Covert Communication Scheme Based on Bitcoin Transaction Mechanism

Table 3

Experimental parameters (Experiment 1).

Notations	Description	Content	Length
K	Key	0x77832f538aaaf37568d33979dafdaa680320beeaff668d1f6f92909b04584b9d	256 bits
k	Symmetric key	0x64306534323833336335646664353437	128 bits
m	Secret information	Blockchain	80 bits
c	Secret information ciphertext	0x8457d9399440782f6fa421fd542e7d10	128 bits
r	Random number	0xf0a1b49d	32 bits
Hash_Pks	Special public key hash	0x8457d9399440782f6fa421fd542e7d10f0a1b49d	160 bits
As	Special address (as output address)	1D4mS9QBj8TwVxJjSUSVGrZVr2GFnU3EHa	34 bytes
AK	The address generated with the key K as the private key (as the input address)	16kETg9eyFCGXddjZJkBb6LjAGXXP3oSTt	34 bytes
ID_Ts	The ID of special transaction	0x35b1b6dd6eecd67716beb4eec02c9fe0305b047f57a99d7c1d4ce4a869059c5f	64 bytes