Symmetric and Asymmetric Encryption.ppt

Symmetric and Asymmetric Encryption.ppt

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  Symmetric and AsymmetricEncryption Visit for more Learning Resources
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  30.2 Symmetric-key cryptography
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  30.3 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 Note
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  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.
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  30.5 Figure 30.4 Asymmetric-keycryptography
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  30.6 An asymmetric-key (orpublic-key) cipher uses two keys: one private (To encrypt data) and one public(To decrypt data). Note
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  • Asymmetric KeyCryptography (Public Key Cryptography) – 2 different keys are used – Users get the Key from an Certificate Authority Advantages 1. More Secured 2. Authentication Disadvantages 1. Relatively Complex
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  30.8 Figure 30.6 Comparisonbetween two categories of cryptography
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  • Asymmetric encryptionuse 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.
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  How it WORKS…….?
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   Asymmetric encryptionuse 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. Key Points in Asymmetric Encryption
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  Asymmetric Encryption Algorithms RSA: DigitalSignature Algorithm: Diffie-Helman:. © 2013, Triad Square InfoSec Pvt. Ltd
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  Merits:  Two partiesdon'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. MERITS & DE-MERITS © 2013, Triad Square InfoSec Pvt. Ltd
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