15. A cryptographic hash function is used for: a. MAC. b. Compression. c. Digital Routing. d. Fragmentation. 16. How many possible keys are there for a 64 bit key ? a. 64 b. 2^64 c. 6412 d.2*64 17....

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Extracted text: 15. A cryptographic hash function is used for: a. MAC. b. Compression. c. Digital Routing. d. Fragmentation. 16. How many possible keys are there for a 64 bit key ? a. 64 b. 2^64 c. 6412 d.2*64 17. which of the following encryption algorithms is asymmetric ? a. DES b. OTP c. IDEA d. RSA 18. Which of the following is primarily a concem of digital signatures? a. secrecy b. authentication c. nonrepudiation d. integrity control 19. Public key ciphers are generally NOT derived from. a. prime numbers b. Ceasar shifting C. modulo math d. discrete logarithms 20. Which of the following protocols can provide secure remote connections to hosts? a. TLS b. SSH C. SCP d. IPSec e. SFTP 21. Which of the following authentication protocols would NOT typically be used over PPP? a. CHAP b. EAP c. PAP d. Kerberos