Symmetric and Asymmetric Encryption

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Presentation transcript:

Symmetric and Asymmetric Encryption Visit for more Learning Resources

Symmetric-key cryptography

Note In symmetric-key cryptography, the same key is used by the sender(for encryption) and the receiver (for decryption). The key is shared. Algorithm: DES,3DES

Symmetric-key cryptography Advantages: Simple Faster Disadvantages: Key must exchanges in secure way Easy for hacker to get a key as it is passed in unsecure way.

Figure 30.4 Asymmetric-key cryptography

Note An asymmetric-key (or public-key) cipher uses two keys: one private (To encrypt data) and one public(To decrypt data).

Asymmetric Key Cryptography (Public Key Cryptography) 2 different keys are used Users get the Key from an Certificate Authority Advantages More Secured Authentication Disadvantages Relatively Complex

Figure 30.6 Comparison between two categories of cryptography

Asymmetric encryption use two keys, one to encrypt the data, and another key to decrypt the data. These keys are generated together . One is named as Public key and is distributed freely. The other is named as Private Key and it is kept hidden. Both Sender & Recipient has to share their Public Keys for Encryption and has to use their Private Keys for Decryption.

How it WORKS…….?

Asymmetric encryption use two keys: Public Key - to encrypt the data Key Points in Asymmetric Encryption Asymmetric encryption use two keys: Public Key - to encrypt the data Private Key - to decrypt the data These keys are generated together. The Public key(s) is distributed freely between the sender and receiver. The other is named as Private Key and it is kept hidden. The Private Key is only used for Decryption and will not be shared between the sender and receiver.

Digital Signature Algorithm: Diffie-Helman:. Asymmetric Encryption Algorithms RSA: Digital Signature Algorithm: Diffie-Helman:. © 2013, Triad Square InfoSec Pvt. Ltd

MERITS & DE-MERITS Merits: Two parties don't need to have their private keys already shared in order to communicate using encryption. Authentication and Non-Repudiation are possible. (Authentication means that you can encrypt the message with my public key and only I can decrypt it with my private key. Non-repudiation means that you can "sign" the message with your private key and I can verify that it came from you with your public key.) De-Merits: Asymmetric Encryption algorithms are comparatively complex. Time consuming process for Encryption and Decryption. © 2013, Triad Square InfoSec Pvt. Ltd

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