a simple rotation cipher such as
A=C
B=D
C=E
F
E=G
F=H
G=I
H=J
I=K
J=L
K=M
L=N
M=O
N=P
O=Q
P=R
Q=S
R=T
S=U
T=V
U=W
V=X
W=Y
X=Z
Y=A
Z=B

Another way is using numbers
1=B
2=C
3=D
4=E
5=F
6=G
7=H
8=I
9=J
01=K
02=L
03=M
04=N
05=O
06=P
07=Q
08=R
09=S
11=T
12=U
13=V
14=W
15=X
16=Y
17=Z

JMTC KW GACB DGLEP

78 0316 0418034 809 1051

Both can be cracked quite easily in a day but for the cipher to work you change the rotation number daily so instead of A=C A=F OR Instead of 1=B 1=W Or to Make it harder A=CAB and CAB=1 Which mean 1=B the way that wqork you choose 2 letters closet to the old letters so E=DEF and the letter in the middle would corrrespond to number below it or multiple letters below it depending on your rotation number