Encryption at rest and in transit in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the encryption method used for data stored on disk.

HLD

storage_config = {"encryption": "[1]"}

Drag options to blanks, or click blank then click option'

ABase64

BSHA-256

CMD5

DAES-256

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing hashing algorithms like SHA-256 or MD5 instead of encryption.

The standard encryption method for data at rest is AES-256, which provides strong symmetric encryption.

2fill in blank

medium

Complete the code to specify the protocol used to secure data during transmission.

HLD

network_config = {"protocol": "[1]"}

Drag options to blanks, or click blank then click option'

AFTP

BTLS

CHTTP

DSMTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing unencrypted protocols like HTTP or FTP with secure ones.

TLS (Transport Layer Security) is the standard protocol to encrypt data in transit, ensuring confidentiality and integrity.

3fill in blank

hard

Fix the error in the code that incorrectly uses a hashing function for encrypting data at rest.

HLD

encryption_method = "[1]"  # Incorrect for encryption at rest

Drag options to blanks, or click blank then click option'

AAES-256

BRSA

CMD5

DSHA-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using hash functions instead of encryption algorithms.

Hash functions like SHA-1 and MD5 are not encryption methods. AES-256 is a proper encryption algorithm for data at rest.

4fill in blank

hard

Fill both blanks to complete the configuration for encrypting data at rest and in transit.

HLD

config = {"at_rest": "[1]", "in_transit": "[2]"}

Drag options to blanks, or click blank then click option'

AAES-256

BTLS

CHTTP

DMD5

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up encryption and hashing algorithms.

Data at rest should be encrypted with AES-256, and data in transit should be secured with TLS.

5fill in blank

hard

Fill all three blanks to complete the security setup for data encryption and integrity verification.

HLD

security = {"encrypt_at_rest": "[1]", "encrypt_in_transit": "[2]", "integrity_check": "[3]"}

Drag options to blanks, or click blank then click option'

ARSA

BTLS

CSHA-256

DAES-256

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing encryption with hashing for integrity.

AES-256 is used for encrypting data at rest, TLS for encrypting data in transit, and SHA-256 for verifying data integrity.

Practice

1. What is the main purpose of encryption at rest in system design?

easy

A. To protect stored data from unauthorized access

B. To speed up data transmission over the network

C. To compress data for storage efficiency

D. To authenticate users before accessing the system

Solution

1. Step 1: Understand encryption at rest

   Encryption at rest means encrypting data when it is stored on disks or databases to prevent unauthorized access.

2. Step 2: Identify the main goal

   The main goal is to protect stored data from being read by unauthorized users if the storage is compromised.

3. Final Answer:

   To protect stored data from unauthorized access -> Option A

4. Quick Check:

   Encryption at rest = Protect stored data [OK]

Hint: Encryption at rest means securing stored data only [OK]

Common Mistakes:

• Confusing encryption at rest with encryption in transit
• Thinking encryption at rest speeds up data
• Mixing encryption with user authentication

2. Which of the following is the correct protocol used for encryption in transit?

easy

A. AES-256

B. TLS (Transport Layer Security)

C. SHA-256

D. RSA key exchange

Solution

1. Step 1: Identify encryption in transit protocols

   Encryption in transit protects data moving over networks. TLS is the standard protocol for this purpose.

2. Step 2: Differentiate options

   AES-256 is a symmetric encryption algorithm (used for data at rest), SHA-256 is a hash function, RSA is an encryption algorithm but not a protocol for transit encryption.

3. Final Answer:

   TLS (Transport Layer Security) -> Option B

4. Quick Check:

   Encryption in transit = TLS protocol [OK]

Hint: TLS is the standard for encrypting data in transit [OK]

Common Mistakes:

• Confusing encryption algorithms with protocols
• Choosing AES or RSA as transit protocols
• Mixing hash functions with encryption

3. Consider a system where data is encrypted with AES-256 before storage and TLS is used for network communication. What is the main benefit of this design?

medium

A. Data transmission speed is maximized

B. Only stored data is protected, transmission is not

C. Data is protected both when stored and when transmitted

D. Encryption is only applied to user passwords

Solution

1. Step 1: Analyze encryption at rest with AES-256

   AES-256 encrypts data stored on disk, protecting it from unauthorized access.

2. Step 2: Analyze encryption in transit with TLS

   TLS encrypts data moving over the network, preventing interception or tampering.

3. Step 3: Combine both protections

   Using both means data is secure when stored and when sent, covering both attack surfaces.

4. Final Answer:

   Data is protected both when stored and when transmitted -> Option C

5. Quick Check:

   AES-256 + TLS = Full data protection [OK]

Hint: AES for storage + TLS for network = full data protection [OK]

Common Mistakes:

• Assuming TLS speeds up transmission
• Thinking encryption only protects passwords
• Ignoring encryption in transit

4. A developer implemented encryption in transit using HTTP instead of HTTPS. What is the main issue with this approach?

medium

A. Data is not encrypted during transmission

B. Data is encrypted but stored insecurely

C. Encryption keys are exposed in the database

D. Data is encrypted only at rest, not in transit

Solution

1. Step 1: Understand difference between HTTP and HTTPS

   HTTP transmits data in plain text, while HTTPS uses TLS to encrypt data in transit.

2. Step 2: Identify the problem with using HTTP

   Using HTTP means data is sent unencrypted, vulnerable to interception and attacks.

3. Final Answer:

   Data is not encrypted during transmission -> Option A

4. Quick Check:

   HTTP = no encryption in transit [OK]

Hint: HTTP sends data unencrypted; HTTPS encrypts it [OK]

Common Mistakes:

• Confusing encryption at rest with in transit
• Assuming HTTP encrypts data
• Thinking keys are exposed due to HTTP

5. You are designing a cloud storage system that must comply with strict security standards. Which combination best ensures data confidentiality both when stored and when accessed remotely?

hard

A. Encrypt data only during transmission using SSL 2.0

B. Use SHA-256 hashing for stored data and HTTP for data transfer

C. Store data unencrypted and rely on VPN for secure access

D. Encrypt data at rest with AES-256 and use TLS 1.3 for all client-server communication

Solution

1. Step 1: Identify strong encryption for data at rest

   AES-256 is a widely accepted strong encryption standard for stored data.

2. Step 2: Choose secure protocol for data in transit

   TLS 1.3 is the latest secure protocol for encrypting data during transmission, better than older SSL versions.

3. Step 3: Evaluate other options

   SHA-256 is a hash, not encryption; HTTP is unencrypted; VPN alone does not encrypt stored data; SSL 2.0 is outdated and insecure.

4. Final Answer:

   Encrypt data at rest with AES-256 and use TLS 1.3 for all client-server communication -> Option D

5. Quick Check:

   AES-256 + TLS 1.3 = Best practice for confidentiality [OK]

Hint: Use AES-256 for storage and TLS 1.3 for transmission [OK]

Common Mistakes:

• Using outdated SSL instead of TLS
• Confusing hashing with encryption
• Relying only on VPN without encryption