compared with regenerated message digest 5. If they are the same then the message is secure and untampered with