1 / 15

Identity Based  Cryptography

Identity Based  Cryptography. James Higdon, Sameer Sherwani CpSc 624/424. Overview. Type of encryption mechanisms Types of encryptions Basic Identity based encryption Advantages Disadvantages Applications. Encryption.

jillian-bernard
Download Presentation

Identity Based  Cryptography

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Identity Based  Cryptography James Higdon, Sameer Sherwani CpSc 624/424

  2. Overview • Type of encryption mechanisms • Types of encryptions • Basic Identity based encryption • Advantages • Disadvantages • Applications

  3. Encryption  - process of transforming information(plaintext) using a cipher (algorithm) to ciphertext. 

  4. Types of cryptographic mechanisms •  Key Authentication  • One way hash functions: MD5, SHA • Digital signatures: Verify user: DSA   •  Key exchange •  key distribution: Diffi-Hellman  •  Key generation •  Block Ciphers: DES/AES; ATM, passwords

  5. Types of keys(ciphers) • Symmetric keys • Traditional asymmetric keys  • Identity-based asymmetric keys •  Common public-key Algorithms  • ( RSA, Elliptic curve, Discrete logarithm based)  •  Explain difference between traditional and Identity based asymmetric keys

  6. Symmetric Encryption

  7. Asymmetric Encryption(Public Key Infrastructure - PKI)

  8. ID-based Encryption

  9. Identity based Encryption(IBE)   "identity-based"...  mainly about keys  The major differences between an identity-based  system and a traditional system are •  How to authenticate the key •  How to distribute the key •  How to use the key 

  10. Identity based Encryption(IBE) • A public-key encryption system in which an arbitrary string can be used as the public key. • Any personal information: • An e-mail address, a photo, and a postal address, etc • Any terms and conditions, such as a time etc • Developed by Adi Shamir in 1984 • However, the encryption schemes were not fully used or created until 2001.

  11. How it works • Private Keys are generated by a third party Private Key Generator (PKG) • PKG publishes a public master key and retains the private master key • With the correct ID, users can contact the PKG to obtain the private key • This way, messages may be encrypted without a prior distribution of keys between individuals 

  12. Advantages Reduces the complexity of the encryption process  • No certificates needed. A recipient's public key is derived from his identity. • No pre-enrollment required. • Keys expire, so they don't need to be revoked. In a traditional public-key system, keys must be revoked if compromised. • Less vulnerable to spam. • Enables postdating of messages for future decryption. • Enables automatic expiration, rendering messages unreadable after a certain date.

  13. Disadvantages • Requires a centralized server. IBE's centralized approach implies that some keys must be created and held in escrow -- and are therefore at greater risk of disclosure. • Requires a secure channel between a sender or recipient and the IBE server for transmitting the private key.

  14. Real-World Application • Voltage Security provide Identity-Based Encryption for emails • IBE Toolkit available to those who would like to use the encryption services 

More Related