Corrected Block TEA by Needham and Wheeler with variable block sizes and enhanced security over TEA/XTEA. Supports blocks from 8 bytes to 1KB with 128-bit keys and improved diffusion.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Intermediate |
| Inventor | Roger Needham, David Wheeler |
| Year | 1998 |
| Origin | 🇬🇧 United Kingdom |
| Source | algorithms/block/xxtea.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 16 bytes (128 bits) |
| Block sizes | 8 bytes (64 bits) to 1024 bytes (8192 bits) in steps of 4 bytes |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Limited standardization | Not widely standardized or analyzed compared to modern ciphers | Use standardized ciphers like AES for production security applications |
| Variable block complexity | Variable block sizes may introduce implementation complexities and edge cases | Careful implementation and testing required for security-critical applications |
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — XXTEA 8-byte block - all zeros
| Field | Value |
|---|---|
key |
00000000000000000000000000000000 |
input |
0000000000000000 |
expected |
ab043705808c5d57 |
Vector 2 — XXTEA 8-byte block - mixed key
| Field | Value |
|---|---|
key |
0102040810204080fffefcf8f0e0c080 |
input |
0000000000000000 |
expected |
d1e78be2c746728a |
Vector 3 — XXTEA 8-byte block - all ones plaintext
| Field | Value |
|---|---|
key |
9e3779b99b9773e9b979379e6b695156 |
input |
ffffffffffffffff |
expected |
67ed0ea8e8973fc5 |