Cryptography

• IJCSET: A Comparison of Symmetric Key Algorithms
  • A COMPARISON OF SYMMETRIC KEY ALGORITHMS DES, AES, BLOWFISH, RC4, RC6: A SURVEY
• Wiki: Symmetric-key algorithm
• Symmetric Key Encryption: Why, Where and How it's Used in Banking
• WebCrypto Supported algorithms
• WebCrypto 支持算法

WebCrypto Operations

• sign()
• verify()
• encrypt()
• decrypt()
• digest()
• deriveBits()
• deriveKey()
• wrapKey()
• unwrapKey()

Symmetric Encryption Algorithms

对称加密算法包括:

• AES (Advanced Encryption Standard)
• DES (Data Encryption Standard)
• IDEA (International Data Encryption Algorithm)
• Blowfish (Drop-in replacement for DES or IDEA)
• RC4 (Rivest Cipher 4)
• RC5 (Rivest Cipher 5)
• RC6 (Rivest Cipher 6)

两类对称加密算法:

1. Block algorithms: Set lengths of bits are encrypted in blocks of electronic data with the use of a specific secret key. As the data is being encrypted, the system holds the data in its memory as it waits for complete blocks.
2. Stream algorithms: Data is encrypted as it streams instead of being retained in the system’s memory.

AES, DES, IDEA, Blowfish, RC5 and RC6 are block ciphers. RC4 is stream cipher.

Key Algorithms

• AES (Advanced Encryption Standard)
  • Supersedes DES.
  • Block size: 128 bits.
  • Key lengths: 128, 192, 256 bits.
  • Wiki: Advanced Encryption Standard
  • Wiki: Block cipher mode of operation
• DES (Data Encryption Standard)
  • 64-bit cipher, considered weak.
  • 3DES (Triple DES) still used in EMV chip cards but not recommended by NIST.