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Symmetric Encryption

Name a weakness of symmetric encryption
Have to use the same key
Key exchange
Which of these are symmetric algorithms?
Advanced Encryption Standard
RSA
Triple DES
Triplefish
Twofish
Blowfish
Diffie-Hellman
Which is stronger?
Secure communication channel based on SSL 3.0/TLS 1.0
Programmed encryption solution
Should you reuse an initialization vector?
No way
Sometimes
In most cases
How does CBC work?
Every clear text block is XORed one bit at a time with the preceding cipher text block before it is encrypted
By streaming the encryption mechanism
What does CBC stand for?
Cipher Block Chaining
Complete Bit Cipher
What does PKCS represent?
Public Key Cryptography Standards
Prime Key Combination Software
Which of these is related to PKCS #7?
Pads the last clear text block which is to be encrypted to the block size on which the algorithm is based
Defines a platform-independent API to cryptographic tokens
Cryptographic Message Syntax Standard
Elliptic Curve Cryptography Standard
Bad symmetric algorithm example?
AES-256
DES
RC5
Which performs encryption faster?
TripleDES
AES
Which is recommended by Bruce Schneier?
Twofish
Blowfish
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