What is Cryptography | Cryptography Explained | Cryptography Basics | Intellipaat
Summary
TLDRCryptography is the study of secure communication techniques that protect data by ensuring only the sender and intended recipient can access the message's content. It encompasses three types: symmetric cryptography (same key for encryption and decryption), asymmetric cryptography (using a public and private key pair), and hash functions (irreversible one-way functions). The main objectives of cryptography include confidentiality, non-repudiation, integrity, and authenticity. Cryptography safeguards data in transit and at rest, protects against unauthorized access, and ensures secure communication, preventing eavesdropping and alteration.
Takeaways
- 😀 Cryptography is the study of secure communication techniques that ensure only the sender and intended recipient can read the message.
- 😀 The term 'cryptography' originates from the Greek word 'kryptos,' meaning 'hidden.'
- 😀 Encryption is the process of transforming plain text into cipher text and then back to its original form.
- 😀 There are three main types of cryptography: symmetric, asymmetric, and hash functions.
- 😀 In symmetric cryptography, the same key is used for both encryption and decryption.
- 😀 Asymmetric cryptography uses a pair of keys: a public key for encryption and a private key for decryption.
- 😀 Hash functions are one-way, irreversible functions that convert variable-length strings into fixed-length strings.
- 😀 The four main objectives of cryptography are confidentiality, non-repudiation, integrity, and authenticity.
- 😀 Cryptography protects data both in transit and at rest, ensuring confidentiality and security.
- 😀 SSL and TLS cryptographic technologies provide confidentiality, integrity, and protection against malicious eavesdropping and alterations.
- 😀 Cryptography prevents sensitive data from being deciphered and ensures system communication security.
Q & A
What is the definition of cryptography?
-Cryptography is the study of secure communication techniques that allow only the sender and the intended recipient of a message to read its content. The term comes from the Greek word 'kryptos,' meaning hidden.
How does cryptography relate to encryption?
-Cryptography is closely linked to encryption, which is the process of scrambling plain text into cipher text and then back again when it's received. Encryption is a key component of cryptography used to secure communications.
What are the three types of cryptography?
-The three types of cryptography are symmetric cryptography, asymmetric cryptography, and cryptography using hash functions.
What is symmetric cryptography?
-In symmetric cryptography, the same key is used for both encryption and decryption. Both the sender and recipient must have access to the same common key.
How does asymmetric cryptography work?
-Asymmetric cryptography uses two separate keys for encryption and decryption. A public key can encrypt a message, and only the intended recipient can decrypt it with their private key.
What role do hash functions play in cryptography?
-Hash functions are one-way, irreversible functions that safeguard data while preventing the recovery of the original message. They are used to convert a variable-length string into a fixed-length string.
What are the main objectives of cryptography?
-The main objectives of cryptography are confidentiality, non-repudiation, integrity, and authenticity.
How does cryptography ensure confidentiality?
-Cryptography ensures confidentiality by keeping both data in transit and data at rest secure and private. It protects information from unauthorized access.
What does non-repudiation mean in cryptography?
-Non-repudiation ensures that the sender cannot deny sending a message, and the recipient cannot deny receiving it. This is achieved through authentication methods like digital signatures.
How does cryptography ensure data integrity?
-Cryptography ensures data integrity by using methods like encryption and hashing to verify that data has not been altered during transmission or storage.
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