Inftroduction to Information system security

Information System Security
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(Confidentiality) (Integrity) (Availability) (Non-Repudiation)
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(Basic Security Measure)
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7
(External Security)
(Operational Security)
(Surveillance)
(Passwords and ID Systems)
(Auditing)
(Access Rights)
(Guarding Against Viruses)
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(External Security)
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(Operational Security)
(, , )
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(Surveillance)
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(Passwords and ID Systems)
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(Auditing)
Transaction Transaction Log File Transaction
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(Access Rights)
2
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(Guarding Against Viruses)
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Basic Encryption and Decryption Techniques
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(Cryptography) Plain text Encryption Algorithm Ciphertext Key
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How are you feeling today
HXEOWYLP 34ACJLKLO GDEABCQ.
Encryption Algorithm
Plain text
Key
Ciphertext
(Public Key Cryptography)
2
(Symmetric Cryptosystems) (Asymmetric Cryptosystems)
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(Public Key Cryptography)
(Symmetric Cryptosystems)
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Symmetric Encryption
(Cipher text)
Internet
(Cipher text)
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Symmetric Encryption
2
Authentication Non-repudiation
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(Public Key Cryptography)
(Asymmetric Cryptosystems) 2 (Public key) (Private key ) Public key Private Key
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Asymmetric Encryption
(Cipher text)
Internet
(Public Key)
(Cipher text)
( Private Key)
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Asymmetric Encryption
Authenticate
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