Cryptography and identity Authentication Technology-- principles and practical applications of PKI & lt;2>

Understand and deploy symmetric encryption

1. Prepare symmetrical encryption mini software FatCryptoTool,office Password Recovery to crack the office password.

two。 Symmetrical encryption system:

Special encryption, high speed and high efficiency.

3. Data encryption Standard DES:

Lucifer-- "DEA--" ASNI

Features: 56-bit valid key, 8 check bits.

4. 3DES data encryption Standard

Note: it's more secure than DES, but it consumes three times as much.

5. AES Advanced encryption Standard

AES is a block cipher that supports a 128192256-bit key.

MARS: developed by the Lucifer algorithm team developed by IBM.

RC6: developed by RSA Lab.

Serpent: developed by Ross Anderson,ELi Biham and Lars Kndsen.

Twofish: developed by Counterpans System.

Rijndeal: developed by Joan Daemen and Vincent Rijmen. -"Select

Sensitive and unclassified.

6. International data encryption algorithm

IDEA is a block cipher that handles 64-bit arrays.

IDEA runs fast, but you have to pay for it.

7. Understanding Blowfish algorithm

Block cipher algorithm, 64-bit array, the key length can be 448 bits, after 16 rounds of encryption function to obtain ciphertext.

8. Understand RC4

One of the commonly used stream ciphers for SSL with variable key length.

The algorithm is simple, fast and effective.

9. Understand RC5 block cipher, its parameters, block size, key length and number of runs are also variable. Designed by Ron Rivest

And analyzed by RSA data Security Company. Supports 32pr 64128 bits, and the key length can be 2048 bits. 255 runs.

FatCryptoTool is easy to use:

1. download

two。 open

3. Add Resources

4. Encrypt