Computer Security Essay Example | Topics and Well Written Essays - 2000 words

Computer Security - Essay ExampleCharacteristics of the attacker Motivation The motivation is to view encrypted files within the especial(a) 9 days time frame after which the information loses relevance to the attacker. Access The attacker has only access to physical location of the workstation though the time is limited to only 43 minutes. Skills and risk aversion The attacker is risk averse and has idea on file encryption techniques. The attacker is not mindful of the profound and ethical ramifications of the operation but he is not willing to attain his goal through violent means. Basic Attack tree Possible attacks extra Equipment Required Attack tree against AES Goal Read a message encrypted with AES 1. Decrypt the message itself. (OR) 1.1. Break lopsided encryption.(OR) 1.1.1. Brute-force disrupts asymmetric encryption. (OR) 1.1.2. Mathematically break asymmetric encryption (OR) 1.1.2.1. Break RSA. (OR) 1.1.2.2. Factor RSA modulus/calculate AES discrete log. 1.1.3 Cryptanal yze asymmetric encryption 1.1.3.1. General cryptanalysis of RSA/ AES (OR) 1.1.3.2. Exploiting weakness in RSA/ AES. (OR) 1.1.3.3. Timing attacks on RSA/ AES. 1.2. Break symmetric- make out encryption. (OR) 1.2.1. Brute-force break symmetric-key encryption. (OR) 1.2.2. Cryptanalysis of symmetric-key encryption. 2. ... 2.1.3. Have the file encrypted with a different public key in the background unknown to the owner. 2.2. Have the owner sign the encrypted symmetric key. (OR) 2.3. superintend owners computer memory. (OR) 2.4. oversee other user back-up storage memory. (OR) 2.5. Determine the key from pseudorandom number generator. (OR) 2.5.1. Determine the state of randseed. Bin when the message was encrypted. (OR) 2.5.2. graft software (virus) that deterministically alters the state of randseed.bin. (OR) 2.5.3. Implant the software that directly affects the choice of symmetric key. 2.6. Implant a virus that exposes the symmetric key. 3. Get owner to (help) decrypt message. (OR) 3.1. chosen cipher text attack on symmetric key. (OR) 3.2. Chosen cipher text attack on public key. (OR) 3.3. Ghost the drives to an external storage medium. (OR) 3.4. Monitor outgoing data from the owners computers through the network. (OR) 3.5. Intercept transferable data through the network (OR) 3.6. Read decrypted intercepted file. 3.6.1. Copy the message from the owners hard drive or virtual memory. (OR) 3.6.2. Copy the files from back-up media (OR) 3.6.3. Monitor network traffic. (OR) 3.6.4. Use electromagnetic snooping techniques to read files as they are displayed on the screen (OR) 3.6.5. resume read message from print-out 4. Obtain head-to-head key from the owner 4.1. Factor RSA modulus/ calculate AES discrete log. (OR) 4.2. Get private key of owner. (OR) 4.2.1. Obtain encrypted owners private key ring. (OR) 4.2.1.1. Copy it from owners hard drive. (OR) 4.2.1.2. Copy it from disk backups. (OR) 4.2.1.3. Monitor network traffic. (OR) 4.2.1.4. Implant virus or worm to expose c opy of the encrypted private key. 4.2.2. Decrypt Private Key.