Surprise Test

Cryptography is

• the art of encoding information in a format that

  only the intended recipients can decode.

• replete with object lessons on the design of secure systems, drawn from real-world situations and system security failures.

• used to provide proof of the authenticity of information, in a manner analogous to the use of signatures in conventional transactions.

• used to protect the integrity and privacy of information and other resources belonging to individuals and organizations is pervasive in both the physical and the digital world.

What is encryption?

• When you put data / text into code making it difficult to read or understand.
• A secret or disguised way of writing; a code.
• A formal language designed to communicate instructions to a machine
• What is put in, taken in, or operated on by any process or system.

What encryption algorithm uses the same pre-shared key to encrypt and decrypt data?

• hash

• one-time pad

• symmetric

• asymmetric

What encryption algorithm uses one key to encrypt data and a different key to decrypt data?

• symmetric

• transposition

• one-time pad

• asymmetric

Hacking refers to:

• Data access without permission

• Data updating without permission

• Data deletion without permission

• Data theft

What do you mean by a Digital Certificate?

1:verifying to a third party that a message or a document is an unaltered copy of one produced by the signer.

2.the data which has been digitally signed or encrypted by any private key can solely be decrypted by its identical public key

• 1 is true but not 2

• Both 1 and 2 are true

• Both 1 and 2 are false

• 2 is true but not 1

In the RSA public key cryptosystem, which one of the following numbers will always be largest?

• e

• n

• p

• q

Which term describes the technology that protects software from unauthorized access or modification?

• access control

• copyright

• watermarking

• trademark

What does 13 mod 126 look like using the Quotient Remainder Theorem?

• 13 = 126 * 0 + 13
• 126 = 13 * 9 + 9
• 13 =  126 * 0 + 13
• 13 = 126 + 13 

(M, {Digest(M)}K_Apriv)

• Alice encrypts the digest in her private key, appends it to M and makes the resulting signed document

• Bob encrypts the digest in her private key, appends it to M and makes the resulting signed document

• Alice decrypts the digest in her private key, appends it to M and makes the resulting signed document

• Sara encrypts the digest in her private key, appends it to M and makes the resulting signed document