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Chapter 7 Credential, Access Control Protection domain A set of <resource, right> pains, Credentials Requests to access resources must be accompanied by credentials Evidence for the requesting principals'sright to access the resource. Simplest case: an identtiy cerificate for the principal, signed by the principal. Credentials can be used in combination to send an authenticated email., Evidence for the requesting principals'sright to access the resource. Simplest case: an identtiy cerificate for the principal, signed by the principal. Credentials can be used in combination to send an authenticated email. The speaks for idea We don't want users to have to give their password every time their PC accesses a server holding protected resoruces, Encryption Basics includes Encoding data using a key. Original data is referred to as plaintext or cleartext. Encrypted data is referred to as ciphertext. A computationally secure algorithm cannot be broken by systematic analysis with available resources, Access Control Two main approaches to implementaion: Access control list (ACL) associated with each object. Capabilities associated with principals, Cetificates require An agreed standard format. Agreement on the construction of chains of trust. Expiry dates, so that certificates can be revoked, Cetificates definition A statement signed by an apporpriate authority.