Two-Track MAC using dual RIPEMD-160 compression functions. Provides 160-bit authentication tags with 160-bit keys. Based on NESSIE submission.
| Property | Value |
|---|---|
| Category | Message Authentication |
| Sub-category | Iterated MAC |
| Security status | Not classified |
| Complexity | Intermediate |
| Inventor | Kevin Springle |
| Year | 2000 |
| Origin | 🇺🇸 United States |
| Source | algorithms/mac/ttmac.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 20 bytes (160 bits) |
| MAC sizes | 20 bytes (160 bits) |
| Flag | Value |
|---|---|
NeedsKey |
Yes |
Status: not classified — treat as unverified.
No vulnerabilities are recorded for this implementation.
8 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — TTMAC: Empty message (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
(empty) |
expected |
2dec8ed4a0fd712ed9fbf2ab466ec2df21215e4a |
Vector 2 — TTMAC: ‘a’ (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
61 |
expected |
5893e3e6e306704dd77ad6e6ed432cde321a7756 |
Vector 3 — TTMAC: ‘abc’ (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
616263 |
expected |
70bfd1029797a5c16da5b557a1f0b2779b78497e |
Vector 4 — TTMAC: ‘message digest’ (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
6d65737361676520646967657374 |
expected |
8289f4f19ffe4f2af737de4bd71c829d93a972fa |
Vector 5 — TTMAC: alphabet, 26 bytes (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
6162636465666768696a6b6c6d6e6f707172737475767778797a |
expected |
2186ca09c5533198b7371f245273504ca92bae60 |
Vector 6 — TTMAC: 56 bytes, padding spills into a second block (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
61626364626364656364656664656667 65666768666768696768696a68696a6b 696a6b6c6a6b6c6d6b6c6d6e6c6d6e6f 6d6e6f706e6f7071 |
expected |
8a7bf77aef62a2578497a27c0d6518a429e7c14d |
Vector 7 — TTMAC: 62 bytes, padding spills into a second block (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
4142434445464748494a4b4c4d4e4f50 5152535455565758595a616263646566 6768696a6b6c6d6e6f70717273747576 7778797a30313233343536373839 |
expected |
54bac392a886806d169556fcbb6789b54fb364fb |
Vector 8 — TTMAC: 8 x ‘1234567890’, 80 bytes over two blocks (NESSIE)
| Field | Value |
|---|---|
key |
00112233445566778899aabbccddeeff01234567 |
input |
31323334353637383930313233343536 37383930313233343536373839303132 33343536373839303132333435363738 39303132333435363738393031323334 35363738393031323334353637383930 |
expected |
0ced2c9f8f0d9d03981ab5c8184bac43dd54c484 |