Meet in the Middle
Naively applying a block cipher twice under two independent keys does not give you twice the security. Given a known plaintext and ciphertext pair, compute forward from the plaintext, backward from the ciphertext, and match in the middle. For two independent k-bit keys that costs about 2^(k+1) cipher evaluations and 2^k stored intermediates, not the 2^(2k) the key length suggests. About one extra bit, bought with an enormous amount of storage.
More details
- 100% organic ring-spun cotton
- Midweight fabric (5.3 oz)
- Regular fit
- Unisex sizing
EU GPSR Product Information:
- Manufacturer contact information
- Name: Encryptorium
- Email: contact@support.shop.encryptorium.com
- Postal address: PO Box 5696 Santa Monica, CA 90405
- Additional information: This product is made for adults. Meets the EU REACH requirements. 2 year warranty in EEA and UK, established by Directive 1999/44/EC.
Quality Guarantee & Returns
- Quality is guaranteed. If there is a print error or visible quality issue, we'll replace or refund it.
- Because the products are made to order, we do not accept general returns or sizing-related returns.
Meet in the Middle Size Guide
| Size label | Length | Width | Sleeve length |
|---|---|---|---|
|
S
|
27.17
|
19.49
|
8.86
|
|
M
|
28.74
|
216
|
9.45
|
|
L
|
29.53
|
22.24
|
9.65
|
|
XL
|
30.31
|
23.43
|
9.84
|
|
2XL
|
31.1
|
25
|
104
|
|
3XL
|
31.89
|
26.57
|
10.24
|
|
4XL
|
32.68
|
28.54
|
10.24
|
|
5XL
|
337
|
30.51
|
10.24
|
