Implementing Cryptography • Cryptography that is improperly applied can lead to vulnerabilities • It is essential to understand the different options that relate to cryptography • Implementing cryptography includes understanding: • Key strength • Secret algorithms • Block cipher modes of operation • Cryptographic service providers • The use of algorithm input values Key Strength (1 of 2) • Cryptographic key • A value that serves as input to an algorithm • Transforms plaintext into ciphertext (and vice versa for decryption) • Three primary characteristics that determine the resiliency of the key to attacks (called key strength) • Randomness • Length of the key • Cryptoperiod – length of time for which a key is authorized for use

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