Fundamentals of Encryption

What is a digital signature?

A piece of encrypted data added to other data to verify the sender

Which of the following uses key sizes equal to 128, 192 and 256 bits?

AES

Blowfish is an asymmetric stream cipher

False

Which hashing algorithm do modern Windows systems use?

NTLM

Secure Multipurpose Internet Mail Extensions (S/MIME) use X.509 certificates to secure e-mail communication

True

Which encryption algorithm uses a variable length symmetric key?

Blowfish

Which of the following is a symmetric key system using blocks?

DES

What is the purpose of a certificate?

To validate the sender of a digital signature or software

Which of the following is an encryption method developed by three mathematicians?

RSA

Which of the following encryption algorithms is a block cipher and uses the Rijndael algorithm?

AES