Types of Cryptography

ZOhaib Ali

Feb 12, 2022

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Symmetric Key Cryptography

• Simplest kind of encryption technique
• Involves only One-key to encrypt & decrypt information
• Also called secret/private key cryptography
• This is faster
• Less complex and less computation is required
• Used in bulk data
• Sharing the key is a problem here
• E.g.: AES. DES. 2DES, 3DES, Blowfish, etc.

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Asymmetric Key Cryptography

• Uses 2 keys i.e. a pair of keys for encryption & decryption

1. Public Key (known to everyone)
2. Private Key (known to a particular person)

• Slower compared to symmetric
• Its more complex so, more computation power is required
• Used for secretly exchanging the secret key
• E.g.: Diffie-Hellman, RSA, DSA

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Hash Function

• No usage of key
• Takes input as variable size and gives fixed size output know as Hash code or value
• Many O.S. uses hash functions to encrypt passwords
• Ensures data integrity
• E.g.: SHA1, SHA-2

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