$I{D}_X$	The identity of $X$
$Cer{t}_X$	The certificate of $X$
$p$	A k-bit prime number
$F\left(p\right)$	Finite group $p$
$E$	The elliptic curve defined on finite group $p$
$G$	A generating point based on $E$
$b$	An integer $b$ with $2^{b-1}>p$
$h_i$	The $i$th bit of the hash value
$n$	An integer $n$ with $3\le n\le b$
$(d_X,Q_X)$	The EdDSA private key and public key of $X$
$\left(R_X,S_X\right)$	The EdDSA signature of $X$
$(p{k}_X,s{k}_X)$	The public key and private key of $X$
$M_{X-Y}$	The message from $X$$\mathrm{to} Y$
$En{c}_{p{k}_X}\left(M\right)$	Encrypted the message M with the public key of $X$
$De{c}_{s{k}_X}\left(M\right)$	Decrypted the message M with the private key of $X$
$H()$	One-way hash function
$r_X$	The random value of $X$ based on $E$
$T_X$	Timestamp message of $X$
$△T$	The threshold for checking the validity of timestamps
$A\stackrel{?}{=}B$	Verify whether A is equal to B