"Hardware or software implementation of cryptography that contains all the necessary software, protocols, algorithms, and keys." (Adam Gordon, "Official (ISC)2 Guide to the CISSP CBK" 4th Ed., 2015)
"The hardware or software implementation of cryptography." (Shon Harris & Fernando Maymi, "CISSP All-in-One Exam Guide" 8th Ed., 2018)
"A set of cryptographic algorithms together with the key management processes that support use of the algorithms in some application context." (William Stallings, "Effective Cybersecurity: A Guide to Using Best Practices and Standards", 2018)
"A cryptosystem includes a complete process of key generation, encryption, and decryption techniques for secure data communication over the insecure channel." (Shafali Agarwal, "Preserving Information Security Using Fractal-Based Cryptosystem", Handbook of Research on Cyber Crime and Information Privacy, 2021)
"Associated information security (INFOSEC) items interacting to provide a single means of encryption or decryption." (CNSSI 4009-2015)
[manual cryptosystem:] "Cryptosystem in which the cryptographic processes are performed without the use of crypto-equipment or auto-manual devices." (CNSSI 4009-2015)
[online cryptosystem:] "Cryptographic system in which encryption and decryption are performed in association with the transmitting and receiving functions." (CNSSI 4009-2015)
[off-line cryptosystem:] "Cryptographic system in which encryption and decryption are performed independently of the transmission and reception functions." (CNSSI 4009-2015)
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