Adversaries may employ a known symmetric encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Symmetric encryption algorithms use the same key for plaintext encryption and ciphertext decryption. Common symmetric encryption algorithms include AES, DES, 3DES, Blowfish, and RC4.^[1],[2]

References

1. John Berti. (2026, July 1). Symmetric Cryptography: A CISSP Exam Study Guide. Retrieved September 2, 2026.
2. Keyfactor. (2026, July 22). Symmetric vs Asymmetric Cryptography: What’s the Difference and When to Use Each. Retrieved September 2, 2026.

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