Method-IOBehavior.md

Cryptography Methods Classification

Primary Category	Sub-Category / Type	Algorithms / Methods
Symmetric Key Cryptography	Block Ciphers	AES, DES, 3DES, Blowfish, Twofish, IDEA, Camellia, Serpent, RC2, RC5, RC6, CAST-128, SEED, ARIA, SM4, Magma, Kuznyechik (GOST)
	Block Cipher Modes	ECB, CBC, CFB, OFB, CTR, GCM, CCM, XTS
	Stream Ciphers	RC4, Salsa20, ChaCha20, HC-128, Rabbit, SOSEMANUK, A5/1
Asymmetric Key Cryptography	Public Key Encryption	RSA, ElGamal, Rabin, Paillier
	Key Exchange	Diffie-Hellman (DH), ECDH, X25519, MQV
	Elliptic Curve Cryptography (ECC)	ECDSA, ECDH, Ed25519, Ed448, Curve25519, SM2
	Digital Signature Algorithms	RSA Signature, DSA, ECDSA, EdDSA, Schnorr, BLS
Cryptographic Hash Functions	Hash Algorithms	MD5, SHA-1, SHA-2 (224/256/384/512), SHA-3 (Keccak), BLAKE2, BLAKE3, RIPEMD-160, Whirlpool, Tiger
Message Authentication	MAC Algorithms	HMAC (SHA-256 / SHA-3), CMAC, GMAC, Poly1305
Authenticated Encryption (AEAD)	Integrated Encryption + Integrity	AES-GCM, AES-CCM, ChaCha20-Poly1305, AES-OCB
Post-Quantum Cryptography (PQC)	Key Encapsulation / Encryption	CRYSTALS-Kyber (ML-KEM), NTRU, Classic McEliece, FrodoKEM
	Post-Quantum Signatures	CRYSTALS-Dilithium (ML-DSA), Falcon, SPHINCS+ (SLH-DSA)
Advanced Cryptography	Zero-Knowledge Proofs	Schnorr ZKP, Sigma Protocols, zk-SNARKs, zk-STARKs (overview)
	Homomorphic Encryption	Paillier (additive / PHE), BFV / CKKS (FHE concepts)
	Secure Computation	Yao's Garbled Circuits, GMW Protocol, Oblivious Transfer (OT)
	Secret Sharing	Shamir's Secret Sharing (SSSS), Blakley's Scheme
Classical / Historical Ciphers	Traditional Ciphers (Insecure Today)	Caesar, Vigenere, Playfair, Hill Cipher (Matrix), Enigma Machine
Cryptographic Protocols (Built Using Above Methods)	Secure Communication Protocols	TLS 1.3, SSH-2, IPsec IKEv2, PGP / OpenPGP, Kerberos

Cryptographic Input-Output Behavior

Category	Input	Output	Reversible?
Symmetric Encryption	Plaintext + Key [+ IV/Nonce]	Ciphertext	Yes (with key)
Asymmetric Encryption	Plaintext + Public Key	Ciphertext	Yes (with private key)
Authenticated Encryption (AEAD)	Plaintext + Key + Nonce [+ AAD]	Ciphertext + Auth Tag	Yes (key + tag verify)
Hash Function	Message (any length)	Fixed-length digest	No (one-way)
Digital Signature	Message + Private Key	Signature	No (verify only)
Signature Verification	Message + Signature + Public Key	Valid / Invalid	N/A
MAC (Message Authentication)	Message + Symmetric Key	MAC Tag	No (verify only)
Key Exchange (DH / ECDH)	Own private key + Peer public key	Shared Secret	No (not decryption)
Key Encapsulation (KEM/PQC)	Recipient public key	Ciphertext + Shared Secret	Yes (with private key)
Zero-Knowledge Proof	Statement + Witness (secret)	Proof transcript	No (verify only)
Secret Sharing	Secret + (n, k) threshold params	n Shares	Yes (with k shares)
Homomorphic Encryption	Plaintext + Public Key	Encrypted operand	Yes (with private key)