SSL/TLS Data Integrity and Authenticity

Questions and Answers

It encrypts the original data using the public key.

It generates a unique value that represents the original data. (correct)

It creates a digital signature from the original data.

It formats the data for transmission over the network.

By checking the length of the data received.

By encrypting the received data with their private key.

By contacting the sender to confirm the data.

By comparing the generated hash to the hash value in the digital signature. (correct)

A completely different hash value will be produced. (correct)

The digital signature remains unchanged.

The hash value generated will remain the same.

The public key will be rendered ineffective.

It encrypts the digital signature for the data. Signup and view all the answers

Digital signatures confirm that the data has not been modified during transmission. Signup and view all the answers

The verification process is halted and rejected. Signup and view all the answers

SHA-256 Signup and view all the answers

The private key kept secret by the sender Signup and view all the answers

Study Notes

SSL/TLS uses digital signatures and cryptographic hashing to ensure data integrity and authenticity.

Hashing:
- Utilizes cryptographic hash functions, such as SHA-256, to create a unique fixed-size hash value representing the original data.
Digital Signature Creation:
- The hash value is encrypted with the sender’s private key.
- This process generates a digital signature that verifies the sender's identity.

Receiving Data:
- The recipient receives the original message and its digital signature.
Hashing the Data:
- The recipient applies the same hash function to the received data to generate a hash value.
Decrypting the Signature:
- The recipient uses the sender's public key to decrypt the digital signature, retrieving the original hash value.
Comparison:
- The recipient compares the hash they generated with the decrypted hash from the digital signature.
- A match confirms that the data is untampered and the sender is authenticated.

Data Integrity:
- The unique hash value produced by the hashing function indicates that any alteration in the data results in a different hash value, allowing for detection of tampering.
Authentication:
- The digital signature verifies that the data originated from the legitimate sender, as only the sender with the private key can produce the signature.

Sender (Alice):
- Alice sends a message to Bob by creating a hash of the message and encrypting it with her private key to generate a digital signature before sending both to Bob.
Recipient (Bob):
- Bob obtains the message and signature, hashes the received message, decrypts the digital signature with Alice’s public key to retrieve the original hash, and compares both hashes.
- A match indicates the message's integrity and authenticity, affirming it is from Alice and has not been altered.