| Property | Value |
|---|
| Date Sent | April 20, 1970 |
| Length | 13 characters |
| Header | "My name is—" |
Z13 — ENCRYPTED (13 columns × 1 row)
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
|---|
| 1. | A | E | N | ⊕ | ⑧ | K | ⑧ | M | ⑧ | ⚓ | N | A | M | 1. |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
Z13 — DECRYPTED (13 columns × 1 row)
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
|---|
| 1. | A | E | N | D | L | S | L | M | L | C | N | A | M | 1. |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
Bold letters are decoded from symbols
Z13 Symbol Key
| Symbol | Name | Position(s) | Decodes To | Verification |
|---|
| ⊕ | Crosshairs (Zodiac signature) | 4 | D | Z408: 4/4 = 100% |
| ⑧ | Eight-ball / Circled 8 | 5, 7, 9 | L | Math derived (only solution) |
| ⚓ | Anchor | 10 | C | Cross-cipher verified |
| K | Letter K | 6 | S | Z408: 5/5 = 100% |
Complete Decode Table
| Pos | Cipher | Decoded | Value | Source | Verification |
|---|
| 1 | A | A | 0 | Plain letter | — |
| 2 | E | E | 4 | Plain letter | — |
| 3 | N | N | 13 | Plain letter | — |
| 4 | ⊕ | D | 3 | Z408 verified | 4/4 locations = 100% |
| 5 | ⑧ | L | 11 | Math derived | Only value giving checksum 6 |
| 6 | K | S | 18 | Z408 verified | K→S: 5/5 locations = 100% |
| 7 | ⑧ | L | 11 | Math derived | Only value giving checksum 6 |
| 8 | M | M | 12 | Plain letter | — |
| 9 | ⑧ | L | 11 | Math derived | Only value giving checksum 6 |
| 10 | ⚓ | C | 2 | Cross-cipher | Z340, Z32, Z13 all = C |
| 11 | N | N | 13 | Plain letter | — |
| 12 | A | A | 0 | Plain letter | — |
| 13 | M | M | 12 | Plain letter | — |
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