The University of SydneyPage 27The language of cryptography
mplaintext message -a comprehensible form KAkey –secret knowledgeKA(m) ciphertext, encrypted with key -an incomprehensible form m = KB(KA(m))Cryptography protects from interruption, modification and fabrication plaintextplaintextciphertextKA
encryptionalgorithmdecryption algorithmAlice’s encryptionkeyBob’s decryptionkey
KB