98-372 · Question #68
98-372 Question #68: Real Exam Question with Answer & Explanation
The correct answer is C. Advanced Encryption Standard. The Advanced Encryption Standard (AES) is an encryption standard that comprises three block ciphers, AES-128, AES-192, and AES-256, adopted from a larger collection originally published as Rijndael. Each AES cipher has a 128-bit block size, with key sizes of 128, 192, and 256 bit
Question
Options
- AData Encryption Standard
- BTransparent data encryption
- CAdvanced Encryption Standard
- DInternational Data Encryption Algorithm
Explanation
The Advanced Encryption Standard (AES) is an encryption standard that comprises three block ciphers, AES-128, AES-192, and AES-256, adopted from a larger collection originally published as Rijndael. Each AES cipher has a 128-bit block size, with key sizes of 128, 192, and 256 bits, respectively. The AES ciphers have been analyzed extensively and are now used worldwide, as was the case with its predecessor, the Data Encryption Standard (DES).AES is one of the most popular algorithms used in symmetric key cryptography. It is available in many different encryption packages. AES is the first publicly accessible and open cipher approved by the NSA for top secret information. Answer: A is incorrect. The Data Encryption Standard (DES) is a block cipher (a form of shared secret encryption) that was selected by the National Bureau of Standards as an official Federal Information Processing Standard (FIPS) for the United States in 1976 and which has subsequently enjoyed widespread use internationally. It is based on a symmetric- key algorithm that uses a 56-bit key. The algorithm was initially controversial with classified design elements, a relatively short key length, and suspicions about a National Security Agency (NSA) backdoor. DES consequently came under intense academic scrutiny, which motivated the modern understanding of block ciphers and their cryptanalysis. Answer: D is incorrect. International Data Encryption Algorithm (IDEA) is a block cipher. It operates on 64-bit blocks using a 128-bit key. This algorithm was intended as a replacement for the Data Encryption Standard. IDEA was used in Pretty Good Privacy (PGP) v2.0, and was incorporated after the original cipher used in v1.0, BassOmatic, was found to be insecure. It is an optional algorithm in OpenPGP. The cipher is patented in a number of countries but is freely available for non-commercial use. IDEA is a minor revision of an earlier cipher, PES (Proposed Encryption Standard). It was originally called IPES (Improved PES). Answer: B is incorrect. Transparent data encryption (TDE) performs real-time I/O encryption and decryption of the log and data files. It makes use of a database encryption key (DEK), which is stored in the database boot record for availability during recovery. It gives the ability to abide by many laws, regulations, and guidelines established in various industries. This facilitates software developers to encrypt data by using AES and 3DES encryption algorithms without changing existing applications.
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