Knowledge in Computer Security & Cryptography
MAGNETISM AND SUPERCONDCTIVITY PHY
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kajjapu manikanta
QUANTUM MECH IN PHY ENGG
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SEMICONDICTORS PHY ENGG
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LASERS IN PHY ENGG EXAM
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FIBER OPTICS FOR ENGG
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DI ELECTRICS IN PHY EXAM
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NANO TECH IN PHY ENGG
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NUCLEAR TECH IN PHY ENGG
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Difference between block cipher and stream cipher
Stream cipher algorithm :it must follow XOR. The plain text is encrypted by 1 byte at a time. A stream cipher is a symmetric key cipher. Where a plain text digits are combined with a pseudo random cipher digits stream(key stream), in a stream cipher each plain text digit is encrypted 1 at a time with the corresponding digits of the key stream to give digits of the cipher text stream. Block cipher:block cipher operates on large block of digits with a fixed size. It follows XOR logic .block cipher techniques involves encryption of one block of text at a time. Decryption also takes one block of encrypted text at a time.
Divyareddy Junuthula
Difference between AES and DES
DES stands for data encryption standards . DES is a systematic key block cipher published by National Institute of Standards and technology. AES stands for Advanced Encryption standards. It is 6 times faster than DES.
SECURITY ATTACKS, SERVICES, MECHANISMS.
To assess the security needs of an organization effectively, the manager responsible for security needs some systematic way of defining the requirements for security and characterization of approches to satisfy those requirement one Approach is to consider three aspects of information security. 1.security attacks. 2.security mechanism. 3.security service.
Classification of Security services
The classification of Security services are as follows 1. Confidentiality. 2.authentication 3. Integrity. 4. Non repudiation. 5. Access control 6.availability.