CISSP-ISSAP: Information Systems Security Architecture Professional

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QuestionQ122

VerifiedInfrastructure and System Security

You are the Security Administrator for a consulting firm. A client needs to encrypt traffic but has specific requirements for the encryption algorithm: it must be a symmetric-key block cipher. Which of the following should you select for this client?

Explanation

DES is a symmetric-key block cipher: it encrypts fixed-size data blocks with the same secret key used for encryption and decryption. RC4 is a stream cipher, and PGP and SSH are not block-cipher algorithms.

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