A penetration tester has written an application that performs a bit-by-bit XOR 0xFF operation on binaries prior to transmission over untrusted media. Which of the following BEST describes the action…

Hashing is a one-way deterministic function that produces a fixed-length digest and cannot be reversed to recover the original data, which is fundamentally different from an invertible XOR operation.

Key exchange refers to a cryptographic protocol (e.g., Diffie-Hellman) used to securely negotiate a shared secret between parties, not a transformation applied to binary data before transmission.

Encryption requires a recognized cryptographic algorithm (e.g., AES, RSA) with proper key management to ensure confidentiality; XOR with a fixed, publicly known constant like 0xFF provides no cryptographic security and does not qualify as encryption.

XOR-ing every byte with the static value 0xFF (which simply inverts all bits) provides no cryptographic strength, no key management, and is trivially reversible by any observer who knows the fixed operand. Because it only disguises the data without providing confidentiality guarantees of a recognized cipher, it is classified as obfuscation - a technique that makes data harder to read but does not constitute secure encryption.