mirror of
https://github.com/hakavlad/tird.git
synced 2025-12-22 06:27:06 +00:00
Update docs
This commit is contained in:
Alexey Avramov
@@ -31,4 +31,8 @@
|
||||
<a href="https://github.com/hakavlad/tird/blob/main/docs/tutorial/writing_iso_image.md">Creating a Bootable USB Drive from an ISO Image</a>
|
||||
</b></td></tr>
|
||||
|
||||
<tr><td>➤</td><td><b>
|
||||
<a href="https://github.com/hakavlad/tird/blob/main/docs/tutorial/TLE.md">Time-Lock Encryption</a>
|
||||
</b></td></tr>
|
||||
|
||||
</table>
|
||||
|
||||
@@ -13,25 +13,119 @@
|
||||
|
||||
# Time-Lock Encryption
|
||||
|
||||
> [!NOTE]
|
||||
> `Time cost` value MUST be an integer.
|
||||
|
||||
Here's how to find the `Time cost` value at which keys are derived with Argon2 within a given time.
|
||||
|
||||
First, you need to determine the average time of a single Argon2 pass (iteration) on your hardware.
|
||||
|
||||
Try encrypting or decrypting a file.
|
||||
|
||||
For example, create an empty file named `0` and encrypt it with `Time cost` = 100.
|
||||
|
||||
Open the custom options, set `Time cost:` 100, and encrypt file `0`.
|
||||
|
||||
```
|
||||
$ touch 0
|
||||
$ tird
|
||||
|
||||
MENU
|
||||
———————————————————————————————————————————
|
||||
0. Exit 1. Info & Warnings
|
||||
2. Encrypt 3. Decrypt
|
||||
4. Embed 5. Extract
|
||||
6. Encrypt & Embed 7. Extract & Decrypt
|
||||
8. Create w/ Random 9. Overwrite w/ Random
|
||||
———————————————————————————————————————————
|
||||
A0. Select an option [0-9]: 2
|
||||
I: action #2:
|
||||
encrypt file contents and comments;
|
||||
write cryptoblob to new file
|
||||
C0. Use custom settings? (Y/N, default=N): y
|
||||
I: use custom settings: True
|
||||
W: decryption will require the same [C1] and [C2] values!
|
||||
C1. Time cost (default=4): 100
|
||||
I: time cost: 100
|
||||
C2. Max padding size, % (default=20):
|
||||
I: max padding size, %: 20
|
||||
C3. Set fake MAC tag? (Y/N, default=N):
|
||||
I: set fake MAC tag: False
|
||||
D1. File to encrypt: 0
|
||||
I: path: '0'; size: 0 B
|
||||
D2. Comments (optional, up to 512 B):
|
||||
I: comments will be shown as [None]
|
||||
D3. Output (encrypted) file: test1
|
||||
I: new empty file 'test1' created
|
||||
K1. Keyfile path (optional):
|
||||
K2. Passphrase (optional):
|
||||
W: no keyfile or passphrase specified!
|
||||
I: deriving keys (time-consuming)
|
||||
I: keys derived in 87.4s (1m 27.4s)
|
||||
I: data size to write: 899 B
|
||||
I: reading plaintext, writing cryptoblob
|
||||
I: written 100.0%; 899 B in 0.0s; avg 0.2 MiB/s
|
||||
I: writing completed; total of 899 B written
|
||||
I: pockets (padding) location in output file:
|
||||
[16:159] — 143 B
|
||||
[703:883] — 180 B
|
||||
I: action completed
|
||||
```
|
||||
|
||||
Here we specified the number of Argon2 iterations (`Time cost`):
|
||||
|
||||
```
|
||||
C1. Time cost (default=4): 100
|
||||
I: time cost: 100
|
||||
```
|
||||
|
||||
Here we obtained the Argon2 runtime in seconds:
|
||||
|
||||
```
|
||||
I: deriving keys (time-consuming)
|
||||
I: keys derived in 87.4s (1m 27.4s)
|
||||
```
|
||||
|
||||
Find the average time for one pass by dividing total time by the number of iterations:
|
||||
|
||||
```
|
||||
t_avg = 87.4 / 100 = 0.874
|
||||
```
|
||||
|
||||
So, on my hardware the average time for one iteration was **0.874** seconds.
|
||||
|
||||
### How to find `Time cost` for a given time interval?
|
||||
|
||||
Multiply `t_avg` by the number of seconds in the interval and round to get an integer.
|
||||
|
||||
For one hour:
|
||||
|
||||
```
|
||||
t_cost = t_avg * 3600 = 0.874 * 3600 = 3146.4 ≈ 3146
|
||||
```
|
||||
|
||||
Thus, `Time cost` = 3146 will make Argon2 run for about one hour on my hardware.
|
||||
|
||||
**Note:** speed can vary depending on CPU and memory load. This is an approximate value.
|
||||
|
||||
For two days:
|
||||
|
||||
```
|
||||
t_cost = t_avg * 3600 * 24 * 2 = 0.874 * 3600 * 24 * 2 = 151027.2 ≈ 151027
|
||||
```
|
||||
|
||||
**Note:** Measured times may vary with system load; re-run the short benchmark (e.g., `Time cost`=100) a few times and average the results for better accuracy.
|
||||
|
||||
### Approximate `Time cost` for different durations and example `t_avg` values
|
||||
|
||||
|
||||
|
||||
|
||||
|Time|`Time cost`<br>for<br>`t_avg=0.5`|`Time cost`<br>for<br>`t_avg=1`|`Time cost`<br>for<br>`t_avg=1.5`|`Time cost`<br>for<br>`t_avg=2`|`Time cost`<br>for<br>`t_avg=3`|`Time cost`<br>for<br>`t_avg=4`|
|
||||
|Time|`Time cost`<br>(`t_avg=0.5`)|`Time cost`<br>(`t_avg=1`)|`Time cost`<br>(`t_avg=1.5`)|`Time cost`<br>(`t_avg=2`)|`Time cost`<br>(`t_avg=3`)|`Time cost`<br>(`t_avg=4`)|
|
||||
|-|-|-|-|-|-|-|
|
||||
|10s|5|10|15|20|30|40|
|
||||
|1m (60s)|30|60|90|120|180|240|
|
||||
10m (600s)|300|600|900|1200|1800|2400|
|
||||
|10m (600s)|300|600|900|1200|1800|2400|
|
||||
|1h (3600s)|1800|3600|5400|7200|10800|14400|
|
||||
|6h (21600s)|10800|21600|32400|43200|64800|86400|
|
||||
|1d (24h, 86400s)|43200|86400|129600|172800|259200|345600|
|
||||
|7d (168h, 604800s)|302400|604800|907200|1209600|1814400|2419200|
|
||||
|30d (720h, 2592000s)|1296000|2592000|3888000|5184000|7776000|10368000|
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user