CREST CPSA Questions with Complete
Solutions
What is obfuscation? The purpose of obfuscation is to make something harder to
understand, usually for the purposes of making it more difficult to attack or to copy.
What is symmetric encryption? An encryption method in which the same key is used to
encrypt and decrypt the data.
What is asymmetric encryption? An encryption method in which two keys (one private,
one public) are used to encrypt and decrypt a message.
Vunerable hashing algorithms MD5, Sha-1, NTLM, LanMan.
Eny Symmertric algorithms. > DES
> 3DES (or Triple DES)
> RC4
> RC5
> AES (aka Rijndael)
,> Blowfish
> Serpent
> Twofish
> CAST5
> IDEA
Eny Asymmertric algorithms. > Elliptic curve
> RSA
> Diffie-Hellman
> DSA
> Key serialization
> ELGAMAL
What is a hash collision? A Hash Collision Attack is an attempt to find two input strings
of a hash function that produce the same hash result.
Because hash functions have infinite input length and a predefined output length, there is
inevitably going to be the possibility of two different inputs that produce the same output hash.
, What is Ipsec. Internet Protocol Security (IPsec) is a secure network protocol suite that
authenticates and encrypts the packets of data sent over an Internet Protocol network.
What are two modes of operation for IPsec. Host-to-Host and Tunnelling mode.
What does IKE stand for? Internet Key Exchange
What does the linux file permission of 777 mean everyone(owner, group, users) has read
write and excuate of the file.
What is the definition of ACL? Access control list.
Common tool used on Microsoft operating system for managing process. Task Manager.
Where is the SAM file located? C:\Windows\System32\drivers\etc\lmhosts.sam
What is an AS system. autonomous system
Solutions
What is obfuscation? The purpose of obfuscation is to make something harder to
understand, usually for the purposes of making it more difficult to attack or to copy.
What is symmetric encryption? An encryption method in which the same key is used to
encrypt and decrypt the data.
What is asymmetric encryption? An encryption method in which two keys (one private,
one public) are used to encrypt and decrypt a message.
Vunerable hashing algorithms MD5, Sha-1, NTLM, LanMan.
Eny Symmertric algorithms. > DES
> 3DES (or Triple DES)
> RC4
> RC5
> AES (aka Rijndael)
,> Blowfish
> Serpent
> Twofish
> CAST5
> IDEA
Eny Asymmertric algorithms. > Elliptic curve
> RSA
> Diffie-Hellman
> DSA
> Key serialization
> ELGAMAL
What is a hash collision? A Hash Collision Attack is an attempt to find two input strings
of a hash function that produce the same hash result.
Because hash functions have infinite input length and a predefined output length, there is
inevitably going to be the possibility of two different inputs that produce the same output hash.
, What is Ipsec. Internet Protocol Security (IPsec) is a secure network protocol suite that
authenticates and encrypts the packets of data sent over an Internet Protocol network.
What are two modes of operation for IPsec. Host-to-Host and Tunnelling mode.
What does IKE stand for? Internet Key Exchange
What does the linux file permission of 777 mean everyone(owner, group, users) has read
write and excuate of the file.
What is the definition of ACL? Access control list.
Common tool used on Microsoft operating system for managing process. Task Manager.
Where is the SAM file located? C:\Windows\System32\drivers\etc\lmhosts.sam
What is an AS system. autonomous system
