Cryptography Interview Questions
Questions Answers Views Company eMail

What is a digital certificate?

Cisco,

1 2611

What is a digital signature?

Cisco,

1 2879

What is the keystore?

Cisco,

1 2448

What is a message digest?

2 2288

What is a one-time-pad?

899

Are one-time pads really unbreakable?

729

What are good sources of randomness?

732

How to encrypt swap?

798

shall we use a journalling filesystem on top of /dev/loop?

906

How do I change the password / the cipher?

607

How to make backups?

1317

What are IP Tunnels?

914

what is CBC?

912

what is ECB?

996

Is ECB cipher mode faster than CBC ?

907



Un-Answered Questions { Cryptography }

What is cryptanalysis ?

606


What is a fail-stop signature scheme ?

1161


How to I prevent other users from using Kryptel (Silver Key)?

709


How large a key should be used in RSA ?

749


Explain zero-knowledge proofs?

386


what is CBC?

912


What is triple-DES ?

699


A company wants to transmit data over the telephone, but it is concerned that its phones may be tapped. All of its data is transmitted as four-digit integers. It has asked you to write a program that will encrypt its data so that the data may be transmitted more securely. Your script should read a four digit integer entered by the user in a prompt dialog and encrypt it as follows: Replace each digit by (the sum of that digit plus 7) modulus 10. Then swap the first digit with the third, and swap the second digit with the fourth. Then output XHTML text that displays the encrypted integer.

1758


What are pseudo-random generators?

151


How is RSA used for authentication and digital signatures in practice ?

768


What is secret splitting?

278


What is RSA ?

867


What are typical key spaces for symmetric and asymmetric ciphers?

1323


What is nonlinear cryptography?

4194


Is DES available in hardware?

810