Application

Question 1

SMTP (Simple Mail Transfer Protocol)

Answer 1

used for fowarding email messages

Question 2

POP (Post OFfice Protocol)

Answer 2

contacting your email service and downloading all of your new messages from it.

Question 3

IMAP (Internet Message Access Protocol)

Answer 3

allows you to access your email wherever you are, from any device.

Question 4

Process of One to Multiple Email

Answer 4

message generates a symmetric key and encrypts with all recipients public keys

when received the recipients extract the symmetric key and decrypt the message with symmetric key

Question 5

Process of One to One Email

Answer 5

Sender sends email to local MTA

MTA forwards email to another MTA

Receiver receives email

Question 6

Process of One to Distribution List Email

Answer 6

Exploder Server has public-private keys for every list

symmetric key is generated and email encrypted with exploder server public key

Email sent to Exploder server

Exploder decrypts using private key and obtains symmetric key

Exploder encrypts symmetric key with members public key

Exploder forwards message and symmetric key to recipients

Question 7

Symmetric Cryptosystem

Answer 7

Plaintext -> 
Recipient's public key (Encryption) -> 
Ciphertext -> 
Recipient's Private Key (Decryption) -> 
Original Plaintext

Question 8

Asymmetric Cryptosystem

Answer 8

□ Plaintext ->
Encryption key -> Ciphertext ->
Decryption key -> Original Plaintext

Question 9

Digital Signature

Answer 9

technique used to validate authenticity and integrity of message/digital doc

Question 10

Digital Certificate

Answer 10

electronic document that binds together a public-key with an identity and can be used to verify that a public key belongs to a particular person or entity

Question 11

Digital Certificate process

Answer 11

Bob sends his public key to Vera (Certificate Signing Request) (.csr)

Vera verifies that Bob “is who he says he is”

Vera “digitally signs” and returns it to Bob (SSL/TLS Certificate) (.crt)

Question 12

PGP (Pretty Good Privacy)

Answer 12

De-facto standard email encryption scheme for providing security services for email communication

Question 13

which of CIA does PGP have

Answer 13

Confidentiality and Integrity

Question 14

Security mechanism and components of PGP?

Answer 14

Hashing, Encryption, Compression, Formatting

Question 15

S/MIME

Answer 15

secure email standard

good option for security of non text content

centralized authority