What encryption algorithm can be used for both

What encryption algorithm can be used for both encryption and digital signing, uses a one-way function, and is still
widely used in e-commerce?
Select one:
a.
RSA
b.
DES
c.
AES
d.
ECC

Question 9
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What encryption algorithm is efficient requiring few resources, and is based on complex algebra and calculations on
curves?
Select one:
Question 10
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What type of attack is being attempted when an attacker uses a password-cracking program to guess passwords by
attempting every possible combination of letters?
Select one:

Question 11
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What type of attack is being conducted when the attacker has messages in both encrypted form and decrypted forms?
Select one:
Question 12
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