CAB240 Lecture Notes - Lecture 8: Disk Encryption, Plaintext, Ciphertext
Document Summary
Stenography is not cryptography: doesn"t typically use a key, thought nowadays can incorporate cryptography. When is cryptography used: historically in military and spy agencies, modern use is in, banking - eftpos. Internet - https protected by ssl/tls: wireless networking - ieee 802. 11 protects this, telephony: mobile phone conversations, disk encryption: bitlocker on windows, etc. For particular types of ciphers you need to understand the intended uses and the limitations (i. e. the right tool for the right job): cryptographic mechanisms can provide, confidentiality, data not disclosed to anyone not authorised to access it. Ciphers are used to deliver confidentiality services for information which is either: In storage: if you can"t prevent unauthorised access to data files, then encrypting the files can prevent unauthorised access. Bitlocker: being transmitted: information sent over network communication links can be encrypted to prevent eavesdroppers gaining unauthorised access to information.
