### Clue 1

Solving this is a matter of frequency...

### Clue 2

After careful analysis, you'll see that you have everything you need.

### Solution

This message is a substitution cipher, meant to be solved via frequency analysis. This can be done from the ground up, or can be done using the letters and numbers on the front of the card. These letters and numbers correspond to the letter frequency of the plaintext message. The message is signed 'Anna Eve Massam'

### Clue 3

How many times do you count Q? Does that number appear elsewhere?

### Clue 4

Once you've correlated your key, it's a simple matter of translation.

### Clue 1

Solving this is a matter of frequency...

### Clue 2

After careful analysis, you'll see that you have everything you need.

### Solution

This message is a substitution cipher, meant to be solved via frequency analysis. This can be done from the ground up, or can be done using the letters and numbers on the front of the card. These letters and numbers correspond to the letter frequency of the plaintext message. The message is signed 'Anna Eve Massam'

### Clue 3

How many times do you count Q? Does that number appear elsewhere?

### Clue 4

Once you've correlated your key, it's a simple matter of translation.

### Clue 1

Mirror images...

### Clue 2

With careful reflection you can progress...

### Solution

Each stamp has two digits, and depicts a mirror. To find the date you need, invert each pair of digits. So, 41 becomes 14 and 14 becomes 41, to yield the full date of '1441'

### Clue 3

The signature on the message follows this same pattern...

### Clue 4

Forwards, backwards, makes no difference...

### Clue 5

dnuora ti nrut.